A standardized method for assessment of oxidative transformations of brominated phenols in water
A standardized method for assessment of oxidative transformations of brominated phenols in water
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DOI：
10.1016/j.chemosphere.2007.08.019
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发表时间：
2008-01-01
期刊：
影响因子：
8.8
通讯作者：
Bergman, Ake
中科院分区：
文献类型：
--
作者：
Bastos, Patricia Moreira;Eriksson, Johan;Bergman, Ake
术语持久性一直被用来混淆，因为它被用作一个概念参数，没有一个统一的定义。因此，正在开展工作，通过研究环境中的主要降解途径：光解、水解-取代-消除(HSE)、氧化、还原和自由基反应，基于化合物的化学反应和化学物理性质，统一想法并描述持久性。目前的工作重点是开发一种方法来确定化学品的氧化降解率，从而测量其发生氧化反应的敏感性。基于高锰酸钾的方法适用于水溶性化合物，具有简便、可靠、廉价和重现性好的特点。在pH 7.6+/-0.2的条件下，通过改变分析物质，测定了溴代苯酚、两种氯代苯酚和高产化合物四溴双酚A(TBBPA)、四氯双酚A(TCBPA)和双酚A(BPA)的降解率。这两种卤代双酚A的反应速度特别快，半衰期只有几秒钟。其他测试化合物的反应速度较慢，但在所应用的反应条件下很容易测量。这些反应与温度有关。有证据表明，PK(A)和卤素的取代方式影响反应的速度。该方法具有较强的稳定性，适用于目前和未来可能的环境污染物的反应速率常数的测量。(C)2007爱思唯尔有限公司。保留所有权利。
The term persistence has been used to confusion since it is used as a conceptual parameter without a uniform definition. Work is therefore being done in order to unite ideas and describe persistence based on the chemical reactivity and chemico-physical properties of compounds via investigation of the main degradation pathways in the environment; photolysis, hydrolysis-substitution-elimination (hse), oxidation, reduction and radical reactions. The present work is focused on developing a method to determine oxidative degradation rates of chemicals and thereby measurement of their susceptibility to undergo oxidation reactions. The method based on potassium perman-ganate works well for water soluble compounds and is easy, robust, inexpensive and reproducible. By using the method and varying the analysed substances, the degradation rates for brominated phenols, two chlorinated phenols and high volume production compounds such as tetrabromobisphenol A (TBBPA), tetrachlorobisphenol A (TCBPA) and bisphenol A (BPA) have been determined at pH 7.6 +/- 0.2. The reaction rates of the two halogenated BPA's are particularly fast, giving half-lives in seconds. The other test compounds have slower reaction rates but easily measured under the reaction conditions applied. The reactions are temperature dependent. There is evidence that pK(a) and the substitution pattern of the halogens affects the rate of the reactions. The method is robust and applicable for reaction rate constant measurements of present and potential future environmental contaminants. (c) 2007 Elsevier Ltd. All rights reserved.