Abstract
Blood samples from 738 employees of the Southern California Edison Company were analyzed for PCBs prior to their starting work, as part of a pre-employment medical examination. Blood PCB concentrations of the pre-employment sample had a median of 4 ppb and a mean of 5 ± 4 ppb. These data are comparable to previously published values for blood PCB concentrations in people without occupational exposure. Plasma PCB concentrations are also sorted by demographic characteristics of the sample (age/race/sex/education). Since the demographic properties of the newly hired employees are reasonably similar to those of the Los Angeles—Long Beach work force, as determined in the 1980 census, we conclude that the low PCB concentrations present in the blood of a sample of new electric utility employees is representative of the regional work force and arise from exposures to PCBs present in the general environment.
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