文献类型：期刊文献

英文题名：Degradation kinetics of organic chloramines and formation of disinfection by-products during chlorination of creatinine

作者：Zhang, Tianyang[1,2];Xu, Bin[2,3];Wang, Anqi[2];Cui, Changzheng[1,3]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Minist Educ,Key Lab Yangtze Water Environm, Shanghai 200092, Peoples R China;[3]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2018

卷号：195

起止页码：673

外文期刊名：CHEMOSPHERE

收录：;EI(收录号：20175204587587);WOS:【SCI-EXPANDED(收录号:WOS:000424172400070)】；

基金：This study was supported in part by the Natural Science Foundation of China (No. 51478323 and 51778444), National Major Science and Technology Project of China (No. 2017ZX07207004) and Shanghai Tongji Gao Tingyao Environmental Science & Technology Development Foundation.

语种：英文

外文关键词：Organic chloramines; Creatinine; Chlorocreatinine; Chlorination; Disinfection by-products (DBPs)

摘要：Organic chloramines can interfere with the measurement of effective combined chlorine in chlorinated water and are potential intermediate products of highly toxic disinfection by-products (DBPs). In order to know more about the degradation and transformation of organic chloramines, a typical organic chloramine precursor creatinine was selected for investigation and a corresponding individual organic chloramine chlorocreatinine was prepared in this study. The preparation condition of chlorocreatinine by chlorination was established as chlorine/creatinine = 1 M/M, reaction time = 2 h and pH = 7.0. Then the degradation kinetics of chlorocreatinine during further chlorination was studied, and a second-order rate constant of 1.16 (+/- 0.14) M-1 s(-1) was obtained at pH 7.0. Solution pH significantly influenced the degradation rate, and the elementary rate constants of chlorocreatinine with HOCI+H+, HOCI, OCl- and chlorocreatinine(-) with OCl- were calculated as 2.43 (+/- 1.55) x 10(4) M-2 (+/- 0.09) M-1 s(-1), 2.86 (0.30) M-1 s(-1) and 3.09 (+/- 0.24) M-1 s(-1), respectively. Besides, it was found that chlorocreatinine could be further converted into several C-DBPs (chloroform and trichloroacetone) and N-DBPs (dichloroacetonitrile (DCAN) and trichloronitromethane (TCNM)) during chlorination. The total yield of DBPs increased obviously with increasing pH, especially for TCNM. In addition, the presence of humic acid in creatinine solution could increase the formation of DCAN obviously during chlorination. Based on the UPLC-Q-TOF-MS analysis, the conversion pathways of chlorocreatinine were proposed. Several kinds of intermediate products were also identified as organic chloramines and some of them could even exist stably during the further chlorination. (C) 2017 Elsevier Ltd. All rights reserved.