Assessment of metal contamination in the Hun River, China, and evaluation of the fish Zacco platypus and the snail Radix swinhoei as potential biomonitors
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The Hun River is a major tributary of the Liao River in the northeast area of China and provides drinking water for 23 million local residents. This study was designed to assess the severity of metal contamination in the Hun River and the potential use of indigenous organisms (the fish Zacco platypus and the snail Radix swinhoei) as biomonitors of metal contamination. Water, sediment, and the native fish and snails were collected at four sampling sites that differed in their physicochemical characteristics and their contamination levels. The samples were analyzed for Cd, Cr, Cu, Ni, Pb, and Zn by ICP-MS. The results showed that although the overall potential ecological risks of the metals were low at our sampling sites, Cd posed a noteworthy ecological risk. Strong correlations were obtained between Cd concentrations in the organisms and in the environment. The results indicated that Z. platypus and R. swinhoei can be useful biomonitoring species for assessing Cd contamination. Biomonitoring with the snail may be most effective when focused on the gonad/digestive tissue (because of the high metal accumulation there), but further work is needed to confirm this.
KeywordsMetal contamination Bioaccumulation Bioavailability Tissue distribution Zacco platypus Radix swinhoei
This research was supported by the National Nature Science Foundation of China (NSFC, 41303087; NSFC, 31270549) and the One-hundred Talent Program of the Chinese Academy of Sciences (Y2SBR111SS).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no competing interests.
Human and animal rights
All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.
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