The role of biotic and abiotic degradation processes during the formation of typical toxaphene peak patterns in aquatic biota

Toxaphene residues in cod liver and fish oil samples from different countries have been analyzed by HRGC-ECD and HRGC-MS as well as with multidimensional gas chromatography. The results have been compared to patterns obtained by photolysis and microbial degradation of selected single chlorobornanes and technical toxaphene. Enantiomeric ratios of the components Parlar [num ]44 and [num ]62 showed significant deviations from 1, indicating metabolism in cod fish and perhaps other species at least for some congeners. Parlar [num ]50 was found to be a racemate, which corresponds to its known stability under biotic and abiotic conditions.