PCBs and OCPs in human milk in Eastern Siberia, Russia: Levels, temporal trends and infant exposure assessment.
The aim of our study is to investigate the spatial distribution of polychlorinated biphenyls (PCBs), hexachlorobenzene (HCB), dichlorodiphenyltrichloroethane (p,p'-DDT) and its metabolites, α- and γ-isomers of hexachlorocyclohexane (HCH) in 155 samples of human milk (HM) from Eastern Siberia (six towns and seven villages in Irkutsk Region, one village of the Republic of Buryatia and one town in Zabaikal'sk Region, Russia), and to examine the dietary and social factors influencing the human exposure to the organochlorines. The median and range of the concentration of six indicator PCBs in HM in 14 localities in Eastern Siberia (114 (19-655) ng g-1lipids respectively) are similar to levels in the majority of European countries. However, in one village, Onguren, the median and range of levels of six indicator PCBs (1390 (300-3725) ng g-1lipids) were comparable to levels measured in highly contaminated populations. The Lake Baikal seals are highly exposed to persistent organic pollutants (POPs) and could be a potential source of PCB and DDT exposure in the Onguren cohort via the consumption of the Lake Baikal seal tissue. The location of food production in areas exposed to the emissions of local POP sources can also significantly influence POP levels in HM samples from industrialized areas. Estimated daily intakes (EDI) of HCH and HCB for infants are considerably lower or close to acceptable daily intake (ADI). The EDI of total DDTs and total PCBs are higher than ADI.
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, 664033, Favorsky Str., 1A, PO Box 421, Irkutsk, Russia. Electronic address: elenam@igc.irk.ru.
Elena A
EA
Mamontova
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, 664033, Favorsky Str., 1A, PO Box 421, Irkutsk, Russia.
Eugenia N
EN
Tarasova
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, 664033, Favorsky Str., 1A, PO Box 421, Irkutsk, Russia.
Alexander A
AA
Mamontov
D000818:Animals; D003634:DDT / Q000032:analysis / Q000378:metabolism; D004781:Environmental Exposure / Q000032:analysis; D005060:Europe; D005260:Female; D006581:Hexachlorobenzene / Q000032:analysis; D001556:Hexachlorocyclohexane / Q000378:metabolism; D006801:Humans; D006843:Hydrocarbons, Chlorinated / Q000032:analysis* / Q000378:metabolism; D007223:Infant; D008895:Milk, Human / Q000737:chemistry*; D011078:Polychlorinated Biphenyls / Q000032:analysis* / Q000378:metabolism; D012426:Russia; D046048:Seals, Earless; D012800:Siberia
D006843:Hydrocarbons, Chlorinated; D006581:Hexachlorobenzene; D001556:Hexachlorocyclohexane; D003634:DDT; D011078:Polychlorinated Biphenyls
Diet; Human milk; Organochlorine pesticides; PCB