| EDTA对污染土壤水稳团聚体Cu Zn Pb的解吸作用 |
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| 引用本文： | 王曲漪,丁竹红,胡忻,张宇峰,尹大强.EDTA对污染土壤水稳团聚体Cu Zn Pb的解吸作用[J].农业环境保护,2012(7):1324-1329. |
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| 作者姓名： | 王曲漪 丁竹红 胡忻 张宇峰 尹大强 |
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| 作者单位： | [1]南京工业大学环境学院,南京211816 [2]南京大学现代分析中心,南京210093 [3]教育部长江水环境重点实验室,同济大学环境学院,上海200092 |
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| 基金项目： | 国家自然科学基金青年基金（20107026）;水体污染控制与治理重大科技专项（2008ZX07316-004） |
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| 摘 要： | 采用湿筛-离心法将采集自谷里铜矿矿区周边的重金属污染土壤筛分成不同粒径的团聚体,并用EDTA对原土和各粒径组分进行淋洗,旨在为进一步对矿区周边环境修复及风险评价提供参考依据。结果显示,粘粒级（〈0.002mm）团聚体颗粒具有相对较高的有机质（OM）含量、阳离子交换量（CEC）、游离氧化铝含量（Ald）和游离氧化铁含量（Fed）。Cu和Zn在粘粒级团聚体颗粒含量最高,而Pb在砂粒级〉0.2mm团聚体颗粒含量最高。Cu、Zn和Pb3种重金属在不同粒径团聚体的解吸规律相似,均表现出在粘粒级和细粉沙级团聚体解吸率最高,而在砂粒级团聚体的解吸率最低,但砂粒级团聚体颗粒对解吸总量的贡献最大。3种金属中,Cu的解吸率（〉15%）和解吸速率最大,原土及不同粒径颗粒团聚体组分的Cu、Pb和Zn的EDTA解吸过程均出现快速增长再趋于平缓的两个阶段,动力学模拟以Elovich方程描述最优。
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| 关 键 词： | 重金属 水稳团聚体 淋洗 |
Desorption of Cu, Zn and Pb from Water Stable Soil Aggregates Separated from Heavy Metal Contaminated Soil Using EDTA |
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| WANG Qu-yi,DING Zhu-hong,HU Xin,ZHANG Yu-feng,YIN Da-qiang.Desorption of Cu, Zn and Pb from Water Stable Soil Aggregates Separated from Heavy Metal Contaminated Soil Using EDTA[J].Agro-Environmental Protection,2012(7):1324-1329. |
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| Authors: | WANG Qu-yi DING Zhu-hong HU Xin ZHANG Yu-feng YIN Da-qiang |
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| Institution: | 1.School of Environment, Nanjing University of Technology, Nanjing 211816, China; 2.Center of Modem Analysis, Nanjing University, Nanjing 210093, China; 3.Key Laboratory of Yangtze River Water Environment, School of Environment, Tongji University, Shanghai 200092, China ) |
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| Abstract: | Water stable aggregates were separated from the heavy metal contaminated soil from Guli copper mine area. Characteristics of the soil and soil aggregates were investigated. And then the contaminated soil and soil aggregates were washed with EDTA to remove the heavy metals. Results showed that aggregates of size 〈0.002 mm had the highest cation exchange capacity（CEC） and content of organic matter （ OM ）, free aluminum oxide （Aid） and free iron oxide （Fen）. Cu and Zn contents in aggregates of size 〈0.002 mm were much greater than in aggregates of other sizes, while Pb content in aggregates of size 〉0.2 mm was the highest. Percentage of the heavy metals（ Cu, Pb and Zn ） des- orbed from aggregates of size 〈0.002 mm and 0.02-0.002 mm was the highest among all sizes of the aggregates. Though the lowest desorption efficiency of the heavy metals were observed in the case of aggregates of size〉0.2 mm, the desorption of heavy metals from aggregates of size 〉 0.2 mm contributed the greatest to the total desorption amount of the heavy metals, due to the greatest mass ratio of this size of aggregates in the bulk soil. Cu had the highest desorption efficiency（〉15%） and rate among the three metals. The desorption processes of the tested metals could be well described by the Elovich equation. |
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| Keywords: | heavy metal aggregates desorption kinetics |
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