Carbon disulphide analysis

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... 

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... 

In order to characterise the components further, mass spectral analysis was carried out. When head space volatiles from undigested cow slurry were analysed on a non-polar column the results (Figure 5) demonstrated the presence of several sulphur containing compounds—methanethiol, carbon disulphide, dimethyl sulphide, 2-propanethiol,... 

By rapidly cooling the fluid mixture it is possible to minimise the readjustment of the equilibrium and to attain a solid condition in which tire original proportions of the mixture are approximately retained in the solid state tire allotropic change is so very slow as to allow careful and fairly prolonged examination of the mixture. It is then found that, the normal mobile liquid constituent (S ) has given rise to crystalline sulphur, soluble in carbon disulphide, whereas the dark-coloured viscous constituent (S ) has produced an amorphous solid, insoluble in this solvent4 (see also p. 10). A rough analysis of molten sulphur in... 

Di-m-tolyl tellurium dichloride, (CH3.C6H4)2TeCl2,3 is formed when di-m-tolyl telluride in ether solution is chlorinated. The product appears as needles, sintering at 128° C. and melting at 131° to 132° C., readily soluble at the ordinary temperature in benzene, toluene, xylene, carbon disulphide, chloroform or carbon tetrachloride, less soluble in methyl or ethyl alcohol, insoluble in petroleum. When the dichloride is boiled with water a white powder separates on cooling this melts at 87° C. to a viscous oil which gradually becomes watery. Analysis shows this product to be a basic salt and not the anhydride. 

Chromatographic Analysis.—Chromatographic adsorption-analysis, the most delicate method of separation of closely related compounds, depends on the simultaneous adsorption and separation of mixtures of organic compounds, such as natural dyes, biochemical products, isomerides, hydrocarbons, etc., in suitable solvents such as petroleum, ether, chloroform, carbon disulphide and water. 

The amorphous by-product mentioned above, on analysis, gave numbers agreeing with the formula C3N3S3 it is a very finely-divided, yellow powder, is extremely hygroscopic, and obstinately retains traces of carbon disulphide and nitrogen pentasulphide. It dissolves without alteration in concentrated sulphuric acid, and has properties similar to those of pseudocyanogen sulphide, CaNaS3H. 

The OVM 3500 monitor was applied by Cohen et al. (1989) to determine VOC concentrations in a study of 35 homes in West Virginia, USA. Samplers were placed in the main bedroom at a height of approximately 1.5 m, and outdoors in a specially fabricated aluminum shelter that kept the sampler dry. They were exposed for one 3 week period before analysis by solvent desorption using 1.5 ml carbon disulphide and analysis with GC-FID. Results for indoor concentrations of some of the 17 compounds reported are shown in Table 3.2. 

Staszewski, R., Pompowski, T., Janak, J. Analysis of a mixture of carbon dioxide, hydrogen sulphide, carbonyl sulphide, carbon disulphide and sulphur dioxide by gas-liquid chromatography. Chem. Anal. 8, 897 (1963). — Chem. Abstr. 60, 15141 (1964). 

A solution containing 1 mg of a free base in 1 ml of ethyl acetate was shaken with 0.5 ml of carbon disulphide for 30 min. Under reduced pressure the solution was evaporated to dryness and the residue dissolved in 1 ml of ethyl acetate. Aliquots of 1 pi were taken for analysis. For phenolic and indolic amines 100-pg aliquots of isothiocyanate derivatives are subjected to reaction with a mixture of BSTFA and TMCS (99 1) at 90°C for 15 min. 

Ruhman S, Nelson KA. Temperature-dependent molecular dynamics of liquid carbon disulphide polarization-sensitive impulsive stimulated light-scattering data and Kubo line shape analysis. J Chem Phys 1991 94 859-867. 

Analysis of wines from different chateaux and different harvests showed that there are always high doses of carbon disulphide when this molecule is present, although a correlation was not established (Fig. 10.5). 

Campbell L, Jones AH, Wilson HK. 1985. Evaluation of occupational exposure to carbon disulphide by blood, exhaled air, and urine analysis. Am J Ind Med 8 143-153. 

A quantitative analysis 104> of the n.m.r. spectra of [16]annulene between 0 °C and —150 °C (in carbon disulphide/perdeuteriotetrahydro-furan) has yielded the result that in solution a dynamic equilibrium exists between two configurations of the compound 16a and 16b probably via other intermediate conformations. 

Solvent desorption. Samples are collected on glass tubes containing 100-200 mg of 20-40 granular charcoal adsorbents made from coconut shells. Solvents such as carbon disulphide, dichloromethane or hexane (2-5 ml) are used to desorb the analytes followed by capillary column analysis. Many applications using charcoal adsorbent tubes are reported in the literature [55,56]. 

Proton NMR analysis has been employed for structiue determination of dihydrofurans obtained as reaction intermediates. It has thus evidenced the formation of cis- and (ra s-2,5-dichloro-2,5-dihydrofuran, (ran5-2,3-dichloro-2,3-dihydrofuran, and cis-2,3-tran5-4-cw-5-tetrachlorotetrahydro-furan in the addition of molecular chlorine to furan in carbon disulphide <8401 >. The structures of the six adducts isolated in the reaction of methyl 2-furoate with acetyl nitrate, in their (Z)- and ( )-configurations, have been estabhshed <84JOCl636>. 

An AT-ray crystal structure analysis has shown that the product of the reaction of CFs Rh(CO)6 with carbon disulphide is (0Q4ReS2CS[Re(CX ))4]2SCS2Re(C 0)4. The displaced trifluoromethyl groups were found as hexafluorothioacetone in the reaction mixture. ... 

Alternatively, the steroid (10is dissolved in 1,1,3,3-tetramethyldisilazane (10/rl) and DMCS (10/il of a 20% solution in benzene) and incubated for 12 h in a sealed tube at 40 °C. Again, samples may be injected directly, or the reaction mixture may be evaporated to dryness, the derivative being dissolved in carbon disulphide for analysis [39],... 

Into a series of 10 ml measuring flasks respectively 0 (ref.), 25,50,100 and 150mg of glycerol trielaidate is weighed accurately and each sample is made up to 200mg with glycerol tristearate. Each of these mixtures is dissolved in carbon disulphide and made up to the mark at 20 C. The analysis should be performed with solution, cells and spectrophotometer as near as possible to 20 °C. 

There is no suitable solvent for IR spectroscopy which is sufficiently transparent over the whole range from 4000 to 400 cm". Between 4000 and 900 cm carbon tetrachloride is frequently used, and between 1400 and 400 cm"l carbon disulphide. Below 400 cm"i or 25 pm all the main solvents are sufficiently transparent. If the substance does not dissolve to an adequate extent, solvents such as n-hexane, chloroform or dimethyl formamide may be used. Water should be avoided as a solvent. In cases where this proves impossible, spectroscopy may also be performed with aqueous solutions with the aid of certain manipulative measures. The simplest is to saturate the solution with NaCl or KBr, the same material as the windows. Should this be chemically undesirable, the analysis should be conducted without cuvettes. 

A convenient way of storing and purifying the strained olefin bicyclo[2,2,0]hex-l(4)-ene is by formation of a platinum complex (776), whose structure has been confirmed by 2f-ray analysis. The olefin is readily liberated from (776) by carbon disulphide and undergoes the expected Diels-Alder reaction with cyclopentadiene. Addition of ethanol to (776) is accompanied by opening of the strained internal bond to give the metallocycle (777). ... 

In the qualitative analysis of iodide and bromide ions, the halogen is set free in aqueous medium. The solution is then shaken with a few drops of carbon tetrachloride or carbon disulphide, when most of the halogen passes into the organic solvent. The... 

Marcet and Berzelius (working in Marcet s private laboratory) showed that alcohol of sulphur is a compound of sulphur and carbon (carbon disulphide), a result which was anticipated in publication by Vauquelin. Marcet froze mercury by the rapid evaporation of ether under an air pump later he used carbon disulphide. He described an alcohol-oxygen blowpipe flame the oxy-hydrogen blowpipe had been described by Hare. Marcet s paper on the analysis of sea and lake waters contains a great number of results. In a later paper he showed that sea water does not contain mercury, as Rouelle had stated (see p. 77) he noticed the crystallisation from the residual brine of the double salts carnallite (KMgCls, 6H2O) and schonite (K2Mg(S04)2, fiHjO), but did not determine the quantitative compositions. 

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