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首页> 外文期刊>Environmental Science & Technology >Chemical Alterations of Dissolved Organic Matter by Permanganate Oxidation
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Chemical Alterations of Dissolved Organic Matter by Permanganate Oxidation

机译：高锰酸盐氧化可溶解有机物的化学变化

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摘要

Dissolved organic matter (DOM) is ubiquitous in raw drinking water and can efficiently scavenge oxidants, such as permanganate. Here, changes to DOM induced by permanganate oxidation under typical drinking water treatment conditions (6 μM, 1 h) to bulk DOM properties, DOM functional groups, and DOM chemical formulae were examined for two DOM isolate types (terrestrial and microbial). Permanganate oxidation did not mineralize DOM, rather changes were compositional in nature. Optical properties suggest that permanganate oxidation decreased DOM aromaticity (decreased SUVA-254), decreased DOM electron-donating capacity, and decreased DOM average molecular weight (increased E2/E3 ratios). Fourier-transform-infrared spectroscopy second derivative analyses revealed that permanganate does not oxidize DOM alkene groups, suggesting permanganate access to functional groups may be important. Four ionization techniques were used with ultrahigh-resolution mass spectrometry: negative and positive ion mode electrospray ionization and negative and positive ion mode laser/ desorption ionization. The results from all four techniques were combined to understand changes in DOM chemical formulae. It was concluded that nitrogen-containing aromatic compounds and alkylbenzenes were oxidized by permanganate to form nitrogen-containing aliphatic compounds and benzoic acid-containing compounds. This work highlights how multiple ionization techniques coupled with UHR-MS can enable a more detailed characterization of DOM.
机译：饮用水中普遍存在溶解性有机物（DOM），可以有效清除高锰酸盐等氧化剂。在这里，针对两种DOM分离物类型（陆地和微生物），研究了在典型的饮用水处理条件（6μM，1小时）下高锰酸盐氧化引起​​的DOM的变化，以改变其总体DOM性质，DOM官能团和DOM化学分子式。高锰酸盐的氧化不会使DOM矿化，而是本质上是组成变化。光学性质表明，高锰酸盐氧化可降低DOM芳香性（降低SUVA-254），降低DOM电子给体能力，以及降低DOM平均分子量（提高E2 / E3比）。傅里叶变换红外光谱的二阶导数分析表明，高锰酸盐不会氧化DOM烯烃基团，表明高锰酸盐接近官能团可能很重要。超高分辨率质谱仪使用了四种电离技术：负离子模式和正离子模式电喷雾电离以及负离子模式和正离子模式激光/解吸电离。将所有四种技术的结果结合起来，以了解DOM化学式的变化。结论是含氮芳族化合物和烷基苯被高锰酸盐氧化形成含氮脂族化合物和含苯甲酸化合物。这项工作强调了将多种电离技术与UHR-MS结合使用如何能够更详细地描述DOM。

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  • 来源
    《Environmental Science & Technology》 |2020年第6期|3256-3266|共11页
  • 作者

    Juliana R. Laszakovits; Arpad Somogyi; Allison A. MacKay;

  • 作者单位

    Department oj Civil Environmental and Geodetic Engineering The Ohio State University Columbus Ohio 43210 United States;

    Campus Chemical Instrument Center Mass Spectrometry and Proteomics The Ohio State University Columbus Ohio 43210 United States;

    Department of Civil Environmental and Geodetic Engineering The Ohio State University Columbus Ohio 43210 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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  • 正文语种 eng
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