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首页> 外文期刊>Environmental Science & Technology >Multi-surface Modeling To Predict Free Zinc Ion Concentrations in Low-Zinc Soils
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Multi-surface Modeling To Predict Free Zinc Ion Concentrations in Low-Zinc Soils

机译：预测低锌土壤中游离锌离子浓度的多表面建模

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摘要

Multi-surface models are widely used to assess the potential ecotoxico-logical risk in metal-contaminated soils. Their accuracy in predicting metal speciation in soils with low metal levels was not yet tested. Now highly sensitive analytical techniques are available to experimentally validate such models at low concentration levels. The objective of this study was to test the accuracy of a multi-surface model to predict the Zn2* concentration and to improve our understanding of Zn bioavailability in low-Zn soils. High-Zn soils were included as controls. Model parameters were determined independently on the basis of earlier peer-reviewed publications. Model output was validated against free Zn~(2+) concentrations determined with the soil column Donnan membrane technique in a range of soils varying in potentially available Zn, organic matter, day silicate, and iron (hydr)oxide contents and pH. Deviations between predicted Zn~(2+) concentrations and experimentally determined values over the whole Zn concentration range were less or equal to the experimental standard error, except for one low-Zn soiL The Zn~(2+) concentration was mainly controlled by adsorption, where organic matter was predicted to be the dominant soil sorbent The predicted Zn~(2+) concentration depends more sensitively upon changes of the reactive Zn pool (application of 0.6, 1.2, 2.4, and 3.6 mg of Zn kg~(-1) of soil) and organic matter content (±0.2 and 0.496) than pH changes (±0.5 and 1 pH unit).
机译：多表面模型被广泛用于评估金属污染土壤中的潜在生态毒理学风险。尚未测试它们在预测低金属含量土壤中金属形态方面的准确性。现在，高灵敏度的分析技术可用于以低浓度水平通过实验验证此类模型。这项研究的目的是检验多表面模型的准确性，以预测Zn2 *的浓度并增进我们对低锌土壤中锌生物利用度的理解。高锌土壤作为对照。模型参数是根据早期同行评审的出版物独立确定的。使用土壤柱Donnan膜技术测定的土壤中可用的Zn，有机物，日硅酸盐和氧化铁（氢氧化物）的含量和pH值变化，针对模型中的游离Zn〜（2+）浓度对模型输出进行了验证。在整个Zn浓度范围内，预测的Zn〜（2+）浓度与实验确定的值之间的偏差小于或等于实验标准误差，但一种低锌溶液除外Zn〜（2+）浓度主要由吸附控制，其中有机物被认为是主要的土壤吸附剂。预测的Zn〜（2+）浓度更敏感地取决于反应性锌池的变化（施用0.6、1.2、2.4和3.6 mg Zn kg〜（-1） ）和有机质含量（±0.2和0.496）比pH的变化（±0.5和1 pH单位）。

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  • 来源
    《Environmental Science & Technology》 |2014年第10期|5700-5708|共9页
  • 作者

    Andreas Duffher; Liping Weng; Ellis Hoffland; Sjoerd E. A. T. M. van der Zee;

  • 作者单位

    Department of Soil Quality Wageningen University, 6708 PB Wageningen, Netherlands;

    Department of Soil Quality Wageningen University, 6708 PB Wageningen, Netherlands;

    Department of Soil Quality Wageningen University, 6708 PB Wageningen, Netherlands;

    Soil Physics and Land Management Group,Wageningen University, 6708 PB Wageningen, Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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