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首页> 外文期刊>Environmental Science & Technology >Assessing the Reactivity of Free Chlorine Constituents Cl_2, Cl_2O, and HOCl Toward Aromatic Ethers
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Assessing the Reactivity of Free Chlorine Constituents Cl_2, Cl_2O, and HOCl Toward Aromatic Ethers

机译：评估游离氯成分Cl_2，Cl_2O和HOCl对芳族醚的反应性

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摘要

Cl_2 and Cl_2O are highly reactive electro-philes capable of influencing rates of disinfection byproduct (DBP) precursor chlorination in solutions of free available chlorine (FAC). The current work examines how organic compound structure influences susceptibility toward chlorination by Cl_2 and Cl_2O relative to the more abundant (but less reactive) electrophile HOCl. Chlorination rates and products were determined for three aromatic ethers, whose reactivities with FAC increased in the order: 3-methylanisole <1,3-dimethoxybenzene <1,3,5-trimethoxybenzene. Varying solution conditions (pH, [FAC], [Cl~-]) permitted quantification of regiospecific second-order rate constants for formation of each product by Cl_2, Cl_2O, and HOCl. Our results indicate that as the reactivity of methoxybenzenes decreases, the importance of Cl_2 and Cl_2O (relative to HOCl) increases. Accordingly, Cl_2 and Cl_2O are likely to play important roles in generating DBPs that originate from natural organic matter (NOM) constituents of somewhat moderate reactivity. As [Cl_2] is proportional to [Cl~-] and [Cl_2O] is proportional to [HOCl]~2, ramifications for DBP control measures may differ significantly for these precursors compared to more reactive NOM moieties likely to react predominantly with HOCl. In particular, the role of chloride as a chlorination catalyst challenges its traditional classification as an "inert" electrolyte in water treatment processes.
机译：Cl_2和Cl_2O是高度反应性的亲电子试剂，能够影响游离氯（FAC）溶液中消毒副产物（DBP）前体氯化的速率。目前的工作是研究有机化合物的结构如何影响相对于较丰富（但反应性较低）的亲电子试剂HOCl的Cl_2和Cl_2O氯化反应的敏感性。确定了三种芳族醚的氯化速率和产物，它们与FAC的反应性依次提高：3-甲基苯甲醚<1,3-二甲氧基苯<1,3,5-三甲氧基苯。不同的溶液条件（pH，[FAC]，[Cl〜]）允许通过Cl_2，Cl_2O和HOCl定量形成每种产物的区域特异性二阶速率常数。我们的结果表明，随着甲氧基苯反应性的降低，Cl_2和Cl_2O（相对于HOCl）的重要性增加。因此，Cl_2和Cl_2O可能在产生DBP中起重要作用，所述DBP源自反应活性中等的天然有机物（NOM）成分。由于[Cl_2]与[Cl〜-]成正比，[Cl_2O]与[HOCl]〜2成正比，与这些反应性更强的NOM部分可能主要与HOCl反应相比，这些前体的DBP控制措施的分枝可能有显着差异。特别地，氯化物作为氯化催化剂的作用挑战了其在水处理过程中作为“惰性”电解质的传统分类。

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  • 来源
    《Environmental Science & Technology》 |2012年第4期|p.2141-2147|共7页
  • 作者

    John D. Sivey; A. Lynn Roberts;

  • 作者单位

    Department of Geography and Environmental Engineering, Johns Hopkins University, 313 Ames Hall, 34O0 North Charles Street,Baltimore, Maryland 21218, United States;

    Department of Geography and Environmental Engineering, Johns Hopkins University, 313 Ames Hall, 34O0 North Charles Street,Baltimore, Maryland 21218, 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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