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Treatment of actived carbon for the determination of the group parameters AOS and AOX in waterIn der Wasseranalytik gewinnen neben dem Gruppenparameter AOC1 auch die Parameter AOBr, AOF und AOS immer mehr an Bedeutung. The polychlorinated biphenyls (PCBs) are a group ofxenobiotic chemicals that have attracted concern because of their worldwide distribution, their persistence in the environment, and their 1988 biological and human health effects. PCB molecules consist of a biphenyl nucleus carrying 1 to 10 chlorine atoms. Thus, there are 209 possible congeners ranging from the three monochlorobiphenyls to decachlorobiphenyl. The physico-chemical and biological properties of these molecules only depend on the number and positions of chlorine atoms on the biphenyl nucleus.Thus, the aim of the present study was to show that the highresolution capillary gas chromatographic behaviour of the 209 possible chlorinated biphenyls can be described by a simple coded numerical method of the chlorine substitution patterns. ExperimentalThe experimental GLC retention times (RT) relative to the standard, octachloronaphthalene, for the 209 PCBs were taken from the literature [1].

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