Heavy Metal Monitoring Using Bivalved Shellfish from Zhejiang Coastal Waters, East China Sea |
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Authors: | H Huang J Y Wu J H Wu |
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Institution: | (1) College of Marine Science & Technology, Shanghai Fisheries University, Shanghai, 200090, China;(2) School of Environmental Science & Technology, Tongji University, Shanghai, 200092, China;(3) East China Sea Environment Monitoring Center, State Oceanic Administration, Shanghai, 200137, China;(4) Department of Environment, University of Massachusetts, Amherst, MA 01003, USA |
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Abstract: | The interest of culturing bivalved shellfish (including mussels, clams, oysters etc.), has increased in recent years, but
the consumption has been hampered both by high levels of heavy metals and toxic algae. The levels of heavy metals (Hg, Cd,
Pb, Zn, Cu and As) were determined in soft tissues of different shellfish from Zhejiang coastal waters, East China Sea. The
average concentrations of the heavy metals analyzed exhibited the following decreasing order: Zn > Cu > As > Cd > Pb > Hg.
Comparison of heavy metals concentrations among species indicated that Bivalves clearly have significant potential as useful
bioindicators; however, the results indicated that no one species is universally suitable, as is true of any organism used
in these studies. The distribution of the metals was also investigated along the Zhejiang coast, which the results showed
the mean concentration of Hg and Cd detected did not vary greatly and presented a similar spatial pattern at different sampling
stations, the concentrations of Zn and Pb were highly variable at different sampling sites. The amounts of heavy metals in
soft tissue of shellfish were also compared with those from the related species from other seas in China and world marine
waters. The results suggested that the coastal area might be considered relatively unpolluted with heavy metals and the concentrations
of metals in shellfish also below the seafood safety limits for human consumption. |
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Keywords: | heavy metals bivalved shellfish bioindicator maximum allowable concentration Zhejiang coastal waters East China Sea |
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