天冬氨酸在氯化过程中生成消毒副产物二氯乙腈的研究
发布时间：2018-08-01 16:52
【摘要】：选择甲基叔丁基醚为萃取剂,1,2-二溴丙烷为内标物,采用气相色谱/质谱法,建立了含氮消毒副产物二氯乙腈(DCAN)的测定方法.以天冬氨酸为前体物,研究饮用水氯化消毒过程中二氯乙腈的形成过程及影响因素,并探讨了二氯乙腈的生成机制.结果表明,在酸性及中性条件下,DCAN的生成量随着p H值的增大而增大,在碱性条件下,DCAN的生成量随着p H值的增大而减小,并且碱性条件下DCAN的生成量明显比中性和酸性条件下低.投氯量增加,DCAN的生成量也随之不断提高.在10~30℃范围内,温度对形成DCAN的影响不大.天冬氨酸氯化形成DCAN的过程包括7个步骤,经过一系列包括取代、脱羧、氧化等反应后,最终形成DCAN.
[Abstract]:A method for the determination of nitrogen-containing disinfection by-product dichloroacetonitrile (DCAN) was developed by gas chromatography / mass spectrometry with methyl tert Ding Ji ether as extractant and dibromopropane as internal standard. The formation process and influencing factors of dichloroacetonitrile during chlorination and disinfection of drinking water were studied with aspartic acid as precursor, and the formation mechanism of dichloroacetonitrile was discussed. The results show that the production of Dcan increases with the increase of pH value under acidic and neutral conditions, and decreases with the increase of pH value in alkaline condition. Moreover, the amount of DCAN under alkaline condition is lower than that under neutral and acidic conditions. The amount of chlorine added increases the production of Dcan. In the range of 1030 鈩，
本文编号：2158220
[Abstract]:A method for the determination of nitrogen-containing disinfection by-product dichloroacetonitrile (DCAN) was developed by gas chromatography / mass spectrometry with methyl tert Ding Ji ether as extractant and dibromopropane as internal standard. The formation process and influencing factors of dichloroacetonitrile during chlorination and disinfection of drinking water were studied with aspartic acid as precursor, and the formation mechanism of dichloroacetonitrile was discussed. The results show that the production of Dcan increases with the increase of pH value under acidic and neutral conditions, and decreases with the increase of pH value in alkaline condition. Moreover, the amount of DCAN under alkaline condition is lower than that under neutral and acidic conditions. The amount of chlorine added increases the production of Dcan. In the range of 1030 鈩，
本文编号：2158220
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