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Effects of pH, chloride and calcium(II) on adsorption of monomethylmercury by soils

机译:pH,氯化物和钙(II)对土壤吸附单甲基汞的影响

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Adsorption of monomethylmercury (MMHg) by soil from 2×10~-7 and 1×10~-6 M solutions was investigated to understand soil-water partitioning of MMHg. The effects of three factors-pH, Cl~-, and Ca~2+--on adsorption were examined. Adsorption as a function of pH followed a concave downward profile with the maximum adsorption occurring at pH between 5 And 6. Less adsorption at low pH values mainly resulted from the proton competition for surface sites and Cl~- complexation for MMHg. Decreases in adsorption at high pH values are attributed to the complexation of MMHg with soluble organic ligands whose Concentrations increase with pH.
机译:考察了土壤在2×10〜-7和1×10〜-6 M溶液中对单甲基汞(MMHg)的吸附,以了解MMHg在土壤中的水分配。研究了pH,Cl〜-和Ca〜2 +-三个因素对吸附的影响。吸附随pH的变化呈凹面向下分布,最大吸附发生在5到6之间。在低pH值下吸附较少,这主要是由于质子竞争表面部位和Cl〜-络合MMHg。高pH值下吸附的减少归因于MMHg与可溶性有机配体的络合,其浓度随pH的增加而增加。

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