Concentration of Heavy Metals in Molluscs and Sediment from Sei Jang Estuary

bekas penambangan bauksit dan Geloina sp lebih baik dijadikan sebagai indikator untuk logam Zn sedangkan untuk logam Cu dan Pb lebih baik digunakan Calliostoma sp.
Kata kunci : logam berat, sedimen, moluska, indeks akumulatif
Abstract
Concentrations of lead, copper and zinc were measured in molluscs (Geloina sp and Calliostoma sp) and
sediment samples collected from Sei Jang estuary Riau Indonesia. Concentrations of those metals in molluscs
were higher than in sediments, except for lead in Geloina sp which was slightly lower than sediments.
Geloina sp accumulates zinc more than threefold of the concentration in sediment, whilst Calliostoma sp
accumulates copper more than fourteen-fold of the sediment concentrations. Elevated concentrations of heavy
metals in an ex-bauxite mining area, dockyard and anthropogenic activities were found. Accumulation of
metals in molluscs varied between sizes where larger size accumulated more metals than smaller size indicating
that size is an important consideration for metal accumulation. Average accumulative indices indicated that
highest metals accumulation by molluscs occurred in the area of an ex-bauxite mining activities. These indices
also suggested that Geloina sp was better to be used as indicator organism for zinc, whilst Calliostoma sp was
considered to be suitable indicator organisms for the accumulation of copper and lead.
Key words : heavy metals, sediment, mollusc, Accumulative index
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Last update: 2021-02-27 10:38:24
Last update: 2021-02-27 10:38:24
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