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Turkish Journal of Fisheries and Aquatic Sciences 2016, Vol 16, Num, 3     (Pages: 499-505)

Cerium Inhibits the Cadmium Uptake of Pacific Oyster Crassostrea gigas

Huang Guo Qing 1-2 ,Wang Dong Feng 2

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 : 2722 - Downloaded : 2133 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