| 单词 | naphthalene |
| 例句 | Entomology smells like mothballs and oil: a preservative that, Dr. Geffard explains, is called naphthalene. All the Light We Cannot See 2014-05-06T00:00:00Z The spray was a 25 per cent DDT concentrate suspended in a solvent containing methylated naphthalenes. Silent Spring 1962-09-27T00:00:00Z Some new carpets also contain the moth-proofing chemical naphthalene, which is known to produce toxic reactions, especially in newborns. 5 popular home products that can be surprisingly toxic 2014-04-11T11:50:00Z It said those samples showed elevated levels of the hazardous chemicals benzene and naphthalene. Alabama plant owned by W.V. governor’s family fined $925,000 2022-12-16T05:00:00Z Our test results indicated that all the 52 children we tested had high levels in their urine of metabolised naphthalene, a possible carcinogen. Air pollution: Uncovering the dirty secret behind BP’s bumper profits 2022-11-11T05:00:00Z The principal component of mothballs is naphthalene, a compound with a molecular mass of about 130 amu, containing only carbon and hydrogen. Chemistry 2019-02-14T00:00:00Z After further investigation, they realized they hadn’t even administered naphthalene at all, but rather a then-obscure drug called acetanilide, which the pharmacist had given them by mistake. Opinion | Bill Gates: How to Develop Life-Saving Drugs Much Faster 2022-04-15T04:00:00Z The agency noted Tesla’s use of toxic chemicals in its paint shop — formaldehyde, ethylbenzene, naphthalene, and xylene, “known or suspected to cause cancer or other serious side effects.” After years of pollution violations, Tesla is fined $275,000 by the EPA 2022-02-23T05:00:00Z The National Center for Biotechnology Information said naphthalene is obtained from coal tar or petroleum distillation and is used in the manufacturing of plastics and in moth repellents. San Angelo residents told not to drink water as odor probed 2021-02-09T05:00:00Z And even before nanowire bacteria were shown to be electric, they showed promise for decontaminating nuclear waste sites and aquifers contaminated with aromatic hydrocarbons such as benzene or naphthalene. ‘Electric mud’ teems with new, mysterious bacteria 2020-08-19T04:00:00Z One of them, naphthalene, is an active ingredient in moth repellents. Nine universities under 50 in the fast lane 2019-10-22T04:00:00Z In 2008, the EU banned the use of naphthalene, a toxic, flammable chemical long used in mothballs. Revenge of the clothes moths: as numbers boom, can they be stopped? 2019-08-19T04:00:00Z The rest is chemically bound with hydrogen in either a grease-like form, known as aliphatic carbon, or as a gaseous version of naphthalene, the main chemical component of mothballs. Space is full of dirty, toxic grease, scientists reveal 2018-06-27T04:00:00Z Even if the pollutants for which that’s an issue are ignored, Precision Castparts’ release of benzene, 1,3-butadiene, naphthalene and formaldehyde are high enough that the state would require additional scrutiny, our analysis shows. Oregon’s new clean air law provides more info than action 2018-03-19T04:00:00Z The Office of General Services says trace amounts of naphthalene were found in samples taken from faucets inside the 44-floor Corning Tower, located on the Empire State Plaza in downtown Albany. Trace of mothballs chemical found in state agencies’ water 2018-03-12T04:00:00Z Old heating-oil storage tanks buried in yards were linked to the presence of benzene, a known carcinogen; and naphthalene, a possible carcinogen. South Carolina editorial roundup 2017-12-20T05:00:00Z Authorities said two employees illegally transported and dumped a significant amount of a chemical known as naphthalene into the ground of a Savannah neighborhood in 2015. Louisiana firm pleads guilty to dumping waste in Georgia 2017-12-20T05:00:00Z The third of the naphthalenes, endrin, is perhaps the most toxic of all the chlorinated hydrocarbons now in use. Silent Spring—I 2017-01-03T05:00:00Z Former employee Brian Dennis, who was employed at the works for 26 years, said these included naphthalene, benzene, tar and ammonia. Redcar steelworks: Health fears over steelworks clean-up - BBC News 2016-09-25T04:00:00Z An EPA statement says contaminants on the site included benzene, toluene, ethylbenzene and naphthalene. EPA: Cleanup work done at Superfund site in Gulfport 2016-03-29T04:00:00Z The EPA says contaminants on the site included benzene, toluene, ethylbenzene and naphthalene. Officials say EPA Superfund site cleaned up, ready for use 2016-03-29T04:00:00Z The study revealed how naphthalene is converted by the liver into metabolites that cause cell damage and death in the lung — even though naphthalene itself is relatively harmless to this organ. Artificial organs: Honey, I shrunk the lungs : Nature : Nature Publishing Group 2015-03-24T04:00:00Z The only recommended limit for naphthalene -- 2 parts per billion -- is for chronic exposure over many decades, Fine said. Port of L.A. fire cleanup: Effects of toxic chemical releases studied 2014-09-26T04:00:00Z Regulators are also monitoring the potential for release of various chemicals—including disulfides, benzene, xylenes, and naphthalene—near compressor stations, although cause and effect has not been established. Fracking The Anti-Fracking Movement: The Inside Story Of The Foundation Behind The Activist Campaign To Discredit Natural Gas 2014-08-26T04:00:00Z Starting with molecules such as benzene and naphthalene, his team built “every imaginable derivative”, he says. Chemical biology: DNA's new alphabet 2012-11-21T18:21:07.117Z I got an email from the Columbia Center for Children’s Environmental Health about a new study on the toxicity of naphthalene, considered a common air pollutant: “Children Exposed to Naphthalene Show Signs of Chromosomal Damage.” The Ever-Increasing Hazards of the Household 2012-05-31T10:45:29Z I hastily called the “boy” to bring me some, and on tasting it found to my horror that the chocolate cream was highly flavoured with naphthalene! Behind the Veil in Persia and Turkish Arabia An account of an Englishwoman's Eight Years' Residence amongst the Women of the East 2012-04-18T02:00:15.997Z It also emitted high levels of naphthalene and benzene, toxic gases released by the treated wood. Port of L.A. fire cleanup: Effects of toxic chemical releases studied 2014-09-26T04:00:00Z Of the first class, the light paraffin oils and pitch may be taken as examples; whilst benzene, naphthalene and retort carbon represent the second. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z For example, methane, benzene, naphthalene, and other "lightweight hydrocarbons" would evaporate into the atmosphere at sea level. Deepwater Horizon Study Offers New Insight 2011-07-19T14:05:00Z Favier Explosives: mixtures in varying proportions containing ammonium nitrate, nitronaphthalene, paraffin, and resin; higher nitrated naphthalenes, potassium nitrate, and tetryl may be present. The New Gresham Encyclopedia Volume 4, Part 3: Estremoz to Felspar 2011-04-14T02:00:59.373Z It is obtained from the higher boiling fractions, after separation of naphthalene and anthracene, by fractional distillation, the portion boiling between 290-340� C. being taken. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z They searched for emergency response guidelines for naphthalene and consulted state and federal authorities for a recommended limit for short-term exposure to the chemical, but, Fine said, “it just doesn't exist.” Port of L.A. fire cleanup: Effects of toxic chemical releases studied 2014-09-26T04:00:00Z The higher the heat of carbonization the more naphthalene appears to be produced, and gas managers of to-day find the removal of naphthalene from the gas a difficult problem to solve. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z They recently reported in the Journal of Agriculture and Food Chemistry that an extract of the fungus worked as well as naphthalene, the active ingredient in mothballs, at driving away stinkers. Medical: Stinkbugs' role as allergen studied 2011-03-23T17:59:03Z It is prepared as follows:—Soft soap, 6 ℔ dissolved in 1 quart of water; naphthalene, 10 oz. mixed with 1� pint of paraffin; the whole is mixed together. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 "Echinoderma" to "Edward" 2011-01-19T03:00:19.027Z Such, for example, are benzene, naphthalene and anthracene, from each of which distinct series of colouring matters are derived. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z A natural component of crude oil, 2-methylnaphthalene is structurally related to naphthalene, an ingredient in mothballs and toilet-deodorant blocks that is considered a possible human carcinogen by the EPA. U.S. regulators lack data on health risks of most chemicals 2010-08-02T04:00:00Z Gas leaves the retorts saturated with naphthalene, and its capacity for holding that impurity seems to be augmented by the presence of water vapour. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z A further quantity of impure naphthalene separates out from the next fraction—the creosote oil, and this is similarly washed and purified by distillation. Coal and What We Get from It In order to obtain the phenol from this distillate, it is treated with caustic soda, which dissolves the phenol and its homologues together with a certain quantity of naphthalene and other hydrocarbons. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 "Capefigue" to "Carneades" The colouring matter of cochineal, carminic acid, is believed by chemists to be a derivative of naphthalene, but its artificial production has not yet been accomplished. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z One of the earliest red-hot tube syntheses of importance was the formation of naphthalene from a mixture of alcohol and ether vapours. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" The condenser, by effecting the condensation of water vapour, also brings about the deposition of solid naphthalene, apart from that which naturally condenses owing to reduction of temperature. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z There are at present only a few direct uses for naphthalene, but one of its applications is sufficiently important to be mentioned. Coal and What We Get from It It is frequently stipulated that the oil should remain clear at the ordinary temperature, say 15� C., which means that no naphthalene should crystallize out. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" The more important types are derived from aromatic nuclei, benzene, naphthalene, &c.; the ortho-di-derivatives of the first named, lending themselves particularly to the formation of condensed nuclei. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" Knowing the volatility of naphthalene in warm weather and the irritating character of its vapor led me to try it. Insects and Diseases A Popular Account of the Way in Which Insects may Spread or Cause some of our Common Diseases We unlimbered the creaky-legged cots, stiff and complaining after their three years' rest, and the air was filled with the clean odor of micaceous showers of naphthalene from long-packed pillows and sheets. Edge of the Jungle Great as have been the recent advancements in the utilization of naphthalene derivatives, there is still a larger quantity of this hydrocarbon produced than is necessary to supply the wants of the colour-manufacturer. Coal and What We Get from It On cooling down, about four-fifths of the naphthalene crystallizes out on standing from three to ten days. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" The centric formula proposed by Bamberger represents naphthalene as formed by the fusion of two benzene rings, this indicates that it is a monocyclic composed of ten atoms of carbon. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" I took one room at a time, scattered on the floor five pounds of flake naphthalene and closed it for twenty-four hours. Insects and Diseases A Popular Account of the Way in Which Insects may Spread or Cause some of our Common Diseases An excess of naphthalene should also be avoided, since, on account of its strong odour, soaps containing much of it are unpopular. The Handbook of Soap Manufacture The phenols of naphthalene are called naphthols—they bear the same relationship to naphthalene that carbolic acid bears to benzene. Coal and What We Get from It About 10,000 tons of naphthalene are used annually in Germany, mostly for the manufacture of many azo-colours and of synthetic indigo. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" Restricting ourselves to compounds resulting from the fusion of benzene rings, we have first to consider naphthalene, C10H8, which consists of two benzene rings having a pair of carbon atoms in common. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" On entering such a room the naphthalene vapor will instantly bring tears to the eyes and cause coughing and irritation of the air passages. Insects and Diseases A Popular Account of the Way in Which Insects may Spread or Cause some of our Common Diseases Coal Tar.—These soaps contain, in addition to carbolic acid and its homologues, naphthalene and other hydrocarbons derived from coal, naphthol, bases, etc. The Handbook of Soap Manufacture Owing to the structure of the naphthalene molecule there are two isomeric naphthols, whereas there is only one phenol. Coal and What We Get from It The oils drained from the crude naphthalene are re-distilled and worked for carbolic acid and its isomers. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" When, as in the formation of naphthalene tetrachloride, for example, the one ring becomes saturated, the other might be expected to assume the normal centric form and become relatively inactive. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" It proved to be a perfect and effectual remedy and very inexpensive, as the naphthalene could be swept up and transferred to other rooms. Insects and Diseases A Popular Account of the Way in Which Insects may Spread or Cause some of our Common Diseases Large quantities of naphthalene are used in the preparation of indigo, a dye formerly obtained from the indigo plant, but now largely prepared by laboratory methods. An Elementary Study of Chemistry The alpha-compound is made in precisely the same way as aniline, viz. by acting upon naphthalene with nitric acid so as to form nitronaphthalene, and then reducing the latter with iron dust and acid. Coal and What We Get from It Sometimes it is redistilled, when most of the naphthalene passes over in the first fraction, between 180� and 230� C., and crystallizes out in a nearly pure state. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" But there is another hydrocarbon called naphthalene, C10H8, and this forms not one, but two phenols. The Chemistry of Hat Manufacturing Lectures Delivered Before the Hat Manufacturers' Association Two of them, I am sure, you've met before, phenol, which is common carbolic acid, and naphthalene, which we use for mothballs. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries The principal hydrocarbons obtained from the coal tar are benzene, toluene, naphthalene, and anthracene. An Elementary Study of Chemistry The first naphthalene colour was a yellow dye, discovered by Martius in 1864, and manufactured under the name of “Manchester yellow.” Coal and What We Get from It The coal tar yields not only anilin, but also carbolic acid and naphthalene, both of which are commercially valuable, the former as a widely used disinfectant, and the latter as a popular moth preventive. General Science As the name of the hydrocarbon is naphthalene, however, we call these compounds naphthols, and one is distinguished as alpha- the other as beta-naphthol, both of them having the formula C10H7OH. The Chemistry of Hat Manufacturing Lectures Delivered Before the Hat Manufacturers' Association It is possible to start from benzene, toluene or naphthalene. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries The well-known moth balls are made of naphthalene. An Elementary Study of Chemistry One of these compounds, phthalic acid, is obtained from naphthalene, and the other, resorcin or resorcinol, is prepared from benzene. Coal and What We Get from It The latter gives off a gas smelling of naphthalene which kills the Wireworms. The Culture of Vegetables and Flowers From Seeds and Roots 16th Edition The valuable constituents actually extracted are then these: benzene, toluene, xylene, naphthalene, anthracene, and phenol or carbolic acid. The Chemistry of Hat Manufacturing Lectures Delivered Before the Hat Manufacturers' Association He found that by acting on naphthalene—the moth-ball stuff—with chlorine he got a series of useful products called "halowaxes." Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries Among the compounds present are the hydrocarbons, benzene, toluene, naphthalene, and anthracene. An Elementary Study of Chemistry The acid in question, although a derivative of benzene, is most economically prepared by the oxidation of certain derivatives of naphthalene which, when completely broken down by energetic oxidizing agents, furnish the acid. Coal and What We Get from It The determination of nitro-glycerine in simple dynamite No. 1 is easy; but not so when the dynamite contains substances soluble in ether, such as sulphur, resin, paraffin, and naphthalene. Nitro-Explosives: A Practical Treatise Follow the cleaning up with a thorough distribution of flake naphthalene. One Thousand Questions in California Agriculture Answered If four atoms of chlorine enter the naphthalene molecule the product is a hard wax that rings like a metal. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries To keep away these wholesale ravagers, people generally use camphor, naphthalene, tobacco, bunches of lavender, and other strong-scented remedies. The Wonders of Instinct Chapters in the Psychology of Insects Secondary azo-colours derived from these bases and the usual naphthalene derivatives are also manufactured. Coal and What We Get from It Romit consists of 100 parts ammonium nitrate and 7 parts potassium chlorate mixed with a solution of 1 part nitro- naphthalene and 2 parts rectified paraffin oil. Nitro-Explosives: A Practical Treatise To keep away these wholesale ravages, people generally use camphor, naphthalene, tobacco, bunches of lavender and other strong-scented remedies. The Life of the fly; with which are interspersed some chapters of autobiography This last fraction, boiling between 210° C. and 240° C., is known as “carbolic oil,” because it contains, in addition to the naphthalene, the chief portion of the carbolic acid present in the tar. Coal and What We Get from It The important constituents of this portion are carbolic acid and naphthalene. Coal and What We Get from It In addition to the azo-colours, there are certain other products which claim naphthalene as a raw material. Coal and What We Get from It The di-nitro- naphthalene gives some trouble in washing, as some acid is held in the crystals which is liable to make its appearance when crushed. Nitro-Explosives: A Practical Treatise The undissolved hydrocarbon is similarly purified by fractional distillation, and furnishes the solid crystalline naphthalene. Coal and What We Get from It From this last statement it will be inferred that naphthalene is now a source of colouring-matters. Coal and What We Get from It As aniline is to benzene, so are the naphthylamines to naphthalene. Coal and What We Get from It Other colouring-matters of the same group are in use; some of them, like “new blue,” being derivatives of naphthalene. Coal and What We Get from It The history of another important group of colouring-matters dependent on naphthalene begins with A. v. Coal and What We Get from It Their introduction has been the means of finding new uses for the naphthylamines and naphthols and their sulpho-acids, and has thus contributed largely to the utilization of naphthalene. Coal and What We Get from It The story of naphthalene is summarized in the schemes on pp. Coal and What We Get from It There are also isomeric quinones of the naphthalene series known as naphthaquinones. Coal and What We Get from It |
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