| 天冬氨酸在氯化过程中生成消毒副产物二氯乙腈的研究 |
| 摘要点击 1537 全文点击 830 投稿时间：2015-09-30 修订日期：2015-12-15 |
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| 中文关键词 饮用水 二氯乙腈 天冬氨酸 形成机制 影响因素 |
| 英文关键词 drinking water dichloroacetonitrile(DCAN) aspartic acid formation mechanism influencing factors |
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| 中文摘要 |
| 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pH值的增大而增大,在碱性条件下,DCAN的生成量随着pH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. |
| 英文摘要 |
| In this study, a method was developed for the determination of dichloroacetonitrile(DCAN) in drinking water by liquid-liquid micro-extraction and gas chromatography/mass spectrometry (LLE-GC/MS), which used 1,2-dibromopropane as the internal standard and methyl tertiary butyl ether (MTBE) as the extractant for high accuracy. The aspartic acid was used as the precursor of the DCAN formation during chlorination and the influencing factors were evaluated. The formation mechanism of DCAN was also discussed. The results showed that the DCAN amount increased with the increase of pH value under the neutral and acidic conditions, however, the amount of DCAN decreased with the increase of pH value under the alkali condition. And the final amount of DCAN under the alkali condition was much less than that under the neutral and acidic conditions. It was also found that the DCAN amount increased with the increase of chlorine addition, while the temperature in the range of 10-30℃ had little influence on the DCAN formation. The formation process of the DCAN from aspartic acid by chlorination included seven steps, such as substitution, decarboxylation, oxidation, etc and ultimately formed DCAN. |
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