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ACCUMULATION AND RELEASE OF COMMON HEAVY METALS IN APOSTICHOPUS JAPONICUS

JIANG Hui-Chao;LIU Ai-Ying;SONG Xiu-Kai;LIU Li-Juan;Shandong Marine Fisheries Research Institute;Shandong Key Laboratory of Marine Ecological Restoration;  
We evaluated the kinetic parameters of biological accumulation and release of seven heavy metals(Pb, Zn, Cu, Cd, Cr, Hg and As) in respiratory tree, alimentary canal, and body wall of Apostichopus japonicus in two-compartment bioconcentration model in experiment. A. japonicus were exposed to water mixed with the seven heavy metals. The results show that the heavy metals were accumulated selectively in major organs and tissues in A. japonicus. The maximum concentrations of As, Cd and Cr in A. japonicus are in the order of respiratory tree alimentary canal body wall; for Cu and Zn: alimentary canal respiratory tree body wall; and Hg and Pb: body wall respiratory tree alimentary canal. Significant difference was observed in bioconcentration factor(BCF) among the seven heavy metals. The respiratory tree showed the strongest Cr-accumulation with BCF 2298.2, followed by Cu and Cd with BCFs 1500, and weaker accumulation in Hg, Pb, Zn and As. However, alimentary canal and body wall showed the strongest accumulation for Cu with BCFs 6037 and 1560.7, respectively, and then the weakest accumulation in As with BCFs 87.9 and 52.7, respectively.
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