| 单词 | gravimetric |
| 例句 | Silicon has emerged as a promising alternative to conventional graphite anodes in high-energy lithium-ion batteries due to its exceptional gravimetric capacity. Unlocking the potential of silicon anode materials for commercialized batteries 2023-09-28T04:00:00Z For a precipitation reaction to be useful in a gravimetric analysis, the product of the reaction must be insoluble. Chemistry 2019-02-14T00:00:00Z Powder of a lighter gravimetric density is occasionally employed, when the weight of the charge is reduced to 33 grains. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 6 "Groups, Theory of" to "Gwyniad" 2011-12-16T03:00:12.320Z Volumetric methods are used, but the uncertainty of the end of the reaction has led to the suggestion of special indicators, or of determining the amount of cuprous oxide gravimetrically. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2 "Gloss" to "Gordon, Charles George" 2011-10-31T02:00:28.703Z During metabolic measurements at temperatures above freezing, evaporative water loss was determined gravimetrically. Metabolic Adaptation to Climate and Distribution of the Raccoon Procyon Lotor and Other Procyonidae 2011-05-07T02:00:34.980Z Coast and Geodetic Survey, he accomplished the important gravimetric work described in this article. Development of Gravity Pendulums in the 19th Century Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966 2011-01-22T03:00:16.753Z The required change of state in a gravimetric analysis may be achieved by various physical and chemical processes. Chemistry 2019-02-14T00:00:00Z The most accurate method for the determination of lead in ores is the gravimetric method, in which it is weighed as lead sulphate after the various impurities have been separated. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" On the other hand those obtained by the gravimetric method are too low. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. Volumetric analysis, possessing as it does many advantages over the gravimetric methods, has of late years been extensively developed. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" In physical geodesy, gravimetric data are used for the determination of the geoid and components of deflections of the vertical. Development of Gravity Pendulums in the 19th Century Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966 2011-01-22T03:00:16.753Z The elemental composition of hydrocarbons and related compounds may be determined via a gravimetric method known as combustion analysis. Chemistry 2019-02-14T00:00:00Z The course in quantitative analysis should cover the determination of the more important basic and acid radicals, and should consist of both gravimetric and volumetric exercises. College Teaching Studies in Methods of Teaching in the College In this volume only incidental attention is given to gravimetric methods of proportioning concrete. Concrete Construction Methods and Costs While successfully investigating the solid elements and their compounds gravimetrically, Berzelius was guilty of several inconsistencies in his views on gases. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" With astronomical observations or with existing triangulations, the gravimetric method can accomplish further results. Development of Gravity Pendulums in the 19th Century Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966 2011-01-22T03:00:16.753Z Combustion analysis is a gravimetric method used to determine the elemental composition of a compound by collecting and weighing the gaseous products of its combustion. Chemistry 2019-02-14T00:00:00Z In addition to these instruments, complete arrangements for determining the gravimetric densities and hygrometric properties of different samples of gunpowder were made. History of the Confederate Powder Works Our course is not straight, but is necessarily an erratic one as we are subject to the gravimetric pull of all of the celestial bodies. Giants on the Earth The method may be also carried out gravimetrically, in which case petroleum ether, boiling at 74° C. is used for washing out the beaker into the separator. The Handbook of Soap Manufacture The gravimetric methods of physical geodesy, in conjunction with methods such as those of seismology, enable scientists to test hypotheses concerning the internal structure of the earth. Development of Gravity Pendulums in the 19th Century Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966 2011-01-22T03:00:16.753Z Perform stoichiometric calculations using typical titration and gravimetric data. Chemistry 2019-02-14T00:00:00Z As the gravimetric density of powder varies from 860 to 940, the weight of the contents of ten measures should be ascertained for each lot, and allowance made accordingly before filling the cartridges. Ordnance Instructions for the United States Navy. 1866. Fourth edition. When the iron in the solution much exceeds 0.2 gram the volumetric determination is generally adopted, as the bulkiness of the precipitate of ferric hydrate makes the gravimetric method very inconvenient. A Text-book of Assaying: For the Use of Those Connected with Mines. The gravimetric method can be substituted by the volumetric by introducing a solution of sodium sulphide of known strength into the ammoniacal filtrate. Scientific American Supplement, No. 455, September 20, 1884 For many years, as a matter of convenience, the classes for which this text was originally prepared were divided, one part beginning with gravimetric processes and the other with volumetric analyses. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Also common are gravimetric techniques in which the analyte is subjected to a precipitation reaction of the sort described earlier in this chapter. Chemistry 2019-02-14T00:00:00Z All the powder of any lot being made of the same mill-cake, the specific gravities are equal although the gravimetric densities may vary. Ordnance Instructions for the United States Navy. 1866. Fourth edition. The solution is then ready for gravimetric determination. A Text-book of Assaying: For the Use of Those Connected with Mines. Organic reagents used in gravimetric and volumetric analysis. U.S. Copyright Renewals, 1976 July - December The methods of quantitative analysis are subdivided, according to their nature, into those of !gravimetric analysis, volumetric analysis!, and !colorimetric analysis!. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The copper, after having been washed, dried, and weighed, gave identical results with regard to percentage with a careful gravimetric estimation. Scientific American Supplement, No. 586, March 26, 1887 Williams also improved his original method and devised a gravimetric method for the same purpose. The Vitamine Manual It may be weighed; or dissolved in nitric acid, and the silver determined gravimetrically in the diluted and filtered solution. A Text-book of Assaying: For the Use of Those Connected with Mines. For gravimetric work the solution is acidified with hydrochloric acid, then mixed with ammonia in slight excess, boiled, and filtered. A Text-book of Assaying: For the Use of Those Connected with Mines. Volumetric methods are generally more rapid, require less apparatus, and are frequently capable of greater accuracy than gravimetric methods. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes What weight of the mixed sulphates of potash and cobalt will be obtained in a gravimetric determination on 1 gram of the ore? A Text-book of Assaying: For the Use of Those Connected with Mines. Cobalt is also gravimetrically determined, like nickel, by electrolysis, or by precipitation with sodic hydrate. A Text-book of Assaying: For the Use of Those Connected with Mines. The lead will be in the filtrate, and is recovered in a state fit for direct gravimetric estimation by the addition of dilute sulphuric acid. A Text-book of Assaying: For the Use of Those Connected with Mines. Unfortunately this titration serves simply to replace the gravimetric determination, and does not, as many volumetric processes do, lessen the necessity for a complete separation of any other metals which are present. A Text-book of Assaying: For the Use of Those Connected with Mines. The processes of volumetric analysis are, in general, simpler than those of gravimetric analysis and accordingly serve best as an introduction to the practice of quantitative analysis. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The titration of the zinc takes less time, and, with ordinary working, is more trustworthy than the gravimetric method. A Text-book of Assaying: For the Use of Those Connected with Mines. The filtrate is now ready for the gravimetric determination. A Text-book of Assaying: For the Use of Those Connected with Mines. Wet assays, as generally understood, would include not only those which we class as wet gravimetric assays, but also all the volumetric processes. A Text-book of Assaying: For the Use of Those Connected with Mines. In dry assays the metal is almost always separated and weighed as metal; in wet gravimetric assays the metal is more usually weighed in the form of a definite compound of known composition. A Text-book of Assaying: For the Use of Those Connected with Mines. A standard wire is to be purchased in the market which answers the purpose well, and its iron content may be determined for each lot purchased by a number of gravimetric determinations. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The calculation of the results of a gravimetric assay has already been referred to. A Text-book of Assaying: For the Use of Those Connected with Mines. Dry assays form a branch of gravimetric work, and we shall include under this head all those assays requiring the help of a wind furnace. A Text-book of Assaying: For the Use of Those Connected with Mines. For a gravimetric determination they would require to be removed before precipitating with "magnesia mixture." A Text-book of Assaying: For the Use of Those Connected with Mines. All assays for it are made either gravimetrically or volumetrically. A Text-book of Assaying: For the Use of Those Connected with Mines. It is perhaps even better to determine by gravimetric methods once for all the iron content of a large commercial sample which has been ground and well mixed. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes This may be looked upon as an alternative to the gravimetric method. A Text-book of Assaying: For the Use of Those Connected with Mines. It follows from what has been said that there is no direct gravimetric determination. A Text-book of Assaying: For the Use of Those Connected with Mines. These offer little advantage over the easy gravimetric determination. A Text-book of Assaying: For the Use of Those Connected with Mines. On the completion of the distillation, the iodine will be in the distillate as iodide; and the gravimetric determination is made on this. A Text-book of Assaying: For the Use of Those Connected with Mines. Among the operations which are common to nearly all gravimetric analyses are precipitation, washing of precipitates, ignition of precipitates, and the use of desiccators. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes This method is quicker, but less exact, than the direct gravimetric determination. A Text-book of Assaying: For the Use of Those Connected with Mines. There is no dry assay for this substance, nor volumetric method; when the determination is required, it is carried out gravimetrically and, generally, by the following plan. A Text-book of Assaying: For the Use of Those Connected with Mines. The gravimetric determination of baryta, when lime and strontia are absent, is as follows:—The solution, if it contains much free acid, is nearly neutralised with ammonia, and then diluted to 100 or 200 c.c. A Text-book of Assaying: For the Use of Those Connected with Mines. The analytical balance, the fundamentally important instrument in gravimetric analysis, has already been described on pages 11 to 15. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes In order to avoid burdensome repetitions in the descriptions of the various gravimetric procedures which follow, certain general instructions are introduced at this point. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes For the purpose of gravimetric determination, phosphoric acid is usually precipitated from ammoniacal solutions in the form of magnesium ammonium phosphate which, on ignition, is converted into magnesium pyrophosphate. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Given the following data: 25 cc. of a hydrochloric acid, when standardized gravimetrically as silver chloride, yields a precipitate weighing 0.5465 gram. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes |
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