摘要
以铜矿受污染土壤为对象,研究柠檬酸(CA)、草酸(OA)、乙二胺四乙酸(EDTA)、氨三乙酸(NTA)四种提取剂对铜和锌的浸提效果。分析六种土壤样品中酸溶态、还原态、氧化态、残渣态形式存在铜和锌的占比。研究结果表明:当提取剂的溶度小于0.02 mol/L时,相较于其他三种提取剂,EDTA对于铜的提取效果最好,在相同提取剂浓度下,EDTA比其他提取剂的提取效率至少高15%。当提取剂的溶度小于0.02 mol/L时,EDTA对锌的提取效果最好。分别测定四种提取剂提取前、后铜的化学赋存形态,发现以酸溶态和还原态形式存在的铜被大量提取,含量显著减少。评估环境风险发现,提取之后环境风险显著下降。
The leaching behaviour of Cu and Zn from contaminated soils at a copper mine was investigated using four extractants： citric acid （CA）, oxalic acid （OA）, ethylenediaminetetraacetic acid （EDTA） and nitrilotriacetic acid （NTA）. Six soil samples were characterized for the distribution of four chemical fractions of Cu or Zn （acid-soluble, reducible, oxidizable and residual）. For the extraction of Cu, EDTA is more effective than other extmctants when the concentration is less than 0.02 mol/L. The leaching efficiency for Cu was at least 15% higher for EDTA than for the other extractants at the same concentrations. Similar leaching behaviour was observed in the extraction of Zn. After extraction by CA, OA, EDTA or NTA, the acid-soluble fractions and the reducible fractions of Cu were the main fractions extracted. The potential environmental risks related to speciation were evaluated, and after extraction these risks were reduced.
作者
肖九花
周骏
王兆慧
李思悦
张伟超
方长玲
郭耀广
肖冬雪
娄晓神
柳建设
XIAO Jiu-hua;ZHOU Jun;WANG Zhao-hui;LI Si-yue;ZHANG Wei-chao;FANG Chang-ling;GUO Yao-guang;XIAO Dong-xue;LOU Xiao-yi IU Jian-she(College of Environmental Science and Engineering,Donghua University）,Shanghai 201620,China;International Center for Balanced Land Use（ICBLU）,The University of Newcastle,Callaghan,NSW 2308,Australia;Key Laboratory of Reservoir Aquatic Environment,Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China ~ Central South University Press and Springer-Verlag GmbH Germany,part of Springer Nature 2018)
基金
Project(2232013A3-08)supported by the Fundamental Research Funds for the Central Universities,China
Project supported by Shanghai Pujiang Program and DHU Distinguished Young Professor Program,China
