Abstract
Inorganic mercury tracer, 197Hg(NO3)2, and organic mercury tracer, CH3, 203HgCl, were given to 15- and 20-day pregnant rats. The tissues investigated from 16 pregnant rats were decidua, yolk sac, placenta, and fetus. Tissues were taken as soon as 5 minutes after an intravenous maternal injection, as late as 120 hours for the 15-day-pregnant rats and as late as 24 hours for the 20-day-pregnant rats. The two mercury tracers were given simultaneously, and the percentages of the injected doses in the tissues were determined by gamma counting. Fetal uptake of methyl mercury was greater than that of mercuric nitrate at both 15 and 20 day's gestation. Decidual tissue showed a comparatively low and constant uptake of both mercury tracers, while the percentage uptake of inorganic mercury by the yolk sac was higher than for methyl mercury.
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