Carbon Disulphide in air

Cadmium and inorganic compounds of cadmium in air (X-ray fluorescence spectroscopy) Chromium and inorganic compounds of chromium m air (atomic absorption spectrometry) Chromium and inorganic compounds of chromium m air (X-ray fluorescence spectroscopy) General methods for sampling and gravimetnc analysis of respirable and mhalable dust Carbon disulphide in air... 

Several examples of the applications of polarography in these fields have been already mentioned in Chapters VI and VII, viz. determinations of benzene, toluene, naphthalene and phenols in the atmosphere, breath, blood or urine, of amino acids (with particular interest to tyrosine, tryptophane, phenylalanine, histidine and histamine), of ketoacids, ketosteroids, carbon disulphide in air and blood, ethanol, acetoin, sugars and morphine in blood, of lactic acid, mandelic acid in bile and urine, adrenaline and thyroxine in iodinated proteins and last, but not least, of thiol compounds, both soluble and bound in biological materials. A few further examples will be given here. 

Preparation of Phosphonium Iodide. Perform the experiment in a medium of dry carbon disulphide. Carbon disulphide is poisonous and readily ignites, its mixture with air is explosive. Work with it requires great care and attention. Distil carbon disulphide in a water bath in the absence of an open flame )... 

Tri-n butyIphosphine boils at 149-5 C. (corr.) at 50 mm. pressure and has a density of 0-8118 at 25° C. It is a colourless liquid having the characteristic phosphine odour. With alcohol, ether and benzene it is miscible in all proportions, but immiscible with water its mob ecular weight in freezing benzene is normal. It is less readily oxidised than the lower tertiary phosphines. W hen boiled m a current of air it is converted into the oxide. It combines with carbon disulphide in cold absolute alcohol solution, the addition product melting at 65-5° C. (corr.). This latter product is completely dissociated in hot ether or alcohol solution. A mercwic chloride addition compound is known, but it forms only a plastic mass, difficult to purify. The phosphine combines mth methyl and ethyl iodides, yielding alkyltri- z-butylphos-phomum iodide. 

Carbon disulphide is a volatile, evil-smelling liquid, although if carefully purified, the unpleasant smell is removed, as it is due to impurity. The vapour is inflammable and can form explosive mixtures in air ... 

MDHS 14 General method for the gravimetric determination of respirable and total dust MDHS 15 Carbon disulphide MDHS 16 Mercury vapour in air Laboratory method using hopcalite adsorbent tubes, and acid dissolution with cold vapour atomic absorption spectrometric analysis MDHS 17 Benzene in air Laboratory method using charcoal adsorbent tubes, solvent desorption and gas chromatography MDHS 18 Tetra alkyl lead compounds in air Continuous on-site monitoring method using PAC Check atomic absorption spirometry... 

Salts of O-alkyldithiocarbonatcs ( xanthates ) are hazardous as dusts, forming explosive suspensions in air. The lower-alkyl salts are claimed to be explosive in the solid state when dry [1]. Explosions reported when drying hydrated xanthate salts are probably the consequence of release of carbon disulphide to form an inflammable atmosphere of very low autoignition temperature in the oven [2], Xanthate esters are thermally unstable by a variety of eliminations and rearrangements, all distinctly exothermic and many evolving extremely flammable gases and vapours. Free xanthic acids, which may be isolated on acidification, decompose autocatalytically and perhaps explosively [3],... 

Tris trifluoromethyl phosphine bums in air, but, unlike its methyl analogue, has not so far been found to form addition compounds with sulphur, carbon disulphide or silver iodide. With chlorine it forms the addition compound P(CF3)3Cl2 (b.p. 94°), and there is some indication that an addition compound of lower stability may be formed with bromine. With either of these halogens at higher temperatures, partial replacement of CF3 by halogen occurs and a similar reaction occurs with iodine, yielding some P(CF3)2l and P(CF3)l2. 

Dipyridino-palladic Iodo-chloride, [Pd py2]IgCl2, crystallises in brown needles and is stable in the dry state in air. On boiling with potassium hydroxide complete decomposition takes place and a residue of palladous iodide remains. If shaken with pure carbon disulphide, two atoms of iodine are removed and dichloro-dipyridino-palladium remains.1... 

The iron oxide used in the purification of coal gas gradually becomes richer in sulphur and can repeatedly be revivified by exposure to air until the sulphur amounts to about 40 per cent., of the whole the mixture is then of greater value as a source of sulphur. The spent oxide, as it is commonly termed, is frequently applied to the production of sulphur dioxide or sulphuric acid, but the extraction of its sulphur by carbon disulphide has been effected as a successful commercial process using the system of counter-currents the mass is exhausted of sulphur, whilst a saturated solution of sulphur is obtained, from which the solvent can be distilled and returned to the extraction process. 

Carbon disulphide burns in air with a blue flame, producing carbon dioxide and sulphur dioxide. Moisture is not necessary for the combustion.7 It inflames at a lower temperature than ether. 

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