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Comparative Examination of Effects of Binding of Different Metals on Chromophores of Dissolved Organic Matter

机译：比较研究不同金属结合对溶解有机物发色团的影响

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摘要

This study quantified the binding of dissolved organic matter (DOM) from Suwarmee River with nine metals, Ca(Ⅱ), Mg(Ⅱ), Fe(Ⅲ), Al(Ⅲ), Cu(Ⅱ), Cd(Ⅱ), Cr(Ⅲ), Eu(Ⅲ), and Th(Ⅳ), using a differential absorbance approach. The differential spectra of DOM were closely fitted with six Gaussian bands that were present for all of the metals at varying pH values. Their maxima were located at ca. 200, 240, 276, 316, 385, and 547 nm (denoted as A0, A1, A2, A3, A4, and A5, respectively). The relative contributions and signs of the Gaussian bands were metal-specific and correlated to some degree with the covalent-bonding index of the ions and applicable complexation constants of the NICA-Donnan model. The intensity of band A4 was linearly proportional to the concentration of DOM-complexed metal, although these correlations formed two groups with different slopes, reflecting the nature of DOM-metal interactions. The results demonstrate that differential spectra yield results indicative of the nature and extent of metal and DOM interactions.
机译：本研究量化了苏瓦米河中的溶解性有机物（DOM）与Ca（Ⅱ），Mg（Ⅱ），Fe（Ⅲ），Al（Ⅲ），Cu（Ⅱ），Cd（Ⅱ），Cr等9种金属的结合（Ⅲ），Eu（Ⅲ）和Th（Ⅳ），采用差分吸收法。 DOM的微分光谱与六个高斯谱带紧密拟合，这些谱带对于所有金属在不同的pH值下均存在。它们的最大值位于约。 200、240、276、316、385和547 nm（分别表示为A0，A1，A2，A3，A4和A5）。高斯谱带的相对贡献和符号是金属特异性的，并且在一定程度上与离子的共价键指数和NICA-Donnan模型适用的络合常数相关。 A4的强度与DOM复合金属的浓度成线性比例，尽管这些相关关系形成了两个具有不同斜率的组，反映了DOM-金属相互作用的性质。结果表明，差分光谱产生的结果表明了金属和DOM相互作用的性质和程度。

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  • 来源
    《Environmental Science & Technology》 |2014年第6期|3177-3185|共9页
  • 作者

    Mingquan Yan; Gregory V. Korshin;

  • 作者单位

    The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Department of Environmental Engineering, Peking University, Beijing 100871, People's Republic of China;

    Department of Civil and Environmental Engineering, University of Washington, Box 352700, Seattle, Washington 98195-2700, United States;

  • 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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