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首页> 外文期刊>Environmental Science & Technology >The Influence of the Pre-Oxidation of Natural Organic Matter on the Formation of N-Nitrosodimethylamine (NDMA)
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The Influence of the Pre-Oxidation of Natural Organic Matter on the Formation of N-Nitrosodimethylamine (NDMA)

机译：天然有机物的预氧化对N-亚硝基二甲胺（NDMA）形成的影响

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摘要

NDMA is a recently recognized disinfection byproduct that can be formed by a reaction of monochloramine with natural organic matter (NOM). This study was undertaken to examine the influence of various preoxidation strategies (including prechlorination) on the subsequent formation of NDMA and to determine how this is correlated to the subsequent loss in specific UV absorbance (SUVA) that preoxidation causes. Batch experiments were conducted using surface-water-derived NOM exposed to various oxidants that included free chlorine, permanganate, hydrogen peroxide, and ozone. Photochemical oxidation was also studied by exposing the water to simulated sunlight. The amount of NDMA formed after monochloramine was added or formed in situ, in the case when free chlorine was the preoxidant, was significantly reduced by these treatments. The reduction was proportional to the reduction in SUVA that also occurred as a consequence of these treatments indicating that SUVA may be a good surrogate for NDMA precursor content. Furthermore, the change in NDMA formation per unit change in SUVA was a constant that did not depend on the nature of the oxidant.
机译：NDMA是最近公认的消毒副产物，可以通过一氯胺与天然有机物（NOM）反应形成。进行了这项研究，以检查各种预氧化策略（包括预氯化）对随后NDMA形成的影响，并确定这与后续预氧化引起的特定UV吸收率（SUVA）的损失如何相关。使用暴露于多种氧化剂（包括游离氯，高锰酸盐，过氧化氢和臭氧）的地表水衍生的NOM进行批量实验。通过将水暴露在模拟的阳光下，也研究了光化学氧化。通过这些处理，在游离氯为预氧化剂的情况下，一氯胺添加或原位形成后形成的NDMA量显着降低。减少与SUVA减少成正比，这也是这些处理的结果，表明SUVA可能是NDMA前体含量的良好替代物。此外，每单位SUVA变化中NDMA形成的变化是一个常数，该常数不取决于氧化剂的性质。

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  • 来源
    《Environmental Science & Technology》 |2008年第14期|5062-5067|共6页
  • 作者

    ZHUO CHEN; RICHARD L. VALENTINE;

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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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