The effects of mariculture activities on the adsorption/desorption and chemical fractionations of mercury on sediments

Liang, Peng; Wu, Sheng-Chun; Li, Yi-Chun; Li, Hong-Bo; Yu, Guang-bin; Yu, Shen; Wong, Ming H.

The effects of mariculture activities on the adsorption/desorption and chemical fractionations of mercury on sediments

2012

The aims of the present study were to investigate the effects of mariculture activities on inorganic mercury (Hg²⁺) adsorption/desorption on sediments and the distributions of newly adsorbed Hg²⁺ on different chemical fractionations. The adsorption amount and binding energy of Hg²⁺ on mariculture sediment (MS) were significantly higher (p<0.05) than reference sediment (RS). This may be explained by the strong complexation role that exists between Hg²⁺ and organic matter (OM), which derived from unconsumed fish feed and fish metabolites. The reducible Hg²⁺ in MS was significantly lower (p<0.01) than RS, which may have been caused by the decreasing amount of iron and manganese hydroxide in MS, lead to the decrease of Hg²⁺ bound to them. On the contrary, the residual Hg²⁺ was significantly higher (p<0.01) in MS than RS, which suggests that newly adsorbed Hg²⁺ was more stable in MS than RS.

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