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A Binary Aqueous Component Model for the Sediment—Water Partitioning of Trace Metals in Natural Waters

机译：沉积物中二元水组分模型—天然水中痕量金属的水分配

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摘要

A model defining the overall sediment-water partitioning of a chemical, K_D, and the partitioning of its conservative components, (K_D)_i, is presented. With respect to many trace metals in natural waters it is proposed that, through strong and perhaps specific complexation, two independent aqueous components coexist and a binary form of the model is appropriate. For two components of a metal that exhibit unequal partitioning, an inverse relationship between K_D and particle concentration is predicted. Published experimental measurements of K_D for metals in river waters, derived under conditions which exclude variable concentrations of preexistent colloidal particles, displayed either an inverse dependence (Cu, Ni, and Pd) or little dependence (Cs) on particle concentration. Regarding the former, iterative fits with the binary model were better than empirical fits based on a third (colloidal) phase model, and suggested the presence of between about 10 and 75% of a particle-reactive component ((K_D)_1 ～ 5 x 10~4 to 10~(10) mL g~(-1)) and 25 and 90% of a less reactive (e.g., strongly complexed) component ((K_D)_2 ≤ 2.5 x 10~3 mL g~(-1)). Regarding Cs, data indicated the presence of a single component whose K_D was on the order of 10~3 mL g~(-1). These observations challenge the conventional means by which sediment-water partitioning is considered and modeled, and imply that a third phase is not always a prerequisite for the particle concentration effect frequently observed in laboratory and field studies.
机译：提出了一个模型，该模型定义了化学物质的总体沉积物-水分配K_D及其保守成分（K_D）_i的分配。对于天然水中的许多痕量金属，建议通过强力的（也许是特定的）络合，两个独立的水相成分共存，并且该模型的二元形式是合适的。对于表现出不均等分配的金属的两种成分，可以预测K_D与颗粒浓度之间的反比关系。在排除可变浓度的先前存在的胶体颗粒的条件下得出的河水中金属的K_D的公开实验测量值显示出与颗粒浓度成反比关系（Cu，Ni和Pd）或几乎没有依赖性（Cs）。关于前者，二元模型的迭代拟合优于基于第三相（胶体）模型的经验拟合，并建议存在约10％到75％的颗粒反应成分（（K_D）_1〜5 x 10〜4到10〜（10）mL g〜（-1））和25％和90％的反应性较低（例如强络合）的组分（（K_D）_2≤2.5 x 10〜3 mL g〜（-1） ））。关于Cs，数据表明存在单个成分，其K_D约为10〜3 mL g〜（-1）。这些观察结果对考虑和模拟沉积物-水分配的常规方法提出了挑战，并暗示第三相并非始终是实验室和现场研究中经常观察到的颗粒浓度效应的先决条件。

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  • 来源
    《Environmental Science & Technology》 |2007年第11期|p.3977-3983|共7页
  • 作者

    ANDREW TURNER;

  • 作者单位

    School of Earth, Ocean and Environmental Sciences, University of Plymouth, Plymouth PL4 8AA, U.K.;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
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