饮用水中消毒副产物二溴乙腈的形成机制  

Formation mechanism of the disinfection by-product dibromoacetonitrile in drinking water

作　　者：丁春生[1] 陈嘉都 李东兵[1] 霍建祺 

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310014

出　　处：《中国环境科学》2017年第11期4173-4178,共6页China Environmental Science

基　　金：浙江省自然科学基金资助项目(Y5110339);浙江省公益性技术应用研究计划项目(2012C23055)

摘　　要：以天冬氨酸为前体物,采用液液萃取-气相色谱(LLE-GC)的方法检测消毒副产物二溴乙腈(DBAN),研究了其形成的机制和影响因素.结果表明:在酸性较强时,DBAN的生成量很少,在酸性较弱时(pH=6~7),DBAN的生成量随pH值增大而迅速增多,而在碱性条件下,DBAN的生成量又会逐渐减小.在10~30℃条件下,温度对DBAN生成的影响并不大.溴离子浓度是形成DBAN的重要影响因素,DBAN的生成量随着溴离子浓度的增大而增多.天冬氨酸经取代、脱羧、氧化等8个步骤,最终形成DBAN.The detection method of the disinfection by-product dibromoacetonitrile(DBAN) was established by mean of liquid-liquid extraction and gas chromatograph(LLE-GC) method using aspartic acid as the precursor, and the DBAN formation mechanism and its influencing factors were also discussed. The results showed that the production of DBAN was little when the acidity was strong and the production of DBAN rapidly increased with the increase of pH when the pH value was in the range from 6 to 7, while the production of DBAN gradually decreased at the alkaline conditions. The impact of temperature on the formation was minor at 10~30 degrees conditions. Bromide ion concentration was found an important influencing factor, the production of DBAN increased with the bromide ion concentration increasing. After the total 8 steps of the process, such as substitution, decarboxylation and oxidation, the aspartic acid was finally formed into DBAN.

关 键 词：消毒副产物 二溴乙腈 前体物 形成机制 影响因素 

分 类 号：X703.5[环境科学与工程—环境工程]