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首页> 外文期刊>Environmental Science & Technology >Influence of EDDS on Metal Speciation in Soil Extracts: Measurement and Mechanistic Multicomponent Modeling
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Influence of EDDS on Metal Speciation in Soil Extracts: Measurement and Mechanistic Multicomponent Modeling

机译：EDDS对土壤提取物中金属形态的影响：测量和机理多组分建模

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The use of the [S,S]-isomer of EDDS to enhance phytoextraction has been proposed for the remediation of heavy metal contaminated soils. Speciation of metals in soil solution in the presence of EDDS and dissolved organic matter (DOM) received, however, almost no attention, whereas metal speciation plays an important role in relation to uptake of metals by plants. We investigated the influence of EDDS on speciation of dissolved metals in batch extraction experiments using fourfield-contaminated soils with pH varying between 4.7 and 7.2. Free metal concentrations were determined with the Donnan membrane technique, and compared with results obtained with the chemical speciation program ECOSAT and the NICA-Donnan model using a multicomponent approach. Addition of EDDS increased total metal concentrations in our soil extracts by a factor between 1.1 and 32 (Al), 2.1-48 (Cu), 1.1-109 (Fe), 1.1-5.5 (Ni), and 1.3-17 (Zn). In general, Al, Cu, Fe, and Zn had the largest total concentrations in the EDDS-treated extracts, but the contribution of these metals to the sum of total metal concentrations varied significantly between our soils. Free metal concentrations varied between 7.0 and 8.9 (pCd~(2+)), 3.9-9.9 (pCu~(2+)), 6.3-10.2 (pNi~(2+)), and 5.2-7.0 (pZn~(2+)). Addition of EDDS decreased free metal concentrations by a factor between 1.4 and 1.9 (Cd), 3.4-216 (Cu), 1.3-186 (Ni), and 1.3-3.3 (Zn). Model predictions of free metal concentrations were very good, and predicted values were mostly within 1 order of magnitude difference from the measured concentrations. A multicomponent approach had to be used in our model calculations, because competition between Fe and other metals for binding with EDDS was important. This was done by including the solubility of metal oxides in our model calculations. Multicomponent models can be used in chelant-assisted phytoextraction experiments to predict the speciation of dissolved metals and to increase the understanding of metal uptake by plants.
机译：已经提出使用EDDS的[S，S]-异构体来增强植物提取作用，以修复重金属污染的土壤。然而，在EDDS和溶解有机物（DOM）存在下，土壤溶液中金属的形态几乎没有受到关注，而金属形态在植物吸收金属方面起着重要作用。在使用pH值介于4.7和7.2之间的四场污染土壤的分批提取实验中，我们研究了EDDS对溶解金属形态的影响。使用Donnan膜技术确定游离金属的浓度，并与使用多组分方法的化学物种形成程序ECOSAT和NICA-Donnan模型获得的结果进行比较。 EDDS的添加使我们土壤提取物中的总金属浓度增加了1.1至32（Al），2.1-48（Cu），1.1-109（Fe），1.1-5.5（Ni）和1.3-17（Zn）之间的倍数。通常，在经EDDS处理的提取物中，铝，铜，铁和锌的最大总浓度最高，但这些土壤对总金属浓度之和的贡献在我们的土壤之间差异很大。游离金属浓度在7.0至8.9（pCd〜（2 +）），3.9-9.9（pCu〜（2 +）），6.3-10.2（pNi〜（2+））和5.2-7.0（pZn〜（2）之间变化+））。 EDDS的添加将游离金属浓度降低了1.4到1.9（Cd），3.4-216（Cu），1.3-186（Ni）和1.3-3.3（Zn）之间。游离金属浓度的模型预测非常好，预测值与测量浓度的差异大多在1个数量级之内。在我们的模型计算中必须使用多组分方法，因为铁与其他金属之间与EDDS结合的竞争很重要。这是通过在模型计算中包括金属氧化物的溶解度来完成的。多组分模型可用于螯合剂辅助的植物提取实验中，以预测溶解金属的形态并增加对植物对金属吸收的了解。

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