PCBS AND OTHER ORGANOCHLORINES IN HUMAN TISSUE SAMPLES FROM THE WELSH POPULATION .1. ADIPOSE

The general exposure of humans to polychlorinated biphenyls (PCBs) and Sigma DDT (i.e., p,p'-DDT + p,p'-DDE + p,p'-DDD) in Wales (UK) was determined through the analysis of adipose tissue samples collected from 75 individuals during post-mortem examinations in 1990-1991. Fifty PCB congeners were screened of which 29 were identified in mast of the samples. Congener IUPAC numbers 138, 153 and 180 were the most abundant compounds, accounting for an average of 55% of the Sigma PCB congeners analysed Sigma PCB concentrations varied between 0.2 and 1.8 mu g g(-1) of adipose tissue and were positively cor related with the donors age and negatively associated with the percentage of lipid in the adipose tissue. A progressive change in the congener pattern was noted with increasing subject age. Tissue from older individuals generally contained a relatively high proportion of the more persistent and higher chlorinated congeners. Sigma DDT concentrations ranged from 0.11 to 5.6 mu g g(-1) adipose tissue, with p,p'-DDE contributing 96% towards the Sigma DDT concentration. Sigma DDT levels were also positively correlated with age. No significant differences in the Sigma PCB and Sigma DDT concentrations were noted between males and females, between people living in rural and urban locations or with the subjects' body weight at the time of their death.