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¹ Qingdao Agricultural University, College of Food Science and Engineering, Qingdao 266109, China
² Ocean University of China, College of Food Science and Engineering, Qingdao 266103, China DOI : 10.4194/1303-2712-v16_3_02 Viewed : 4321 - Downloaded : 3109 Ce³⁺ is a potential antagonist of Cd²⁺ due to their similar ionic radius. Its effect on the bioaccumulation of Cd²⁺ in pacific oyster Crassostreagigaswas explored through laboratory experiments. The oysters were exposed to 5, 10 and 25 μmol/LCe(NO₃)₃ in the presence of 25 μg/L Cd²⁺ (0.22 μmol/L) for 12 days and the concentrations of Cd, Ca, Zn as well as Cu were indicated in the whole soft tissues and separate organs. Ce³⁺ in all the three doses significantly inhibited Cd²⁺ bioaccumulation in the oysters on day 12 and the inhibition ratios reached 30%, 31% and 41% respectively. Organ-level analysis revealed that Ce³⁺ possibly exerted its inhibitory action by delaying the saturated absorption of Cd²⁺ in the gill. Ce³⁺ in all the three doses antagonized the negative effects of Cd²⁺ on Ca concentration and restored the its level to the normal range on day 12, but 25 μmol/L Ce³⁺ decreased the Zn and Cu concentrations by up to 27% and 88% respectively. It was concluded that Ce³⁺ could markedly inhibitthe Cd²⁺ bioaccumulation of Crassostreagigasand the presence of Ce³⁺ must be considered in marine pollution assessment by using oysters as the bioindicator. Keywords : Cerium, cadmium, bioaccumulation, marine bivalve