ACCUMULATION OF HEAVY METALS IN BIVALVES UNDER EXPERIMENTAL CONDITIONS

Accumulation of lead in Meretrix lyrata was studied under laboratory conditions. Each experiment on the dilution of Meretrix lyrata and its exposure to water with different levels of lead (C = 0,003; 0,05; 0,1; 0,3; 0,4; 0,6 mg/l). The lead content in Meretrix lyrata was analyzed after 10, 15, 20, 25, 30 days marked that, the concentrations of lead in Meretrix lyrata in all reservoirs (except C = 0,6 mg/l) gradually increased with the exposure time. After 25 days of exposure of individuals in water with a concentration C = 0,6 mg/l, about 20 % of Meretrix lyrata individuals died, after 30 days 100 %. After 10 days of incubation closure Meretrix lyrata in clean sea water Pb practically deduced and about 30% remained in Meretrix lyrata, regardless of the number Pb, initially accumulated. The results obtained can be assumed as the basis for investigating lead accum lation and its excretion by clam Meretrix lyrata organisms grown in artificial conditions.