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首页> 外文期刊>Environmental Science & Technology: ES&T >Assessing the Reactivity of Free Chlorine Constituents Cl2, Cl2O, and HOCI Toward Aromatic Ethers
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Assessing the Reactivity of Free Chlorine Constituents Cl2, Cl2O, and HOCI Toward Aromatic Ethers

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摘要

Cl2 and Cl2O 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 Cl2 and C12O relative to the more abundant (but less reactive) electrophile HOCI. Chlori- nation rates and products were determined for three aromatic ethers, whose reactivities with FAC increased in the order: 3-methylanisole <1,3-dirnethoxybenzene <1,3,5-trimethoxybenzene. Varying solution conditions (pH, FAC, C1~) permitted quantification of regiospecific second-order rate constants for formation of each product by Cl2, Cl2O, and HOCI. Our results indicate that as the reactivity of methoxybenzenes decreases, the importance of Cl2 and Cl2O (relative to HOCl) increases. Accordingly, Cl2 and Cl2O are likely to play important roles in generating DBPs that originate from natural organic matter (NOM) constituents of somewhat moderate reactivity. As Cl2 is proportional to Cl~- andCl2O 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.

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  • 来源
    《Environmental Science & Technology: ES&T》 |2012年第4期|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, 3400 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);
  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类 环境科学、安全科学;
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