土壤淋洗后土壤溶液中残留的SS-乙二胺二琥珀酸（EDDS）的生物降解与形态分析
Biodegradation and speciation of residual SS-ethylenediaminedisuccinic acid (EDDS) in soil solution left after soil washing.
作者信息
Tandy Susan, Ammann Adrian, Schulin Rainer, Nowack Bernd
机构信息
Institute of Terrestrial Ecology, Swiss Federal Institute of Technology (ETH), Universitätstrasse 16, CH-8092 Zürich, Switzerland.
出版信息
Environ Pollut. 2006 Jul;142(2):191-9. doi: 10.1016/j.envpol.2005.10.013. Epub 2005 Dec 9.
This paper aims to investigate the degradation and speciation of EDDS-complexes (SS-ethylenediaminedisuccinic acid) in soil following soil washing. The changes in soil solution metal and EDDS concentrations were investigated for three polluted soils. EDDS was degraded after a lag phase of 7-11 days with a half-life of 4.18-5.60 days. No influence of EDDS-speciation on the reaction was observed. The decrease in EDDS resulted in a corresponding decrease in solubilized metals. Changes in EDDS speciation can be related to (1) initial composition of the soil, (2) temporarily anoxic conditions in the soil slurry after soil washing, (3) exchange of EDDS complexes with Cu even in soils without elevated Cu and (4) formation of NiEDDS. Dissolved organic matter is important for metal speciation at low EDDS concentrations. Our results show that even in polluted soils EDDS is degraded from a level of several hundred micromoles to below 1 microM within 50 days.
本文旨在研究土壤淋洗后土壤中乙二胺二琥珀酸（EDDS）络合物的降解和形态变化。对三种污染土壤的土壤溶液中金属和EDDS浓度的变化进行了研究。EDDS在7 - 11天的滞后期后开始降解，半衰期为4.18 - 5.60天。未观察到EDDS形态对反应有影响。EDDS的减少导致溶解态金属相应减少。EDDS形态的变化可能与以下因素有关：（1）土壤的初始组成；（2）土壤淋洗后土壤浆液中的暂时缺氧条件；（3）即使在铜含量未升高的土壤中，EDDS络合物与铜的交换；（4）镍乙二胺二琥珀酸的形成。在低EDDS浓度下，溶解有机物对金属形态很重要。我们的结果表明，即使在污染土壤中，EDDS在50天内也能从几百微摩尔的水平降解至低于1微摩尔。
Zotero 插件