【摘要】 开展了UV降解碘海醇及后续氯化生成碘代三卤甲烷（I-THMs）特性的研究，考察了消毒副产物（DBPs）的分布情况及不同影响因素（紫外光强、p H、Br^-浓度）对碘海醇降解和I-THMs生成的影响，同时探究了其在实际水体中的变化规律。结果表明，UV降解碘海醇的降解速率与紫外光强呈正相关，与原水水质成分复杂程度呈负相关，受p H和Br^-浓度的影响不大。体系中生成的DBPs包括氯仿（CF）、水合氯醛（CH）、二氯乙腈（DCAN）、三氯硝基甲烷（TCNM）以及3种I-THMs（CHCl₂I、CHCl I₂、CHI₃）,CF浓度最高，其次是CHCl₂I。I-THMs的生成量随着UV辐照量及p H的升高均先升高后降低，分别在UV辐照量为2 670 m J/cm²和p H为7时达到最大值。随着Br^-浓度的增加，CHI₃浓度不断升高，3种含溴的I-THMs（CHBr I₂、CHBr₂I和CHCl Br I）组分所占比例也逐渐升高，但两种含氯的I-THMs（CHCl₂I和CHCl I₂）组分所占比例却逐渐下降。水质成分更复杂的原水2生成的总I-THMs浓度高于原水1。与纯水相比，两种原水都生成了3种含溴的I-THMs，但3种不含溴的I-THMs（CHCl₂I、CHCl I₂和CHI₃）在I-THMs总量中仍占主要部分，且比纯水背景下的生成浓度要高。水中的天然有机物（NOM）能够促进I-THMs的生成。更多还原

【Abstract】 This paper investigated the performance of ultraviolet （UV） for degradation of iohexol and the characteristics of iodinated trihalomethanes （I-THMs） formation,explored the distribution of disinfection by-products （DBPs） as well as the effects of UV intensity,p H and Br^-concentration on the degradation of iohexol and I-THMs formation,and revealed the changes of DBPs in actual water bodies.The degradation rate of iohexol was positively correlated with UV intensity and negatively correlated with the complexity of raw water composition,and was little affected by p H and Br^-concentration.The DBPs produced in the system included chloroform （CF）,chloral hydrate （CH）,dichloroacetonitrile （DCAN）,trichloronitromethane （TCNM） and three kinds of I-THMs （CHCl₂I、CHCl I₂、CHI₃） among which CF concentration was the highest,followed by CHCl₂I.The I-THMs production initially increased and then decreased with the increase of UV intensity and p H,and reached the maximum value when UV intensity was 2 670 m J/cm² and p H was 7.With the increase of Br^-concentration,the concentration of CHI₃increased continuously,and the proportion of three bromine-containing I-THMs （CHBr I₂,CHBr₂I and CHCl Br I） gradually increased,whereas the proportion of two chlorine-containing I-THMs （CHCl₂I and CHCl I₂） gradually decreased.The No.2 raw water sample with more complex water composition produced a higher concentration of I-THMs than the No.1 raw water sample.Compared with pure water,three bromine-containing I-THMs were generated in both raw water samples,but the three bromine-free I-THMs （CHCl₂I,CHCl I₂ and CHI₃） still accounted for the main part of the total I-THMs,and their concentrations were higher than that generated under the background of pure water.Natural organic matter （NOM） in water promoted the formation of I-THMs.更多还原