土壤对重金属吸附影响因素的分析研究
首发时间:2009-04-09
摘要:重金属元素在土壤中的吸附及反应极为复杂,受多方面的而影响。土壤对重金属的吸附以来于土壤的类型,物理化学性质,也与重金属扽生的特性有关。本文主要对土壤中重金属(Cu2+、Zn2+、Pb2+、Mn2+)的吸附以及影响因素(pH值、吸附时间、外加有机酸)做一个简单的研究。当pH值为3时,土壤对重金属铜的吸附可以达到最大量;土壤对重金属的吸附在3小时以后能基本达到平衡,并且吸附量随着重金属浓度的增加而增加;有机酸的添加(苹果酸、乳酸、柠檬酸、草酸)对土壤吸毒重金属离子的影响不同。实验所用的四种有机酸不同程度的削弱了土壤对Mn2+的吸附,对土壤吸附Zn2+影响不大;其中苹果酸、乳酸、草酸能促进土壤对对Pb2+的吸附,而柠檬酸的作用则相反;乳酸能促进土壤对铜的吸附,而草酸的加入则相反。
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Adsorption of Heavy Metals by Soils and
Abstract: The adsorption of Heavy metal in soil is very complicated and always influenced by all kinds of factors. Heavy metals adsorption by soil depends not only the nature of soil, but also heavy metals themsevles. This articals simply researches affecting actors of the adsorption of heavy metals by soil, including pH, hours, the added organic acid and so on. We found that the adsorption of heavy metals by soil reach the maximum when pH was 3 and bring into aquilibrium after 3 hours, the adsorption increased with the increasing heavy metal concentration. The added organic acid(malic acid, lactic acid, citric acid, oxalic acid) in the soil had different impact on adsorption of heavy metals. Four different organic acids used in this experiment weaken the soil adsorption of Mn2+, have little effect on Zn2+; malic acid, lactic acid, oxalic acid enhanced soil adsorption of Pb2+, on the contrary, the citric acid have the opposite effect; Lactic acid can promote the adsorption of copper in soil but oxalic acid.
Keywords: heavy metals adsorption soil affecting actors
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No.3122145814312392****
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