Formation of iodinated trihalomethanes during UV/chloramination with iodate as the iodine source.
Formation of iodinated trihalomethanes during UV/chloramination with iodate as the iodine source.
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DOI：
10.1016/j.watres.2016.04.012
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发表时间：
2016-07
期刊：
影响因子：
12.8
通讯作者：
Tian-Yang Zhang;Yi-Li Lin;An-Qi Wang;Fu-xiang Tian;Bin Xu;Shengji Xia;N. Gao
中科院分区：
文献类型：
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作者：
Tian-Yang Zhang;Yi-Li Lin;An-Qi Wang;Fu-xiang Tian;Bin Xu;Shengji Xia;N. Gao
碘化三卤甲烷（I-THMs）是一组新出现的高毒性消毒副产物，碘化物（I-）以及碘化有机化合物有望成为其碘源。然而，在这项研究中，碘酸盐（IO 3 −）被证明是在UV/氯胺化过程中形成I-THM的新碘源。在含碘酸盐的沃茨中（没有任何其他碘源），I-THM的形成随着UV剂量、IO 3 −和NH 2Cl浓度的增加而增加。随着Br−/IO 3 −摩尔比的增加，I-THM的形成（特别是溴化物种）增加。此外，NOM物质可能会影响UV/氯胺化过程中IO 3-形成I-THM。富里酸能促进IO 3-向I-的光转化，而腐殖酸则抑制了I-的产生。在实际饮用水处理条件下（DOC = 5.0 mg-C/L，IO 3 −= 12.7 μg-I/L，UV剂量= 50 mJ/cm 2，NH 2Cl = 5 mg-Cl 2/L），采用固相微萃取法测得CHCl 2 I为0.17 μg/L，IO 3 −生成I-THMs的产率约为I−的7%。
Iodinated trihalomethanes (I-THMs) are a group of emerging disinfection by-products with high toxicity, and iodide (I−) as well as iodinated organic compounds are expected to be their iodine sources. Nevertheless, in this study, iodate (IO3−) was proven to be a new iodine source of I-THM formation during UV/chloramination. In the iodate-containing waters (without any other iodine sources), I-THM formation increased with the increase of UV dose, IO3−and NH2Cl concentrations. With the increase of Br−/IO3−molar ratio, I-THM formation (especially for the brominated species) increased. Besides, NOM species could affect I-THM formation from IO3−during UV/chloramination. Fulvic acid could promote IO3−phototransformation to I−but humic acid impeded the production of I−during UV irradiation. Under realistic drinking water treatment conditions (DOC = 5.0 mg-C/L, IO3−= 12.7 μg-I/L, UV dose = 50 mJ/cm2, NH2Cl = 5 mg-Cl2/L), CHCl2I was detected as 0.17 μg/L using solid-phase microextraction method, and the production rate of I-THMs from IO3−was about 7% of that from I−.