农业环境科学学报2012，Vol.31Issue(7)：1324-1329,6.
EDTA对污染土壤水稳团聚体Cu Zn Pb的解吸作用
Desorption of Cu, Zn and Pb from Water Stable Soil Aggregates Separated from Heavy Metal Contaminated Soil Using EDTA
摘要
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 (Ald) and free iron oxide (Fed). 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.关键词
重金属/水稳团聚体/淋洗Key words
heavy metal/ aggregates/ desorption kinetics分类
资源环境引用本文复制引用
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].农业环境科学学报,2012,31(7):1324-1329,6.基金项目
国家自然科学基金青年基金(20107026) （20107026）
水体污染控制与治理重大科技专项(2008ZX07316-004) （2008ZX07316-004）
