Intake of polychlorinated biphenyls (PCB) from the Finnish diet.

Concentrations of seven single PCB indicator congeners were measured in 99 food samples. These concentrations were converted into a total PCB content and used for estimating total PCB intake among Finns. The average intake from food is 15 micrograms/day or 0.25 mu/kg body weight per day, which showed no change during the late 1980s. Approximately half of the intake comes from fish. The composition of the PCB mixture varies a lot in different sample types, which emphasizes the importance of single compound determination.