Removal of Lead from Contaminated Soils with Chelating Agents
Removal of Lead from Contaminated Soils with Chelating Agents
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DOI：
10.2320/matertrans.m-mra2008825
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发表时间：
2008-10-01
影响因子：
1.2
通讯作者：
Aoki, Kenji
中科院分区：
文献类型：
--
作者：
Niinae, Masakazu;Nishigaki, Koudai;Aoki, Kenji
研究了生物可降解螯合剂[S，S，S]-乙二胺二琥珀酸（EDDS）、柠檬酸和低生物可降解螯合剂乙二胺四乙酸（EDTA）对土壤淋洗和电动处理去除铅的适用性。EDDS和EDTA对铅的去除效率在pH 7 ~ 10范围内都很高，EDDS在此pH范围内的除铅能力与EDTA相当。同时，在pH 4时，柠檬酸对铅的去除效率约为50%，并随着pH的增加而降低。因此，柠檬酸几乎没有用。在pH 4时，EDTA和柠檬酸对铅的去除主要是酸的作用，它们与铅之间的络合作用可以忽略不计，在室温下的电动试验中，EDTA比EDDS和柠檬酸更有效地促进铅在土壤中的电动迁移。[doi：10.2320/材料trans. M-MRA 2008825]
The biodegradable chelating agents [S,S,S]-ethylenediaminedisuccinic acid (EDDS), citric acid and the low biodegradable chelating agent ethylenediaminetetraacetic acid (EDTA) were investigated for their applicability for the removal of lead from soil by soil washing and electrokinetic processing.In the soil washing tests at 298 K, the removal efficiency of lead with EDDS and EDTA was high in the pH range from 7 to 10 and the ability of lead removal with EDDS in this pH region is comparable to that with EDTA. Meanwhile, the removal efficiency of lead with citric acid was approximately 50% at pH 4 and decreased with increasing pH. Therefore, citric acid was hardly useful. Acid contribution was predominant for the removal of lead with EDDS and citric acid at pH 4 and the complexation between these chelating agents and lead were negligible.In the electrokinetic tests at ambient temparature, EDTA was more effective than EDDS and citric acid for lead transport through the soil by electrokinetic processing. [doi: 10.2320/matertrans.M-MRA2008825]