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| Characteristics of spatial-temporal distribution and risk assessment of Pb in oysters along the coast of Guangdong Province from 1989 to 2010 |
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Abstract Spatial-temporal distributions of Pb in oysters in Guangdong coastal waters were monitored from 1989 to 2010. The methods of single factor index and the non-carcinogenic hazard index were applied to access the hazard risk of Pb in oysters from the coastal waters. The concentration of Pb in oysters ranged from no detectable to 3.65mg/kg with an overall average of 0.41mg/kg, and showed a logarithmic normal distribution on the whole. Annual variations in the concentration of Pb in oysters decreased gradually and then tended to be stable with a weak ascending trend. The concentration of Pb in oysters dropped obviously from the coastal waters of eastern Guangdong and western Guangdong every five years, but which showed an obvious decrease from the Pearl River estuary over the period of 2006~2010. Moreover, spatial distribution of concentration of Pb in oysters varied in the following order: the Pearl River estuary> the west Guangdong coastal waters3 the east Guangdong coastal waters. The single factor index and non-carcinogenic hazard index of Pb in oysters were well below 1.0 according to all the related standards issued by China, EU and Hongkong, respectively, which indicated no possible hazard risk in consuming the oysters collected from Guangdong coastal waters.
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Received: 27 January 2011
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