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首页> 外文期刊>Journal of Soil Contamination >Copper, lead, cadmium, and zinc sorption by waterlogged and air-dry soil.
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Copper, lead, cadmium, and zinc sorption by waterlogged and air-dry soil.

机译：浸水和风干的土壤对铜，铅，镉和锌的吸附。

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Competitive sorption of Cu, Pb, Cd, and Zn was studied in three soils of contrasting chemical and physical properties under air-dry and waterlogged conditions. Competitive sorption was determined using the standard batch technique using six solutions, each with Cu, Pb, Cd, and Zn concentrations of～0, 2.5, 5, 10, 20, and 50 mg/litre. Waterlogged soils tended to sorb higher amounts of added Cu, Pb, Zn and Cd relative to soils in the air-dry condition, however this increase in sorption was generallynot statistically significant. The magnitude of sorption under both waterlogged and air-dry conditions was affected by the type and amount of soil materials involved in metal sorption processes, and competition between other metals for the sorption sites. Metal sorption was closely correlated with soil properties such as cation exchange capacity, organic carbon, and Fe and Mn hydrous oxides. Exchangeable Al reduced metal sorption due to its strong affinity for the sorption sites, and increases in exchangeable Mn enhanced Zn and Cd sorption. Heavy metal sorption was a combination of both specific and non-specific interactions. The extractability of Cu, Pb, Cd, and Zn under waterlogged and air-dry conditions was also studied. Three solutions containing these metals were mixed with each soil to achieve a final concentration of 0, 50, and 500 mg/kg. Each soil was extracted every 7 days using 1 M MgCl2 (pH 7) to determine metal extractability. Metal extractability initially decreased then increased due towaterlogging. The increased extractability of added metals was closely related to increased solubility of Fe and Mn which suggested that dissolution of Fe and Mn, oxides under reducing conditions caused a release of previously sorbed Cu, Pb, Cd, and Zn.
机译：在空气干燥和浸水的条件下，在三种化学和物理性质相反的土壤中研究了Cu，Pb，Cd和Zn的竞争性吸附。采用六批标准溶液测定竞争吸附，其中六种溶液的Cu，Pb，Cd和Zn浓度分别为0、2.5、5、10、20和50 mg / L。相对于在风干条件下，淹水的土壤倾向于吸收更多的添加的Cu，Pb，Zn和Cd，但是这种吸收的增加通常没有统计学意义。浸水和风干条件下的吸附量受金属吸附过程涉及的土壤物质的类型和数量以及其他金属之间对吸附位点的竞争影响。金属的吸附与土壤性质密切相关，例如阳离子交换能力，有机碳以及铁和锰的水合氧化物。可交换的铝由于其对吸附位点的强亲和力而降低了金属的吸附，而可交换的Mn的增加增强了Zn和Cd的吸附。重金属吸附是特异性和非特异性相互作用的结合。还研究了在浸水和风干条件下Cu，Pb，Cd和Zn的萃取能力。将包含这些金属的三种溶液与每种土壤混合，以达到0、50和500 mg / kg的最终浓度。每隔7天使用1 M MgCl2（pH 7）萃取每种土壤以确定金属的萃取性。由于浸水，金属的可萃取性最初下降，然后增加。所添加金属的增加的可萃取性与铁和锰的溶解度增加密切相关，这表明在还原条件下铁和锰氧化物的溶解会导致先前吸附的铜，铅，镉和锌的释放。

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