Gas chromatography, reaction

Polymers being with few exceptions, solid substances, cannot be directly analysed using gas chromatography. However, it is possible by the application of well-controlled chemical reactions to decompose polymers to simpler volatile substances that are amenable to gas chromatography and thereby one can obtain information concerning the original polymer. 

A further special case of reaction gas chromatography involves pyrolysis (or photolysis) of the polymer in the absence of oxygen (Section 3.7) and examination of the volatiles produced by gas chromatography to provide information on the structure of the original polymer. 

Further complementary techniques can be applied to obtain even more information. Thus PGC can be coupled with mass spectrometry or NMR spectroscopy. 

Ester groups occur in a wide range of polymers, e.g., PET. The classic chemical method for the determination of ester groups, namely saponification, can be applied to some types of 

Anderson and co-workers [16] used combined Zeisel reaction and gas chromatography to analyse acrylic copolymers. Acrylic esters were cleaved with hydriodic acid and gas chromatography was used for analysing the alkyl iodides so formed  

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Boos, R., Prey, T. Begert, A. (1985) Determination of volatile chlorinated hydrocarbons by reaction gas chromatography. J. Chromatogr, 328, 233-239 (in German)... 

Continuous reaction gas chromatography The dehydrogenation of cyclohexane over Pt/g-A1203 (with A.W. Wardwell and R.W. Carr, Jr.). American Chemical Society Symposium Series no. 196. Washington, D.C. American Chemical Society (1982). 

A. Oomens and L. Noten, Picomole amounts of methyl chloride by reaction gas chromatography, HRC CC J. High Res. Chromatogr. Chromatogr. Commun., 7 280(1984). 

Continuous Reaction Gas Chromatography The Dehydrogenation of Cyclohexane over Pt/y-Al203... 

V. G. BEREZKIN Analytical Reaction Gas Chromatography, Plenum, New York, 1968. 

Pacakova, V., Konas, M., and Kotvalova, V. (1985) Reaction gas chromatography study of the photodecomposition of selected substances, Chromatographia, 20, 164-172. 

Koh I-O, Rotard W, Thiemann W (2002) Analysis of chlorinated paraffins in cutting fluids and sealing materials by carbon skeleton reaction gas chromatography. Chemosphere 47 219-227... 

COMPARISON OF ANALYTICAL REACTION GAS CHROMATOGRAPHY WITH CLASSICAL CHROMATOGRAPHY... 

Characteristic Classical phyacal chromatography Analytical reaction gas chromatography (physico-chemical chromatography)... 

Tliis is an example of how analytical reaction gas chromatography can be used for both elemental and isotopic analysis. The application of elemental analysis to radiochromatography was dealt with in great detail by Roberts [131]. 

The methods of analytical reaction gas chromatography, making use of the differences in the chemical, chromatographic and detection properties of the main and trace components, in some instances offer simple solutions even to such complex situations where, for example, the zone of the main component completely masks the trace zones. The general methods of analytical reaction GC, developed for trace analysis (with the assumption that the trace and main components have different reactivities) are listed in Table... 

A suitable technique for this purpose (concentration of trace components and their isolation in a new reaction) involves the use of a liquid bubbler. The applicability of this technique in analytical reaction gas chromatography was shown earlier [15] using as an example the preliminary concentration of hydrogen sulphide and carbon dioxide by means of an alkaline solution of sodium hydroxide through which a flow of the sample gas was passed. When the solution was acidified, the acidic traces formed a concentrated zone, and were separated on a chromatographic column. A liquid bubbler as illustrated in Fig. 8.3 was used to concentrate the trace components. 

Absorption spectrophotometry Fluorescence methods Atomic-absorption methods Flame photometry Neutron activation analysis Emission spectroscopy Spark source mass spectrometry Reaction gas chromatography of chelates using electron-capture detection... 

Finally, we should point out that the methods developed in recent years attest to the wider applicability of reaction gas chromatography to such non-traditional samples as cations and anions, reviewed in an excellent book [ 187]. 

Radziszewski reaction 24, 204s31 Raney catalysts s. Nidcel Rays s. Irradiation Reaction gas chromatography 24, 501S31... 

Kramer, R Simultaneous reaction gas chromatography with a reversible first order reaction I. J. Chromatogr. 1975,107 (2), 241-252. 

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