Formation of iodo-trihalomethanes during disinfection and oxidation of iodide containing waters
Formation of iodo-trihalomethanes during disinfection and oxidation of iodide containing waters
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DOI：
10.1021/es9914590
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发表时间：
2000-07-01
影响因子：
11.4
通讯作者：
von Gunten, U
中科院分区：
文献类型：
--
作者：
Bichsel, Y;von Gunten, U
在含碘饮用沃茨的氧化处理过程中，碘-三卤甲烷（I-THMs）如碘仿（CHI 3）的形成可能是造成味道和气味问题的原因。I-THMs是由次碘酸（HOI）与天然有机物反应形成的。HOI是由天然存在的碘化物（I-）通过臭氧、氯或氯胺氧化而迅速形成的。HOI与有机模型化合物的反应动力学以及由此产生的CHI 3的形成进行了测量。取代的苯酚，苯酚，并在较小程度上，α-甲基羰基化合物被发现是反应对HOI，也产生CHI 3。间苯二酚（间羟基苯酚）具有最高的CHI 3产率。I-THM形成的动力学也在天然沃茨中进行了测量，所述天然水体用臭氧、氯或氯胺进行氧化处理。当使用臭氧时，没有检测到I-THMs，并且大于或等于90%的I-转化为IO 3-。氯导致IO 3-和I-THMs的形成。随着氯剂量的增加，CHI 3的形成减少，而IO 3-的形成，以及经典的三卤甲烷，如氯仿的形成，增加。在氯胺化过程中，I-THMs（尤其是CHI 3）是主要产物。在天然沃茨氧化过程中，CHI 3的生成量按O-3 < Cl-2 <NH 2Cl的顺序增加。
The formation of iodo-trihalomethanes (I-THMs) such as iodoform (CHI3) during oxidative treatment of iodide-containing drinking waters can be responsible for taste and odor problems. I-THMs are formed by reactions of hypoiodous acid (HOI) with natural organic matter. HOI is quickly formed from naturally occurring iodide (I-) by oxidation with ozone, chlorine, or chloramine. The kinetics of reactions of HOI with organic model compounds as well as the resulting CHI3 formation were measured. Substituted phenols, phenol, and, to a smaller extent, alpha-methyl carbonyl compounds were found to be reactive toward HOI and also to yield CHI3. Resorcinol (m-hydroxyphenol) had the highest yield of CHI3. The kinetics of I-THM formation were also measured in natural waters which were oxidatively treated with ozone, chlorine, or chloramine. When ozone was used, no I-THMs were detected and greater than or equal to 90% of I- was transformed to IO3-. Chlorine led to the formation of both IO3- and I-THMs. With increasing chlorine doses, the CHI3 formation decreased, whereas IO3- formation, as well as the formation of classical THMs such as chloroform, increased. In chloramination processes, I-THMs (especially CHI3) were the main products. The CHI3 formation in the oxidation of natural waters increased in the order O-3 < Cl-2 < NH2Cl.