서해 중부연안 갯벌에서의 저질 및 패류(Solen strictus Gould)중 중금속 분포특성

Heavy metal level and distribution in sediments and bivalves from the tidal flats along the mid-western coast, Korea, were investigated. The averages of heavy metal concentrations in sediments from 5 sampling sites ranged from 86.35-187.77mg/kg for Mn, 13.25-17.73mg/kg for Zn, 6.80-11.85mg/kg for Cr, 4.28-6.25mg/kg for Ni, 1.85-3.09mg/kg for Cu, 0.004-0.020mg/kg for Cd and 5.70-10.41mg/kg for Pb, respectively. Among the mussels of the limited body size(8.5-11cm), heavy metal concentration both in the flesh and in the whole soft parts were not strongly related to the body size. It was shown that, in S. strictus, Cu moves fast into the flesh after absorption, but Pb and Fe move very slowly. Overally, the heavy metal concentration in the flesh tends to increase with that in the whole soft parts. The concentration factors(heavy metal concentration in S. strictus/heavy metal concentration in sediment) showed that, of the examined metals, Cd is the most cumulative in the body of S. strictus, followed by Zn and Cu, while Mn, Cr, Ni and Pb are not cumulative.