Cyanogen sulfide

Cyanide and thiocyanate anions in aqueous solution can be determined as cyanogen bromide after reaction with bromine [686]. The thiocyanate anion can be quantitatively determined in the presence of cyanide by adding an excess of formaldehyde solution to the sample, which converts the cyanide ion to the unreactive cyanohydrin. The detection limits for the cyanide and thiocyanate anions were less than 0.01 ppm with an electron-capture detector. Iodine in acid solution reacts with acetone to form monoiodoacetone, which can be detected at high sensitivity with an electron-capture detector [687]. The reaction is specific for iodine, iodide being determined after oxidation with iodate. The nitrate anion can be determined in aqueous solution after conversion to nitrobenzene by reaction with benzene in the presence of sulfuric acid [688,689]. The detection limit for the nitrate anion was less than 0.1 ppm. The nitrite anion can be determined after oxidation to nitrate with potassium permanganate. Nitrite can be determined directly by alkylation with an alkaline solution of pentafluorobenzyl bromide [690]. The yield of derivative was about 80t.with a detection limit of 0.46 ng in 0.1 ml of aqueous sample. Pentafluorobenzyl p-toluenesulfonate has been used to derivatize carboxylate and phenolate anions and to simultaneously derivatize bromide, iodide, cyanide, thiocyanate, nitrite, nitrate and sulfide in a two-phase system using tetrapentylammonium cWoride as a phase transfer catalyst [691]. Detection limits wer Hi the ppm range. 

In the blast furnace, the reaction of the nitrogen in the blast with coke leads to the formation of poisonous chemicals such as hydrogen cyanide and cyanogens, and each cubic meter of the blast furnace gas contains from 200 to 2000 mg of these compounds. The blast furnace gas is scrubbed with water in the dust collection system the cyanide compounds dissolve in the water, which is then discharged after the compounds have been destroyed. Another poisonous emission in blast furnace operations is hydrogen sulfide. The sulfur present in the coke is converted into calcium sulfide in the slag, the water-quenching of... 

Hydrocarbons, alcohols, aldehydes, ketones, carboxylic adds, quinones, esters, lactones, phenolics, steroids, alkaloids, cyanogenic glycosides, sulfides, peptides, proteins Arachnida... 

Cyanogen chloride Cyclohexane Diethyl ether Dimethyl formaldehyde Dimethyl sulfate Dimethyl sulfide Epichlorohydrin Ethyl acetate Ethyl benzene Ethylene glycol Fluorine... 

DIMETHYL SULFOXIDE ETHYLENE GLYCOL DIMETHYL SULFATE DIMETHYL SULFIDE ETHYL MERCAPTAN DIMETHYL DISULFIDE DIMETHYLAMINE ETHYLAMINE MONOETHANOLAMINE ETHYLENEDIAMINE DIMETHYL SILANE CYANOGEN... 

CYANOGEN BROMIDE CYANOGEN CHLORIDE CYANOGEN FLUORIDE CARBON MONOXIDE CARBONYL SULFIDE CARBON OXYSELENIDE CARBON DIOXIDE CARBON DISULFIDE CARBON SELENOSULFIDE CYANOGEN... 

Mono- and di-thiocyanato-1,2,4-thiadiazoles, obtained by the stepwise action of cyanogen bromide on barium 3,5-dimercapto-l,2,4-thiadiazole, and on 5-chloro- and 5-hydroxy-3-mercapto-1,2,4-thiadiazole, are somewhat labile. The structures of certain of their transformation products (e.g. mono- and di-sulfides), which may have one of several isomeric forms, are not fully elucidated. The reactivity of their cyano group, resembling that in cyanogen halides, is noteworthy it is easily removed by the action of alkalis, the parent thiol being regenerated.202... 

Cyanogen bromide reacts with the benzothiazinedithione (27) to yield the thiocyanato derivative (28) however, this product is unstable in contact with triethylamine and air and gradually yields a mixture of the sulfide (29) and disulfide (30) (75MI22700). 

Mercuric cyanide, when heated strongly in the absence of air, yields cyanogen (CN)2 and mercury. The salt is only slightly dissociated in water and yields no precipitate of mercury salt with any reagent except hydrogen sulfide. 

If the reaction, say, with cyanogen chloride, is carried out in ether solution, ammonium chloride precipitates and is filtered off, and the cyanamide is procured as a syrup by allowing the ether solution to evaporate spontaneously and later as crystals by allowing the syrup to stand over sulfuric acid in a desiccator. Cyanamide may also be prepared by removing the component atoms of hydrogen sulfide from thiourea by means of mercuric oxide. Thionyl chloride effects the corresponding removal of water from urea. 

Hydrogen sulfide is of the order of toxicity of cyanogen and hydrocyanic acid. Some persons are much more susceptible to it than others. The U. S. Bureau of Mines reports 0.06 to 0.08 per cent as causing acute poisoning and 0.005 per cent as causing subacute poisoning, when mixed with air. 

Thiocyanate is a monovalent polyanion that has the formula SCN-. This anion is rarely found in wastewaters. However, cyanide-containing wastes or waters on contact with sulfides can form thiocyanates. On chlorination, thiocyanate could react with chlorine to form highly toxic cyanogen chloride, CNC1. Thiocyanate in water may be analyzed using 1. colorimetric method and 2. spot test. The latter method is a rapid spot test that can give semiquantitative results. Preserve samples at pH below 2 and refrigerate. 

B.13 2. B.14 3. A.01 3.A.02 3.A.03 3.A.04 3.B.05 3.B.06 3.B.07 3.A.08 3.A.09 3.A.10 3.A.11 Bis(2-hydroxyethyl)sulfide 3,3-Dimethyl-2-butanol Carbonyl dichloride Cyanogen chloride Hydrogen cyanide Trichloronitromethane Phosphorous oxychloride Phosphorous trichloride Phosphorous pentachloride Trimethyl phosphate Triethyl phosphate Dimethyl phosphate Diethyl phosphate... 

Bueb A process for removing cyanogen from coal gas by scrubbing with a concentrated aqueous solution of ferrous sulfate. A complex sequence of reactions occurs, involving the ammonia and hydrogen sulfide that are always present in coal gas the final product is a blue mud containing... 

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