Arsenic fractionation and contamination assessment in sediments of thirteen lakes from the East Plain and Yungui Plateau Ecoregions, China
huoshouliang
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Received November 20, 2013,Revised January 08, 2014, Accepted January 10, 2014, Available online 2014-03-20
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Arsenic (As) fractions in the sediments of seven lakes from East Plain Ecoregion and six lakes from Yungui Plateau Ecoregion, China, were investigated and the differences of As fractionation in different lakes was discussed. Results indicated that the total As concentrations in sediment samples of lakes of the East Plain Lake Ecoregion are higher than those of Yungui Plateau Lake Ecoregion. Residual As is the main fraction in sediment samples of lakes from both ecoregions, followed by Reducible As and Soluble or Oxidizable As. The total As is correlated to oxidizable As and residual As in sediment samples from both lake ecoregions. Arsenic distribution in sediment samples of lakes of the East Plain Ecoregion appear to be affected by human activity, while the As origin mainly comes from natural sources in sediment samples of lakes in the Yungui Plateau Ecoregion. The potential ecological risk index (RI) and geoaccumulation index (Igeo ) values suggest “low to moderate” risk degree and “unpolluted to moderately polluted” for As in the studied lake sediments.
