By Tebbett, I.
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The main components which make up a gas chromatograph have been described in Chapter 1. Briefly, separation of injected compounds is achieved by using a column Sec. 31 Columns 37 which is kept in a temperature controlled oven and through which a carrier gas, usually nitrogen, passes. The columns range from glass packed columns to different types of capillary columns, with several different packings or stationary phases. Once separation has been achieved on one of these columns the compounds pass into a detector.
Gluechauf, E. (1955), Zen exchange and its applications, Sot. of Chem. , London, 34. E. J. , eds, Academic Press, New York, 1-13. E. , Butterworths, London, 36-55. Grob, K. & Grob, G. (1972), Methodik der Kapillar-Gas-Chromatographie Hinweise zur vollen Ausnutzung hochwertiger Saulen: Teil 1, Die Direkteinspritzung, Chromatographia, 5 3312. 26 Forensic gas chromatography [Ch. 1 Grob, K. , jr. (1978), Splitless injection and the solvent effect, J. High Resolut. Chrom. and Chrom. , 2 57-64. , Langlais, R.
The examination of commercial products is usually straightforward, because the compounds of forensic interest are generally few and in most cases easily extracted from the tablet matrix. As always, there are exceptions which can cause problems, for example pharmaceutical products which contain multiple constituents. The most common form of sample which enters the forensic drug laboratory apart from standard dosage forms are unknown powders. Whether the powder is in the form of cocaine mixed with other local anesthetic agents, or mixtures of sympathomimetic amines, special considerations must be made before any chromatographic analysis is possible.