The solid-solution partitioning of heavy metals (Cu, Zn, Cd, Pb) in upland soils of England and Wales.
The solid-solution partitioning of heavy metals (Cu, Zn, Cd, Pb) in upland soils of England and Wales.
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DOI：
10.1016/s0269-7491(03)00058-7
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发表时间：
2003-09
影响因子：
8.9
通讯作者：
E. Tipping;J. Rieuwerts;Gang Pan;Gang Pan;Mike Ashmore;S. Lofts;M.T.R. Hill;M. Farago;
中科院分区：
文献类型：
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作者：
E. Tipping;J. Rieuwerts;Gang Pan;Gang Pan;Mike Ashmore;S. Lofts;M.T.R. Hill;M. Farago;
从英格兰和威尔士的高地，98个表层土壤取样，并分析了烧失量（LOI），总和溶解的盐基阳离子，铝，铁，和微量重金属（铜，锌，镉，铅）。样品涵盖了广泛的pH值（3.4-8.3）和LOI（9-98%）范围。用0.43 mol l− 1HNO 3和0.1 mol l− 1 EDTA提取的土壤金属含量非常相似，通常低于用浓硝酸和高氯酸混合物提取的值。土壤溶液中重金属总量与土壤金属含量和[DOC]呈正相关，与pH和LOI呈负相关，相关系数r 2在0.39（Cu）~ 0.81（Pb）之间。采用平衡形态模型WHAM/Model VI计算的游离金属离子（Cu ~（2+）、Zn ~（2+）、Cd ~（2+）、Pb ~（2+））浓度进行多元回归分析，得到了较强的相关性（r ~ 2 =0.76-0.95）。游离金属离子浓度与MHNO 3成正相关，与pH和LOI成负相关。用WHAM/Model VI描述固溶体相互作用和溶液形态;这涉及通过调整“活性”腐殖物质的含量来校准每个土壤样品以匹配观察到的土壤pH。校准的模型提供了土壤溶液中总重金属浓度的合理预测，和预测的游离金属离子浓度是在合理的协议从溶液中获得的值只形态计算。
Ninety-eight surface soils were sampled from the uplands of England and Wales, and analysed for loss-on-ignition (LOI), and total and dissolved base cations, Al, Fe, and trace heavy metals (Cu, Zn, Cd, Pb). The samples covered wide ranges of pH (3.4–8.3) and LOI (9–98%). Soil metal contents measured by extraction with 0.43 mol l−1HNO3and 0.1 mol l−1EDTA were very similar, and generally lower than values obtained by extraction with a mixture of concentrated nitric and perchloric acids. Total heavy metal concentrations in soil solution depend positively upon soil metal content and [DOC], and negatively upon pH and LOI, values of r2ranging from 0.39 (Cu) to 0.81 (Pb). Stronger correlations (r2=0.76–0.95) were obtained by multiple regression analysis involving free metal ion (Cu2+, Zn2+, Cd2+, Pb2+) concentrations calculated with the equilibrium speciation model WHAM/Model VI. The free metal ion concentrations depend positively upon MHNO3and negatively upon pH and LOI. The data were also analysed by using WHAM/Model VI to describe solid–solution interactions as well as solution speciation; this involved calibrating each soil sample by adjusting the content of “active” humic matter to match the observed soil pH. The calibrated model provided fair predictions of total heavy metal concentrations in soil solution, and predicted free metal ion concentrations were in reasonable agreement with the values obtained from solution-only speciation calculations.