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Dissolved Organic Matter Conformation and Its Interaction with Pyrene As Affected by Water Chemistry and Concentration

机译：受水化学和浓度影响的溶解有机物构象及其与P的相互作用

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Water chemistry and concentration of dissolved organic matter (DOM) have been reported to affect DOM conformation and binding properties with hydrophobic organic contaminants (HOCs). However, relationship between DOM conformation and its binding properties remains unclear. We designed a multibag equilibration system (MBES) to investigate the variation of carbon-normalized sorption coefficients (K_(DOC)) of pyrene at different DOM concentrations based on an identical free solute concentration at different pHs and in the presence of Al ions. In addition, we studied the conformation of DOM under different conditions via atomic force microscopy (AFM) imaging, dynamic light scattering, and zeta potential measurements. Zeta potential measurements indicated that intra- and intermolecular interaction was facilitated at low pH or with the presence of Al ions, and a more organized molecular aggregate (such as a micelle-like structure) could form, thus, enhancing K_(DOC). As DOM concentration increased, DOM molecular aggregation was promoted in a way reducing K_(DOC). This research is a first attempt to correlate DOM conformation with /(doc-Aggregation of DOM molecules resulting from increased zeta potential (less negative) generally led to an increased /(doc-Further study in this area will provide valuable information on HOC-DOM interactions, thus, leading to more accurate predictions of K_(DOC).
机译：据报道，水的化学性质和溶解有机物的浓度会影响DOM的构象和与疏水性有机污染物（HOC）的结合性能。但是，DOM构象及其绑定属性之间的关系仍然不清楚。我们设计了一个多袋平衡系统（MBES），以研究在不同DOM下基于相同的自由溶质浓度和Al离子存在的情况下，不同DOM浓度下pyr的碳标准化吸附系数（K_（DOC））的变化。此外，我们通过原子力显微镜（AFM）成像，动态光散射和Zeta电位测量研究了在不同条件下DOM的构象。 Zeta电位测量结果表明，在低pH值或存在Al离子的情况下，分子内和分子间的相互作用得到促进，并且可以形成更有序的分子聚集体（如胶束状结构），从而增强K_（DOC）。随着DOM浓度的增加，DOM分子聚集以降低K_（DOC）的方式促进。这项研究是将DOM构象与/（doc-zeta电位增加（负值较少）引起的DOM分子聚集）相关的首次尝试，通常会导致/（doc-doc进一步的研究将在此领域提供有价值的信息相互作用，从而导致对K_（DOC）的更准确的预测。

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  • 来源
    《Environmental Science & Technology》 |2008年第5期|1594-1599|共页
  • 作者

    BO PAN; SAIKAT GHOSH; BAOSHAN XING;

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  • 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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