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首页> 外文期刊>Plant and Soil >SOLUBILITY AND MOBILITY OF COPPER, ZINC AND LEAD IN ACIDIC ENVIRONMENTS
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SOLUBILITY AND MOBILITY OF COPPER, ZINC AND LEAD IN ACIDIC ENVIRONMENTS

机译：酸性环境中铜，锌和铅的溶解度和流动性

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Understanding the chemical speciation of metals in solution is necessary for evaluating their toxicity and mobility in soils. Soil samples from the Powder River Basin, Wyoming were extracted with distilled deionised H2O. Soil water extracts were subjected to chemical speciation to determine the relative distribution and chemical forms of copper (Cu), zinc (Zn) and lead (Pb) in acidic environments. As pyrite oxidised, the pH decreased from 6.6 to 2.4, concentration of dissolved sulfate (S-T) increased from 259 to 4,388 mg L-(1) and concentration of dissolved organic carbon (DOG) decreased from 56.9 to 14.4 mg L(-1). Dissolved Cu concentrations ranged from 0.06 to 0.42 mg L(-1) and dissolved Zn concentrations ranged from 0.084 to 4.60 mg L(-1). Dissolved concentrations of Pb were found to be 0.003 to 0.046 mg L(-1). Chemical speciation indicated that at near neutral pH, dissolved metal concentration in soil water extracts was dominated by DOC- metal complexes. At low pH, dissolved metal concentration in soil water extracts was dominated by free ionic forms (e.g. Cu2+, Zn2+, Pb2+) followed by ion pairs (e.g. CuSO40, ZnSO40, PbSO40). Results obtained in this study suggest that as soil pH decreased, the availability and mobility of metal ions increased due to the chemical form in which these metal ions are present in soil solutions.
机译：了解溶液中金属的化学形态对于评估其在土壤中的毒性和迁移性非常必要。怀俄明州粉河盆地的土壤样品用蒸馏去离子水提取。对土壤水提取物进行化学形态分析，以确定在酸性环境中铜（Cu），锌（Zn）和铅（Pb）的相对分布和化学形式。随着黄铁矿的氧化，pH从6.6降低到2.4，溶解硫酸盐（ST）的浓度从259增加到4,388 mg L-（1），溶解有机碳（DOG）的浓度从56.9降低到14.4 mg L（-1） 。溶解的铜浓度范围为0.06至0.42 mg L（-1），溶解的锌浓度范围为0.084至4.60 mg L（-1）。发现溶解的Pb浓度为0.003至0.046 mg L（-1）。化学形态表明，在接近中性pH的情况下，土壤水提取物中的溶解金属浓度主要由DOC-金属配合物控制。在低pH值下，土壤水提取物中的溶解金属浓度主要由游离离子形式（例如Cu2 +，Zn2 +，Pb2 +）和离子对（例如CuSO40，ZnSO40，PbSO40）决定。这项研究获得的结果表明，随着土壤pH值的降低，由于金属离子以化学形式存在于土壤溶液中，金属离子的有效性和迁移率也随之增加。

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