Soil microbial activities and heavy metal mobility in long-term contaminated soils after addition of EDTA and EDDS
Soil microbial activities and heavy metal mobility in long-term contaminated soils after addition of EDTA and EDDS
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DOI：
10.1016/j.ecoleng.2010.08.004
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发表时间：
2011-07-01
影响因子：
3.8
通讯作者：
Muehlbachova, G.
中科院分区：
文献类型：
--
作者：
Muehlbachova, G.
通过40 d的培养试验，研究了添加EDTA（乙二胺四乙酸）和EDDS（[S，S]-乙二胺二琥珀酸）对长期污染的耕地和草地土壤微生物活性和重金属有效性的影响。在实验中使用的土壤与铅冶炼厂附近的重金属类似的污染。土壤微生物碳（C-mic）在耕地土壤（CM 1）添加EDTA后显着降低：在草地土壤（CM 2）中观察到较小的影响。添加EDDS导致孵育前10天内C-mic下降。在实验的后期阶段，C-MIC增加，甚至超过了对照土壤中发现的量。土壤中加入螯合剂后，呼吸活性和代谢产物（qCO（2））增加。EDTA处理的土壤呼吸活性和qCO（2）值均高于对照。用NH 4 NO3溶液萃取易获得的重金属组分。容易动员的重金属组分的镉，铅，锌，和（部分）铜增加在第一个3-10天的孵育在EDTA的存在下。EDDS的加入特别增加了有效Cu的浓度。EDTA和EDDS处理土壤中硝酸铵可提取态重金属含量与土壤呼吸活性和qCO（2）均呈显著正相关。这表明，增强的金属流动性严重影响了实验土壤中的微生物过程。此外，在添加EDTA的CM 1土壤中，NH 4 NO3可提取态Cd、Cu与微生物生物量之间存在一定的相关性。(C)2010 Elsevier B. V.保留所有权利。
A 40-day incubation experiment was carried out in order to evaluate the microbial activities and heavy metal availability in long-term contaminated arable and grassland soils after addition of EDTA (ethylenediaminetetraacetic acid) or EDDS ([S,S]-ethylenediaminedisuccinic acid). Soils with similar contamination of heavy metal from the vicinity of a lead smelter were used in the experiment. The soil microbial carbon (C-mic) decreased significantly after addition of EDTA in the arable soil (CM 1): lesser effects were observed in the grassland soil (CM2). Addition of EDDS caused a decrease of C-mic during the first 10 days of incubation. In the later phases of the experiment, C-mic increased, and even exceeded the amounts found in the control soils. Respiratory activities and metabolic quotients (qCO(2)) increased after the addition of the chelating agents into the soils. Higher respiratory activities and qCO(2) were observed in the EDTA-treated soils. The readily available heavy metal fractions were extracted with NH4NO3 solution. Readily mobilizable heavy metal fractions of Cd, Pb, Zn, and (in part) Cu increased during the first 3-10 days of incubation in the presence of EDTA. The addition of EDDS particularly increased concentrations of available Cu. Significant correlations between NH4NO3-extractable metals, soil respiratory activities, and qCO(2) were found in both soil treatments with EDTA and EDDS. This indicates that enhanced metal mobility seriously affects the microbial processes in experimental soils. In addition, the relationships between NH4NO3-extractable Cd, Cu, and the microbial biomass were found in the CM1 soil amended with EDTA. (C) 2010 Elsevier B.V. All rights reserved.