Influence of the selective EDTA derivative phenyldiaminetetraacetic acid on the speciation and extraction of heavy metals from a contaminated soil.
Influence of the selective EDTA derivative phenyldiaminetetraacetic acid on the speciation and extraction of heavy metals from a contaminated soil.
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DOI：
10.1016/j.chemosphere.2014.02.039
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发表时间：
2014-08
期刊：
影响因子：
8.8
通讯作者：
Tao Zhang;Hang Wei;Xiuhong Yang;Bing Xia;Jun‐Min Liu;C. Su;R. Qiu
中科院分区：
文献类型：
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作者：
Tao Zhang;Hang Wei;Xiuhong Yang;Bing Xia;Jun‐Min Liu;C. Su;R. Qiu
为了避免土壤矿物质的过度溶解，需要开发更具选择性的螯合剂来洗涤重金属污染的土壤。通过使用一系列土壤洗涤条件和顺序提取的分批浸出试验，研究了用 EDTA 衍生物苯二胺四乙酸 (PDTA) 洗涤的污染土壤中铜、锌、铅和镍的形态和迁移率。在适当的洗涤条件下，PDTA 显着增强了从污染土壤中提取铜的效果。 PDTA 提取铜的主要机制是络合促进土壤铜的溶解和增加土壤有机质 (SOM) 的溶解。 PDTA 对 Cu(II) 相对于土壤成分阳离子（Ca(II)、Mg(II)、Fe(III)、Mn(II)、Al(III)）表现出高选择性，特别是在 PDTA 缺乏的情况下液土比较低的情况下，从而避免了土壤冲刷过程中土壤矿物质的不必要溶解，从而降低土壤结构并干扰未来的土地利用。与未冲洗土壤中的水平相比，PDTA 增强的土壤冲洗增加了 Cu、Zn 和 Pb 的可交换分数，并降低了它们的残留分数。
The development of more selective chelators for the washing of heavy metal contaminated soil is desirable in order to avoid excessive dissolution of soil minerals. Speciation and mobility of Cu, Zn, Pb, and Ni in a contaminated soil washed with phenyldiaminetetraacetic acid (PDTA), a derivative of EDTA, were investigated by batch leaching test using a range of soil washing conditions followed by sequential extraction. With appropriate washing conditions, PDTA significantly enhanced extraction of Cu from the contaminated soil. The primary mechanisms of Cu extraction by PDTA were complexation-promoted dissolution of soil Cu and increased dissolution of soil organic matter (SOM). PDTA showed high selectivity for Cu(II) over soil component cations (Ca(II), Mg(II), Fe(III), Mn(II), Al(III)), especially at lower liquid-to-soil ratios under PDTA deficiency, thus avoiding unwanted dissolution of soil minerals during the soil washing process which can degrade soil structure and interfere with future land use. PDTA-enhanced soil washing increased the exchangeable fractions of Cu, Zn, and Pb and decreased their residual fractions, compared to their levels in unwashed soil.