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首页> 外文期刊>Environmental Science & Technology >Cadmium(ll) Speciation in Complex Aquatic Systems: A Study with Ferrihydrite, Bacteria, and an Organic Ligand
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Cadmium(ll) Speciation in Complex Aquatic Systems: A Study with Ferrihydrite, Bacteria, and an Organic Ligand

机译：复杂水生系统中的镉（II）形态：水铁矿，细菌和有机配体的研究

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摘要

Understanding the chemical interactions that occur in complex natural systems is fundamental to their management In this work, the distribution of cadmium in the presence of phthalic acid (H_2L_p), ferrihydrite, and bacteria cells [Comamonas spp., heat killed) was measured and modeled for systems with incrementally increasing complexity. In binary systems, cadmium adsorption onto bacteria or ferrihydrite was accurately predicted using the nonelectrostatic four site model (NFSM) and the diffuse layer model (DLM), respectively. Phthalic acid (0.6 mM) enhanced Cd~(2+) adsorption onto ferrihydrite (due to surface ternary complex formation) but inhibited Cd~(2+) adsorption onto bacteria to the same extent as predicted by Cd-phthalate solution complex formation constants, implying no significant surface ternary interaction occurred in this system. In Cd-ferrihydrite-bacteria systems, Cd~(2+) adsorption was up to 10% lower than that predicted by additive adsorption onto the pure phases which suggests that an interaction between ferrihydrite and the bacteria is occupying or masking adsorption sites. By adding a generic reaction to the model for the interaction between ferrihydrite and the bacteria, the adsorption of Cd~(2+) onto Comamonas spp.-ferrihydrite was accurately predicted and Cd~(2+) distribution and speciation in systems containing ferrihydrite, Comamonas spp., and H_2L_p could be predicted.
机译：了解在复杂的自然系统中发生的化学相互作用是其管理的基础。在这项工作中，对镉在邻苯二甲酸（H_2L_p），三水铁矿和细菌细胞（Comamonas spp。，被热杀死）的存在下的分布进行了测量和建模。适用于复杂性日益增加的系统。在二元系统中，分别使用非静​​电四位点模型（NFSM）和扩散层模型（DLM）准确预测了镉在细菌或水铁矿上的吸附。邻苯二甲酸（0.6 mM）增强了Cd〜（2+）在亚铁酸盐上的吸附（由于表面三元配合物的形成），但抑制了Cd〜（2+）在细菌上的吸附，其程度与邻苯二甲酸Cd-邻苯二甲酸酯溶液配合物形成常数所预测的程度相同，暗示在该系统中没有发生明显的表面三元相互作用。在Cd-水铁矿-细菌系统中，Cd〜（2+）的吸附量比通过添加剂吸附到纯相上所预测的要低10％，这表明水铁矿与细菌之间的相互作用正在占据或掩盖吸附位点。通过向模型中添加一个水铁矿与细菌相互作用的通用反应，可以准确地预测Cd〜（2+）在Comamonas spp.-水铁矿上的吸附，并且在含水铁矿的系统中Cd〜（2+）的分布和形态，可以预测到Comamonas spp。和H_2L_p。

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  • 来源
    《Environmental Science & Technology》 |2009年第19期|7430-7436|共7页
  • 作者

    YANTAO SONG; PETER J. SWEDLUND; NARESH SINGHAL; SIMON SWIFT;

  • 作者单位

    Departments of Civil and Environmental Engineering, University of Auckland, Private Bag 92019, Auckland, New Zealand;

    Departments of Civil and Environmental,Chemistry, University of Auckland, Private Bag 92019, Auckland, New Zealand;

    Departments of Civil and Environmental Engineering, University of Auckland, Private Bag 92019, Auckland, New Zealand;

    Molecular Medicine and Pathology, University of Auckland, Private Bag 92019, Auckland, New Zealand;

  • 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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