Active oxygen species generated during chlorination and ozonation
Active oxygen species generated during chlorination and ozonation
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DOI：
10.2166/wst.1994.0451
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发表时间：
1994-11
影响因子：
2.7
通讯作者：
H. Utsumi;Masafumi Hakoda;S. Shimbara;H. Nagaoka;Youn-Son Chung;A. Hamada
中科院分区：
文献类型：
--
作者：
H. Utsumi;Masafumi Hakoda;S. Shimbara;H. Nagaoka;Youn-Son Chung;A. Hamada
在水处理中，紫外线照射、臭氧氧化和氯化被认为会产生各种活性氧物质，这些物质似乎会参与与腐殖酸、污染物和细菌的反应。然而，由于方法的不足，在这些过程中很难确定活性氧的实际种类和数量。为了确定可能参与水处理过程的活性氧物质的种类和数量，采用了自旋捕获电子自旋共振（ESR）技术来测量氯化和臭氧氧化过程中产生的不稳定自由基。作为自旋捕获试剂，将5,5 - 二甲基 - 1 - 吡咯啉 - N - 氧化物（DMPO）溶解在磷酸盐缓冲水中，然后对该溶液进行氯化或臭氧氧化处理。处理后立即在室温下测量ESR光谱。从两种处理中都观察到了由DMPO - OH产生的典型ESR光谱，这表明在氯化和臭氧氧化过程中产生了羟基自由基。除了DMPO - OH，还观察到了几个不同的信号，并且它们的出现取决于氯或臭氧的浓度。
In water treatment, ultraviolet irradiation, ozonation, and chlorination are believed to produce various active oxygen species, which seem to participate in reactions with fumic acid, pollutants and bacteria. It was, however, very difficult to determine the actual kinds and amount of active oxygen during the processes because of deficiencies of method. In order to determine the kinds and amounts of active oxygen species which may participate in water treatment process, the spin-trapping ESR (electron spin resonance) technique was applied to measuring unstable free radicals generated during chlorination and ozonation. As spin-trapping reagent, DMPO (5,5-dimethyl-1-pyrroline-N-oxide) was dissolved in phosphate-buffered water, and the solution was treated by either chlorination or ozonation. Immediately after the treatment, ESR spectrum was measured at room temperature. Typical ESR spectra due to DMPO-OH were observed from both treatments, indicating the generation of hydroxy radical in chlorination and ozonation. In addition to DMPO-OH, several different signals were observed and their appearance depended on the chlorine or ozone concentration.