| 单词 | ferrous |
| 例句 | Large ferrous appliances, such as the wheeled metal canisters for liquid nitrogen known as Dewar flasks, had to be chained in place. Big Science 2015-07-07T00:00:00Z “It will also soak up the blood of its targets, giving bloodswords their distinctive ferrous odor,” Erastis added helpfully, “and making for easy cleanup.” The Reader 2016-01-12T00:00:00Z Other cars were carrying two chemicals--sodium hydroxide and ferrous sulfate. Metra delays linger after freight derailment 2011-11-04T10:57:00Z Its ferrous, reddish-brown waters are a refreshing alternative to the sulfur baths that quickly tarnish silver jewelry. Journeys: In Taiwan, Steaming Pools of Paradise 2010-03-19T15:29:00Z This mirage of hovering planes, voids and shadows in sheets of cutout, darkly rusted ferrous iron is simultaneously a mask, a body and a musical instrument. Review: Picasso, Completely Himself in 3 Dimensions 2015-09-10T04:00:00Z I can’t say that you can absolutely taste the stout in it, but there is certainly a resonant, ferrous tang which I happen to love. The 20 best Nigella Lawson recipes: part 4 2017-03-30T04:00:00Z Existing evidence suggests supplements are a more effective way to replenish iron stores than dietary changes alone and ferrous sulfate is the most effective iron supplement for young children. Could my child have low iron? And what are my options if they do? 2023-09-13T04:00:00Z Profits dived for 28 of 41 major industrial sectors during the period, with the ferrous metal smelting and rolling processing industry reporting the deepest slump at 90.5%. China's industrial profits extend slump into seventh month 2023-08-27T04:00:00Z That led Magee and his colleagues to identify it as a chondrite, a meteorite made mostly of rock, in contrast to the iron and nickel composition of so-called iron or “ferrous” meteorites. A Meteorite Fell in Their Bedroom. Here’s What Happened Next 2023-05-25T04:00:00Z Conversely, Earth’s ferrous nucleus may have a metamorphosing surface, twisting any seismic waves that pierce it. Earth’s Inner Core Paused, Then Reversed Its Spin. This Is Fine. 2023-01-23T05:00:00Z Iron ore prices have come under increased pressure in recent months due to persistent demand worries from top steel producer China, with the country's zero-COVID policy curtailing economic activity and weighing on ferrous markets. Rio Tinto profit falls 29%, slashes dividend as iron ore prices ease 2022-07-27T04:00:00Z Russia was enraged when Lithuania banned the transit of steel and other ferrous metals under EU sanctions last month, and threatened to respond. Kaliningrad row: Lithuania resumes transporting goods to Russian exclave 2022-07-22T04:00:00Z That incident came a week after Russian officials threatened to retaliate because Lithuania restricted the transit of steel and ferrous metals sanctioned by the EU through its territory to Russia’s exclave of Kaliningrad. Cyberattack hits Norway, pro-Russian hacker group fingered 2022-06-29T04:00:00Z The incident came a week after Russian officials threatened to retaliate because Lithuania restricted the transit of steel and ferrous metals under EU sanctions. Cyberattack hits Lithuania after sanctions feud with Russia 2022-06-27T04:00:00Z When Lithuania banned the transit of steel and other ferrous metals under EU sanctions last Saturday, Russia threatened to respond. Kaliningrad row: Lithuania accuses Russia of lying about rail 'blockade' 2022-06-22T04:00:00Z Lithuania emphasized that the ban on the movement of sanctioned goods was part of the fourth package of EU sanctions against Russia, noting it only applies to steel and ferrous metals starting on June 17. EXPLAINER: Why Russia-Lithuania tensions are rising 2022-06-22T04:00:00Z Lithuania shut the route for transport of steel and other ferrous metals from mainland Russia on Friday, saying it had to do so under EU sanctions that took effect that day. Lithuania: We're ready if Russia cuts us out of common power grid over Kaliningrad disruptions 2022-06-22T04:00:00Z Photo by Sean Hollister / The Verge And, of course, you can attach them to all sorts of other ferrous metal objects and pay out just as much cable as you need. Tangle-free magnetic USB cables are here 2022-05-26T04:00:00Z Price gains slowed in annual terms in the oil and natural gas extraction, and ferrous and non-ferrous metal smelting and processing sectors, statistics agency’s Dong said. China's factory gate inflation slows, outlook dimmed by still-elevated prices 2021-07-09T04:00:00Z Apart from media, Kolomoisky owns multiple assets in Ukraine, including in oil and gas, ferrous metals and chemicals, agriculture and air transport. Zelenskiy’s victory in Ukraine was extraordinary. But now he faces a real test | Katya Gorchinskaya 2019-04-22T04:00:00Z Magnet fishing, for the uninitiated, is defined by various enthusiast websites as using a strong magnet to retrieve ferrous metal objects hidden or lost underwater. Man finds ‘authentic WWII hand grenade’ while magnet fishing in Florida: police 2019-01-26T05:00:00Z Adding to pressure on manufacturers, factory-gate prices fell sharply amid softer demand, hurting profitability for sectors from petroleum processing to ferrous metal smelting. China reports weakest factory growth in over two years on eve of... 2018-11-30T05:00:00Z And they would reduce US exports of ferrous metal products to the European Union, say, while increasing the supply and lowering the price of steel products in the United States. Consumption rebound could undermine border carbon-adjustment charges 2018-08-28T04:00:00Z Their cost of ferrous feedstock per ton of steel is $90 higher than the average in Brazil, Russia, Japan and China, according to analysts at Bernstein. Does American Steel Need More Protection? 2018-03-07T05:00:00Z Amused and enchanted, I named him "Ferrous" for the chemical name of rust, hydrated ferrous oxide. Some Songbirds Have Brains Specially Designed to Find Mates for Life 2018-02-13T05:00:00Z They said he provided or helped gain access to prescription-dose vitamin D; calcitonin; ferrous sulfate; Advair; testosterone; and various thyroid medications. ‘This Doesn’t Sound Legal’: Inside Nike’s Oregon Project 2017-05-19T04:00:00Z Examination of the chemistry of the tail where it was exposed at the surface of the amber even shows up traces of ferrous iron, a relic of the blood that was once in the sample. 'Beautiful' dinosaur tail found in amber - BBC News 2016-12-08T05:00:00Z Tea and coffee were adulterated with sand, chicory, and spent grounds treated in ferrous sulphate and sheep’s dung. A toxic web: what the Victorians can teach us about online abuse 2016-04-18T04:00:00Z Meanwhile, he said, the ferrous rotors were every bit as fade resistant. Cadillac CTS-V: The World’s Least Sedate Sedan? 2015-07-31T04:00:00Z The magnetometer is especially important because it locates ferrous objects. When Not Treasure Hunting, Pirates Practiced Democracy 2015-07-05T04:00:00Z “Nobody rips up money,” said the Vale North ferrous director, Paulo Horta. Another huge and open iron mine is carved out of Brazil’s rain forest 2015-04-13T04:00:00Z These seemingly inoffensive creatures are the bane of metal with a ferrous content, for as their name implies they have the effect of rust upon such substances, and this happens nearly instantaneously. The Rust Monster: A History And Preview From The Dungeons & Dragons Monster Manual 2014-09-16T04:00:00Z CME Group said this week that it plans to launch a U.S. steel scrap contract to expand its offering of ferrous derivatives, aiming to cash in on growing interest in price-risk management in the sector. Deutsche Bank abandons LME steel billet 2012-06-22T16:07:51Z Furthermore, Saase has endeavored to show that the ferrous salts possess the power of converting oxygen into ozone. A System of Practical Medicine by American Authors, Vol. I Volume 1: Pathology and General Diseases 2012-03-17T02:00:54.097Z Ferric oxide gives a yellow colour, but requires the presence of an oxidizing agent to prevent 87 reduction to the ferrous state. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 1 "Gichtel, Johann" to "Glory" 2012-01-11T03:00:20.463Z An entire planet of ferrous oxide—iron—steel for the already starving technology of the Western Alliance. We're Civilized! 2011-12-15T03:00:16.297Z Thus iron protoxide is now generally known as ferrous oxide, and iron peroxide as ferric oxide. Heroes of Science Chemists 2011-12-09T03:00:21.047Z From this last term comes the modern melanterite, native hydrous ferrous sulphate. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z The differences are surprisingly small and are principally an increase in the water and a diminution in the amount of alkalis and lime together with the oxidation of the ferrous oxide. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z By converting ferrous into ferric oxide the green tint is changed to yellow, which is less noticeable. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 1 "Gichtel, Johann" to "Glory" 2012-01-11T03:00:20.463Z Or Gutzkow’s method of precipitating the metal with ferrous sulphate may be employed. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2 "Gloss" to "Gordon, Charles George" 2011-10-31T02:00:28.703Z With ferric salts its solution gives a deep blue colour, and with ferrous salts, after exposure to the air, an insoluble, blue-black, ferroso-ferric gallate. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z In the Carboniferous rocks of Pennsylvania and neighbouring States to the south and west, layers of ferrous carbonate, formed when there was an excess of organic matter present, termed black-band ore and kidney ore, occur. North America 2011-05-05T02:00:20.027Z CMA, which processes and recycles secondary ferrous and nonferrous metal products, announced in February 2010 a voluntary suspension of its shares in order to restructure its finance facilities and look at ways to raise capital. KKR invests in Australia's CMA 2011-05-04T23:28:43Z Manganese dioxide not only acts as a source of oxygen, but develops a pink tint in the glass, which is complementary to and neutralizes the green colour due to ferrous oxide. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 1 "Gichtel, Johann" to "Glory" 2012-01-11T03:00:20.463Z Or the alloy is dissolved in aqua regia, the solution filtered from the insoluble silver chloride, and the gold precipitated by ferrous chloride. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2 "Gloss" to "Gordon, Charles George" 2011-10-31T02:00:28.703Z BHP ferrous and coal chief Marcus Randolph said the concession had been expected, and the profits tax on iron ore and coal mines had long been factored in the miner's plans. BHP outlines $9.5 billion expansion plans in iron ore, coal 2011-03-25T00:18:41Z When, under similar conditions, an excess of organic matter is present, beds of ferrous carbonate are formed. North America 2011-05-05T02:00:20.027Z The ferrous sulphate here employed is oxidized by the chromic acid to a ferric salt, which serves as a carrier of oxygen to the aniline. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z There are 87 such waste-to-energy plants in the United States and many, including Harrisburg's, also harvest ferrous metals from the trash to sell, bringing in much-needed revenue. Special report: The incinerator that may burn muni investors 2010-05-12T12:28:00Z Iron.—The methods used in the assay for iron are volumetric, and are all based on the property possessed by certain reagents of oxidizing iron from the ferrous to the ferric state. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" Calculate the value of the ferrous salt in terms of bichromate. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. Both ferrous carbonate and limonite, however, occur in irregular surface deposits. North America 2011-05-05T02:00:20.027Z Cotton is impregnated with ferrous acetate, dried, aged and fixed with silicate of soda, then dyed in a neutral bath. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z When the gelatine has set, we put the plate over a diagram, a hexagon for instance, and place a drop of ferrous sulphate solution at each of the six angles. The Mechanism of Life Ammonium ferrous sulphate may also be used; it contains one-seventh of its weight of iron. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" Only soluble ferric compounds seem to serve as a suitable source of supply of the element; ferrous compounds being usually highly toxic to plants. The Chemistry of Plant Life It is closed by an ornate clasp made of ferrous metal plated with brass. Bloodletting Instruments in the National Museum of History and Technology The lowest increases in employment occurred in the production of fuels, in ferrous metallurgy, and in the manufacture of glass and china. Area Handbook for Romania The bulk of industrial investment was channeled into heavy industry, including fuel and energy production, ferrous and nonferrous metallurgy, chemicals, and machine building and metalworking. Area Handbook for Bulgaria And then, incredibly, it rose from the ferrous sands and dashed off toward the east, a faint, disgustingly moist vapor trailing out behind it. Fair and Warmer It may also be accomplished by calcination with ferrous sulphate, or other easily decomposable sulphates, such as aluminium sulphate. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" The button release is made of ferrous metal plated with silver. Bloodletting Instruments in the National Museum of History and Technology It forms dark red crystals isomorphous with ferrous sulphate, and readily soluble in water. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" Industrial branches that experienced the most rapid growth in the 1960-71 period included ferrous metallurgy, chemicals and rubber, machine building and metalworking, and fuels. Area Handbook for Bulgaria CHROMITE, a member of the spinel group of minerals; an oxide of chromium and ferrous iron, FeCr2O4. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3 "Chitral" to "Cincinnati" This conversion is effected by allowing the ferrous chloride liquors slowly to descend a tower, filled with pieces of wood, coke or quartz, where it meets an ascending current of chlorine. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" The ferrous oxide is in part replaced by manganous oxide and lime, and in the closely allied and isomorphous species eosphorite manganese predominates over iron. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2 "Chicago, University of" to "Chiton" To obtain these the gold is first precipitated from the solution by ferrous chloride, all the other metals by iron turnings. The Galaxy, Volume 23, No. 2, February, 1877 Particularly if these are stony meteorites—and as you know, the odds are about ten to one against their being of ferrous composition. Astounding Stories, April, 1931 Iodine, antimony trichloride, molybdenum pentachloride, ferric chloride, ferric oxide, antimony, tin, stannic oxide and ferrous sulphate have all been used as chlorine carriers. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3 "Chitral" to "Cincinnati" The ore is first treated with dilute sulphuric acid, and then ferrous or calcium chloride added, thus forming copper chlorides. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" Its principle is that a solution of ferrous oxalate in neutral potassium oxalate is effective as a developer. Crayon Portraiture Complete Instructions for Making Crayon Portraits on Crayon Paper and on Platinum, Silver and Bromide Enlargements No pill made essentially of aloes and ferrous sulphate, said the government experts, could do these things. Old English Patent Medicines in America The precipitating agent below may be ferrous sulphate, various sulphides, native metals, or organic matter. The Economic Aspect of Geology CHLORITE, a group of green micaceous minerals which are hydrous silicates of aluminium, magnesium and ferrous iron. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3 "Chitral" to "Cincinnati" The liquor was then filtered from the iron oxides, and the filtrate treated with scrap iron, which precipitated the copper and reformed ferrous chloride, which could be used in the first stage of the process. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" Where iron is present in the form of pyrites, or ferrous silicate, it does not seem to cause reversion. Manures and the principles of manuring The stuff prefers magnesium ions to ferrous ions. Cum Grano Salis Invariably there is among these a formula for ferrous oxalate developer. Bromide Printing and Enlarging A Practical Guide to the Making of Bromide Prints by Contact and Bromide Enlarging by Daylight and Artificial Light, With the Toning of Bromide Prints and Enlargements A greyish drab may be got by adding ferrous sulphate. Vegetable Dyes Being a Book of Recipes and Other Information Useful to the Dyer Calcination with ferrous sulphate converts all the copper sulphide into sulphate. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" Maercker has found that in moor soils containing ferrous sulphate, no nitrates, or mere traces of nitrates, could be found. Manures and the principles of manuring This defect may result from various causes, viz.: 1st. The stock ferric oxalate solution is impaired by a partial reduction of the ferric salt into ferrous oxalate. Photographic Reproduction Processes It will therefore be sufficient to state the average composition, which is:—ferrous oxide, manganous oxide, potash, lime, boracic acid, magnesia, soda, lithia, and water. The Chemistry, Properties and Tests of Precious Stones Many years ago I prepared my own hard rouge by precipitating ferrous sulphate solution by aqueous ammonia, washing the precipitate, and heating it to a red heat. On Laboratory Arts The conversion of copper sulphide into the chlorides may be accomplished by calcining with common salt, or by treating the ores with ferrous chloride and hydrochloric acid or with ferric chloride. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" When oxygen, in a free or gaseous state, comes into contact with iron, it produces ferrous oxide, which is recognized as rust. Electricity for Boys The former reaction indicates that it contains no ferrous salt, and the latter no basic oxalate. Photographic Reproduction Processes Products of 'denitration'.—The esters were treated with ferrous chloride in boiling aqueous solution. Researches on Cellulose 1895-1900 The ferrous ammonium sulphate solution is previously standardised by titration with a potassium bichromate solution of one-tenth the above strength, made by diluting 10 c.c. of the strong solution to 100 c.c. with water. The Handbook of Soap Manufacture The ferrous chloride formed at the same time is converted into ferric chloride which can be used to moisten the heaps. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" Filter off some of the infusion and test 5 cc. with ferrous sulphate solution made by dissolving 1 gm. Human Foods and Their Nutritive Value If it does not contain any ferrous oxalate it can be used by adding to it a little of the iron chlorate solution. 2d. Photographic Reproduction Processes The changes which take place when a ferric salt is converted into a ferrous salt are the reverse of the ones just described. An Elementary Study of Chemistry This may be readily detected by adding to a small quantity of the oil two or three drops of caustic soda solution, and a few drops of ferrous sulphate solution containing ferric salt. The Handbook of Soap Manufacture Ores in which the copper is present as oxide or carbonate are soluble in sulphuric or hydrochloric acids, ferrous chloride, ferric sulphate, ammoniacal compounds and sodium thiosulphate. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" What change in color did you observe when the ferrous sulphate solution was added to the tea infusion? Human Foods and Their Nutritive Value On this fact depends the process of mordanting wool with potassium bichromate, alum, alumina sulphate, ferrous sulphate, copper sulphate, etc. The Dyeing of Woollen Fabrics The silver ore is treated with common salt and ferrous compounds, which process converts the silver first into chloride and then into metallic silver. An Elementary Study of Chemistry The smoke thus produced reduces the red ferric oxide to blue-green ferrous oxide, or to metallic iron, which combines with the silica present to form a fusible ferrous silicate. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" Hot air is blown into the filtrate, which contains ferrous or calcium chlorides, to expel the excess of sulphur dioxide, and the liquid can then be used again. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" A delicate test for the acid, free or in combination, is to dissolve in the suspected fluid some crystals of ferrous sulphate, and then to gently pour down the test-tube some strong sulphuric acid. Aids to Forensic Medicine and Toxicology Examine pieces of the metal and also some of its compounds, as ferrous sulphate, ferric chloride, and ferric oxide or iron rust. Physiology and Hygiene for Secondary Schools In the amalgamation process for extracting silver, how does ferrous chloride convert silver chloride into silver? An Elementary Study of Chemistry The crude bromine is purified by repeated shaking with potassium, sodium or ferrous bromide and subsequent redistillation. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" Those derived from the lower oxide, known as ferrous salts, are generally pale and greenish. A Text-book of Assaying: For the Use of Those Connected with Mines. I am old enough to remember when we used to develop our plates in ferrous sulfate solution and you never saw nicer negatives than we got with it. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries The ferrous solution, used for reducing the silver citrate, had been brought to exact neutrality with sodium hydroxide. Scientific American Supplement, No. 711, August 17, 1889 Ferrous sulphate is the most familiar ferrous compound. An Elementary Study of Chemistry In the variety known as nemalite the structure is finely fibrous and the lustre silky: this variety contains 5 to 8% of ferrous oxide replacing magnesia, and has consequently a rather higher specific gravity, viz. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" In the red and brown iron ores and ochres ferric iron is present; in chalybite the iron is in the ferrous state; and in magnetite it is present in both forms. A Text-book of Assaying: For the Use of Those Connected with Mines. The deposit consisting of ferrous and ferric phosphates mixed with black iron oxide may be varied in composition, texture and color. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries To appreciate the difficulty of arriving at a correct conclusion, it must be remembered that the silver precipitate is obtained saturated with strong solutions of ferric and ferrous citrate, sodium citrate, sulphate, etc. Scientific American Supplement, No. 711, August 17, 1889 Write the equations showing how each of the following compounds of iron could be obtained from the metal itself: ferrous chloride, ferrous hydroxide, ferrous sulphate, ferrous sulphide, ferrous carbonate, ferric chloride, ferric sulphate, ferric hydroxide. An Elementary Study of Chemistry Black Russia leather is dyed with alum, extract of sanders, and ferrous sulphate. Scientific American Supplement, No. 561, October 2, 1886 The solution of ferrous sulphate was made by dissolving 5.01 grams of iron wire in 100 c.c. of dilute sulphuric acid and diluting to 1 litre. A Text-book of Assaying: For the Use of Those Connected with Mines. Organic acids, ferrous oxide, chromic oxide, ammonium salts, etc., prevent the formation of peroxide and the red color produced by permanganic acid. Scientific American Supplement, No. 441, June 14, 1884. It continues to evolve gas, and after awhile, no longer yields a dark blue precipitate with ferrous salts, but a dark green or slate-colored precipitate. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations Like iron they form two series of compounds, but the salts corresponding to the ferrous salts are the most common, the ones corresponding to the ferric salts being difficult to obtain. An Elementary Study of Chemistry B is a flask, having a capacity of 125 or 150 c.c., in which the nitrate is decomposed in the usual manner by means of ferrous chloride and hydrochloric acid. Scientific American Supplement, No. 561, October 2, 1886 When iron is present it will be reduced to the ferrous state before the copper sulphide begins to separate. A Text-book of Assaying: For the Use of Those Connected with Mines. On treatment with a solution of ferrous chloride, nitric oxide and "soluble" starch are regenerated. Nitro-Explosives: A Practical Treatise Sheets of iron here precipitate all silver and copper, and the resulting solution of ferrous sulphate is, with the usual precautions, discharged into the sewer. Scientific American Supplement No. 819, September 12, 1891 Those compounds in which the iron is divalent are known as ferrous compounds, while those in which it is trivalent are known as ferric. An Elementary Study of Chemistry The flask, B, is now heated as long as may be necessary in order to produce, on cooling, the diminished pressure required for the introduction of the ferrous chloride and hydrochloric acid. Scientific American Supplement, No. 561, October 2, 1886 In another experiment, in which 50 c.c. of the ferrous sulphate solution were titrated with "permanganate," 48 c.c. of the latter were required. A Text-book of Assaying: For the Use of Those Connected with Mines. The writing on old and faded documents may be restored, by chemical treatment, turning the iron salt still remaining into ferrous sulphate. Disputed Handwriting An exhaustive, valuable, and comprehensive work upon one of the most important subjects of to-day. With illustrations and expositions for the detection and study of forgery by handwriting of all kinds The instrument is then removed to the dark room, and the plates developed by immersing them all at once in a solution consisting of four parts potassium oxalate and one part ferrous sulphate. Scientific American Supplement, No. 520, December 19, 1885 This substance bears the same relation to ferrous sulphide that hydrogen dioxide does to water. An Elementary Study of Chemistry When the oxidation is nearly completed only very small amounts of the ferrous compounds remain unoxidized and the reaction with the indicator is no longer instantaneous. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Calculate the percentages of ferrous, ferric, and total iron. A Text-book of Assaying: For the Use of Those Connected with Mines. Iron sulphate, or ferrous sulphate, is the green vitriol. The Boy Mechanic: Volume 1 700 Things for Boys to Do Owing to the carbonates that are always present in sewage, ferrous carbonate is also formed. Scientific American Supplement, No. 799, April 25, 1891 They not only have formulas similar to the ferrous salts, but resemble them in many of their chemical properties. An Elementary Study of Chemistry The latter object is accomplished by oxidation to stannic chloride by means of mercuric chloride added in excess, as the mercuric salts have no effect upon ferrous iron or the bichromate. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Indirect Titration.—The action of permanganate of potash upon a ferrous solution is one of oxidation, hence it is evident that if any other oxidising agent is present it will count as permanganate. A Text-book of Assaying: For the Use of Those Connected with Mines. A bath of equal volumes of saturated solutions of alum and ferrous sulphate gives the negative a deep olive-brown color and an extraordinary intensity, which excludes all possible necessities of an after intensification. Scientific American Supplement, No. 415, December 15, 1883 "The results of this chemical investigation show that the chief advantages of this system of putrefaction are: "First.—The active agent, hydrated ferrous oxide, is prepared within the sewage itself as a flocculent precipitate. Scientific American Supplement, No. 799, April 25, 1891 The electromagnetic signature left remnant on the tapes, the molecular alignment of the ferrous and chromium oxide particles in this case were peculiarly characteristic. Terminal Compromise: computer terrorism: when privacy and freedom are the victims: a novel The most important combinations among the foregoing are: Potassium bichromate and ferrous salts; potassium permanganate and ferrous salts; potassium permanganate and oxalic acid, or its derivatives; iodine and sodium thiosulphate; hypochlorites and arsenious acid. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Ferric salts are thereby quickly reduced to ferrous; in hot solutions nitric acid is decomposed. A Text-book of Assaying: For the Use of Those Connected with Mines. A cone-shaped bit of sponge, saturated with ferrous sulphate, was passed into each anterior naris, and another piece of sponge, similarly medicated, into either posterior naris. Anomalies and Curiosities of Medicine The exposed plate is then treated with reducing agents, as pyrogallic acid, ferrous sulphate, etc., to develop the latent image. The Gutenberg Webster's Unabridged Dictionary Section P and Q Usually, however, an iron-salt, like ferrous sulphate, is artificially introduced in solution and then decomposed by heat, so as to form in the pores a rich red pigment. The Project Gutenberg Encyclopedia Volume 1 of 28 The two solutions to be employed in the process under consideration are those of potassium bichromate and ferrous sulphate. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Chromates are reduced to chromic salts by the action of most reducing agents in the presence of an acid; and this property is used in assaying for the volumetric determination of ferrous iron, &c. A Text-book of Assaying: For the Use of Those Connected with Mines. "Then you have no prejudices as to which is the best developer, pyrogallic acid or ferrous oxalate, not to mention such recent decoctions as eikonogen, quinol, and others?" One Day's Courtship The manganese peroxide dissolves very readily, transforming its equivalent of ferrous sulphate into ferric sulphate. Scientific American Supplement, No. 401, September 8, 1883 Others—the alums, ferrous sulphate, ferric chloride, magnesic and aluminic chlorides, bleaching powder, camphor, salicylic acid, chloroform, creosote, and carbolic acid—decidedly arrested the development of bacteria. Scientific American Supplement, No. 288, July 9, 1881 From the volumes of the solutions used, after applying corrections for burette readings, and, if need be, for the temperature of solutions, calculate the value of the ferrous solution in terms of the oxidizing solution. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes This method, which is the one commonly used, is based on the determination of the amount of ferrous iron oxidised by a known weight of the ore. A Text-book of Assaying: For the Use of Those Connected with Mines. Thus the ultimate products are phosphoric acid and ferrous chloride, which on exposure to air is oxidised to ferric chloride and oxide. Acetylene, the Principles of Its Generation and Use A Practical Handbook on the Production, Purification, and Subsequent Treatment of Acetylene for the Development of Light, Heat, and Power By means of this liquid we determine volumetrically the quantity of ferrous sulphate remaining in the solution of manganese. Scientific American Supplement, No. 401, September 8, 1883 Making the ferrous oxalate solution from two saturated solutions of iron sulphate and potassium oxalate has not succeeded so well with me for transparencies. Scientific American Supplement, No. 288, July 9, 1881 Such standards may take the form of pure crystalline salts, such as ferrous ammonium sulphate, or may be in the form of iron wire or an iron ore of known iron content. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The assay resolves itself into one for the determination of ferrous iron, for which the standard solutions and method of working described under Iron are used. A Text-book of Assaying: For the Use of Those Connected with Mines. Diamond, sir, in extraordinary evidence! in conjunction with specular iron ore, commonly called the red haematite, and the ferrous carbonate, or spathic iron. The Lord of the Sea We take then 50 c. c. of the original solution of ferrous sulphate diluted as above, and determine the total ferrous salt. Scientific American Supplement, No. 401, September 8, 1883 The ferrous sulphate combines with the nitric acid, forming two new salts—ferric nitrate and ferric sulphate. Scientific American Supplement, No. 288, July 9, 1881 The two substances most commonly used as standards for a bichromate solution are ferrous ammonium sulphate and iron wire. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Ten c.c. of a solution of permanganate of potash is found to oxidise 10 c.c. of an acid solution of ferrous sulphate. A Text-book of Assaying: For the Use of Those Connected with Mines. To each tube, add 1/2 teaspoonful of ferrous sulphate solution and let the tubes stand. School and Home Cooking The difference between the two determinations corresponds to the ferrous salt which has been peroxidized by the manganese peroxide. Scientific American Supplement, No. 401, September 8, 1883 This gives rise to two kinds of salts, ferrous and ferric, as in FeCl2 and Fe2Cl6 The valence of Fe in ferric salts is 4. An Introduction to Chemical Science If pure ferrous ammonium sulphate is used as the standard, clear crystals only should be selected. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes How much of the ferrous solution will be oxidised in the second titration? A Text-book of Assaying: For the Use of Those Connected with Mines. Of late, the composition of writing inks has become far less constant, aniline and other dyes being frequently employed, and other metallic salts substituted for the ferrous- sulphate formerly invariably used. Forty Centuries of Ink or, a chronological narrative concerning ink and its backgrounds, introducing incidental observations and deductions, parallels of time and color phenomena, bibliography, chemistry, poetical effusions, citations, anecdotes and curiosa together with some evidence respecting the evanescent character of most inks of to-day and an epitome of chemico-legal ink. In the case of a steel or cast iron containing but little manganese it is convenient to dissolve the peroxide in 25 c. c. only of the ferrous solution. Scientific American Supplement, No. 401, September 8, 1883 Write the symbols for ferrous and ferric hydrate; for the oxides; for the nitrates. An Introduction to Chemical Science PROCEDURE.—Fill a glass-stoppered burette with the permanganate solution, observing the usual precautions, and fill a second burette with the ferrous sulphate solution prepared for use with the potassium bichromate. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Cool and titrate the remaining ferrous iron with the permanganate or bichromate of potassium solution. A Text-book of Assaying: For the Use of Those Connected with Mines. By the addition of ferrous sulfate, which undoubtedly functions as an oxygen carrier, the reaction is extended over a longer period of time. Organic Syntheses Calculate the percentage as ferrous oxide, unless there are reasons to the contrary, also calculate its weight as ferric oxide. A Text-book of Assaying: For the Use of Those Connected with Mines. Colors.—The characteristic color of ferrous salts is green, as in FeSO4. An Introduction to Chemical Science Run out into a beaker about 40 cc. of the ferrous solution, dilute to about 100 cc., add 10 cc. of dilute sulphuric acid, and run in the permanganate solution to a slight permanent pink. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The solution containing the chromate is added, and the remaining ferrous iron titrated with the permanganate or bichromate of potassium solution, as described under Iron. A Text-book of Assaying: For the Use of Those Connected with Mines. It is thus possible to work with much larger quantities of material when ferrous sulfate is employed. Organic Syntheses A similar solution may be made by dissolving 24.82 grams of pure ferrous sulphate crystals in water, adding 100 c.c. of dilute sulphuric acid, and diluting to 1 litre. A Text-book of Assaying: For the Use of Those Connected with Mines. These salts give the green color to the chlorophyll in leaves and grass, and bottle glass owes its green color to ferrous silicate. An Introduction to Chemical Science Those in most common use are iron wire, ferrous ammonium sulphate, sodium oxalate, oxalic acid, and some other derivatives of oxalic acid. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The indicator is a saturated solution of iron alum, or a solution of ferric sulphate of equivalent strength made by titrating acid ferrous sulphate with potassium permanganate. A Text-book of Assaying: For the Use of Those Connected with Mines. It is important that the materials should be added in the correct order; should the sulfuric acid be added before the ferrous sulfate, the reaction may start at once. Organic Syntheses If the solution be evaporated to dryness the oxidising power of concentrated sulphuric acid comes into play, so that very little ferrous iron will be left. A Text-book of Assaying: For the Use of Those Connected with Mines. Bricks are made from a greenish blue clay in which iron exists in the ferrous state. An Introduction to Chemical Science As in the case of the bichromate process, it is necessary to reduce the iron completely to the ferrous condition before titration. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes To effect this, boil the nitric acid solutions with 30 c.c. of a solution containing 15 grams each of alum and ferrous sulphate to the litre. A Text-book of Assaying: For the Use of Those Connected with Mines. It is also important to mix the materials well before applying heat; the aniline sulfate should have dissolved almost completely and the ferrous sulfate should be distributed throughout the solution. Organic Syntheses Calculate from the following determinations the percentages of ferrous, ferric, and total iron in the sample of ore used. A Text-book of Assaying: For the Use of Those Connected with Mines. On being heated, ferrous salts are oxidized to ferric, and their color is changed to red. An Introduction to Chemical Science The results are likely to be less accurate in this case, however, as a consequence of secondary reactions between the ferrous iron and the manganese dioxide thrown down. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes It is convenient to speak of the iron in a ferrous salt as ferrous iron, and when in the ferric state as ferric iron. A Text-book of Assaying: For the Use of Those Connected with Mines. Solutions of ferrous sulphate and of ferrous chloride were made containing 0.5 gram of iron in each 100 c.c., thus corresponding to the standard solutions of permanganate and bichromate of potassium. A Text-book of Assaying: For the Use of Those Connected with Mines. The result will give the percentage of iron existing in the ore in the ferrous state. A Text-book of Assaying: For the Use of Those Connected with Mines. Solutions of ferrous salts will gradually change to ferric, if allowed to stand, thus showing the greater stability of the latter. An Introduction to Chemical Science It is possible that an intermediate manganic compound is formed which reacts rapidly with the ferrous compounds—thus in effect catalyzing the oxidizing process. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes A solution of ferrous chloride was made by dissolving 5.01 grams of iron wire in 50 c.c. of dilute hydrochloric acid and diluting to 1 litre. A Text-book of Assaying: For the Use of Those Connected with Mines. If iron is present it must be removed, since ferrous salts use up much cyanide, forming ferrocyanides, and ferric salts yield ferric hydrate, which obscures the end reaction. A Text-book of Assaying: For the Use of Those Connected with Mines. The iron is reduced to the ferrous state and phosphate of alumina precipitated in an acetic acid solution. A Text-book of Assaying: For the Use of Those Connected with Mines. Nitrates are best detected and determined by their yielding nitric oxide when treated with sulphuric acid and a suitable reducing agent, such as ferrous sulphate, mercury, or copper. A Text-book of Assaying: For the Use of Those Connected with Mines. The contamination of the barium sulphate by iron is much less in the presence of ferrous than ferric salts. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes When the residue is clean and sandy-looking, and free from black particles, the flask is cooled, and the residual ferrous iron is determined by titration with "permanganate." A Text-book of Assaying: For the Use of Those Connected with Mines. The difference between the ferrous iron taken and that found, gives the amount oxidized by the nitrate. A Text-book of Assaying: For the Use of Those Connected with Mines. After cooling, a solution of ferrous sulphate is poured on its surface, so as to form a layer resting on it. A Text-book of Assaying: For the Use of Those Connected with Mines. In this operation the metals are converted into chlorides by the action of ferric chloride, which gives up a part of its chlorine, and becomes reduced to the ferrous salt. A Text-book of Assaying: For the Use of Those Connected with Mines. The ferrous iron is determined by dissolving another 2 grams in hydrochloric acid and at once titrating with the permanganate of potassium solution. A Text-book of Assaying: For the Use of Those Connected with Mines. This is based on the oxidation of ferrous iron by the solution containing the chromium as chromate. A Text-book of Assaying: For the Use of Those Connected with Mines. This is based on the oxidising action of nitric acid, or of nitrates in acid solutions on ferrous salts. A Text-book of Assaying: For the Use of Those Connected with Mines. Make up to 100 c.c. with water, and pass sulphuretted hydrogen to reduce the ferric iron to the ferrous state, then add 20 c.c. of dilute ammonia, and again pass sulphuretted hydrogen. A Text-book of Assaying: For the Use of Those Connected with Mines. The ammonia precipitate contains the whole of the iron as ferric oxide; hence the necessity for calculating the ferrous oxide as ferric, and deducting it. A Text-book of Assaying: For the Use of Those Connected with Mines. Ferrous Oxide.—When a qualitative test shows both ferric and ferrous oxide to be present, the proportion of the ferrous oxide must be separately determined. A Text-book of Assaying: For the Use of Those Connected with Mines. The precipitate is dissolved in hydrochloric acid and the iron reduced to the ferrous state. A Text-book of Assaying: For the Use of Those Connected with Mines. The iron found is multiplied by 1.286, and reported as ferrous oxide. A Text-book of Assaying: For the Use of Those Connected with Mines. To find the proportion of ferric oxide, the ferrous iron found is multiplied by 1.428, and this is deducted from the weight of ferric oxide obtained by precipitation with ammonia. A Text-book of Assaying: For the Use of Those Connected with Mines. |
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