Seasonal bioconcentration of heavy metals in Onchidium struma (Gastropoda:Pulmonata) from Chongming Island, the Yangtze Estuary, China
LI Xiaobo , JIA Linzhi , ZHAO Yunlong , WANG Qun , CHENG Yongxu
DOI:
Received March 03, 2008,Revised May 05, 2008, Accepted , Available online
Volume 21,2009,Pages 255-262
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The seasonal concentration changes of selected heavy metal Cd, Cr, Cu, Fe, Mn, Pb, and Zn in five tissues of marine gastropod
Onchidium struma were studied in the Chongming Island, the Yangtze Estuary in April 2007, July 2006, September 2006, and
November 2006, respectively. The results demonstrated that the bioconcentration factor of Cu (biomass/water) in all selected tissues was
about 104 magnitudes, Fe and Cd were 103, Zn was 102, and Mn, Pb, and Cr were 101. Hepatopancreas was proven to be the dominant
storage tissue of Cr, Cu, Mn, and Zn, whereas Fe and Pb were mainly stored in muscle and digenetic gland, and Cd was stored in
vitelline gland and albumen gland. Additionally, it was found that Cu, Fe, Mn, and Zn were concentrated significantly by O. struma
(whole-body) in summer or autumn, and Cd, Cr, and Pb increased slightly in spring and winter. Furthermore, the bioconcentration of
Cr was nearly 2-fold higher and Zn was 1.6-fold higher in the water compared with the Water Quality Standard for Fisheries. With
view of excessive amount of Pb, Cd, and Cu according to seafood standard, the consumption of O. struma might have the risk of health
hazard.
