EDTA对土壤渗滤液中TOC和重金属动态变化的影响  

Leaching of TOC and Heavy Metals from a Polluted Soil as Affected by Addition of EDTA

作　　者：王学锋[1] 冯颖俊[1] 皮运清[1] 崔倩[1] 师东阳[1] 崔英[1] 

机构地区：[1]河南师范大学化学与环境科学学院,河南省环境污染控制重点实验室,河南新乡453007

出　　处：《土壤》2007年第4期573-576,共4页Soils

基　　金：河南省环境污染控制重点实验室项目资助。

摘　　要：通过盆栽试验研究了EDTA对土壤渗滤液中总有机碳(TOC)和重金属动态变化的影响。结果表明,施用EDTA极显著地增加了土壤渗滤液中TOC含量,土壤渗滤液中TOC含量随淋洗量呈指数曲线下降。在加入EDTA48天后,土壤渗滤液中TOC含量仍然高于对照处理。施用EDTA大幅度地增加了土壤渗滤液中Cd、Ni的浓度,其浓度在1个月内迅速下降,以后趋于稳定。用EDTA强化重金属污染土壤的修复存在淋溶迁移的环境风险。防止因EDTA施用而引起地下水污染的关键时期在EDTA施入后的2周内。A pot experiment was conducted to study effect of addition of EDTA on leaching of the Total Organic Carbon (TOC) and heavy metals from a polluted soil. Results indicated that, EDTA extra-remarkably increased the concentration of TOC in the soil leachate. The concentration, however, declined, showing an exponential curve, along with the increasing volume of leachate. On day 48 after the addition of EDTA, it was still higher than that in the control. EDTA increased the concentrations of Cd and Ni by a large margin; but they dropped rapidly within 1 month and then leveled off. The use of the EDTA technology does have an environmental risk of heavy metals migrating into the groundwater. The crucial time to prevent pollution of ground water in applying the EDTA technology is the first two weeks after its addition.

关 键 词：EDTA 土壤 淋溶 TOC 重金属 环境风险 

分 类 号：X820.4[环境科学与工程—环境工程]