Abstract
We have characterized the spectrum of PCB contaminants in human milk samples from 95 women in Kazakhstan using GC/MS congener specific analysis. In these samples, 12 PCBs comprised 83% of total PCB concentration, and were similar to the major PCBs reported in other published human milk studies. By summing concentration levels of 80 PCB congeners in the Kazakhstan samples, a mean total PCB concentration of 368 ng/g fat was obtained. This is lower than levels reported in human milk samples from Western Europe. Six indicator PCBs were summed in Kazakh milk samples; their aggregate value was similar to literature values published for human milk from the former Soviet Union. Using WHO's recent TEF scheme, the mean sum of PCDD/F, coplanar PCB, mono-ortho PCB, and di-ortho PCB TEQ is 42 pg TEQ/g fat.
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