| 饮用水中消毒副产物1,1-二氯丙酮的形成机制 |
| 摘要点击 2606 全文点击 1056 投稿时间：2014-11-13 修订日期：2014-11-30 |
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| 中文关键词 消毒副产物 1,1-二氯丙酮 前体物 形成机制 影响因素 |
| 英文关键词 disinfection byproduct 1,1-dichloroacetone (DCAce) precursor formation mechanism influencing factor |
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| 中文摘要 |
| 采用气相色谱/质谱法,以甲基叔丁基醚为萃取剂,1,2-二溴丙烷为内标物,建立了消毒副产物1,1-二氯丙酮(DCAce)的测定方法. 以L-亮氨酸为前体物,考察了DCAce的形成过程和影响因素. 结果表明, 当氯胺投加量在5~30mg ·L-1范围内,DCAce的生成量随着氯胺投加量的增加而增加; DCAce的生成量随着pH的增大而逐渐减小,在酸性条件下DCAce的生成量比中性和碱性条件下高; 在15~35℃ 范围内,温度对DCAce生成量的影响较明显,生成量随着温度的升高而增加; L-亮氨酸形成DCAce的过程包括8个步骤,经过取代、氧化、断键、氨基重氮化和还原等一系列复杂的反应后,最终形成DCAce. |
| 英文摘要 |
| A novel method using methyl tertiary butyl ether (MTBE) as extractant and 1, 2-dibromopropane as internal standard for the determination of the disinfection by-producs 1, 1-dichloroacetone (DCAce) by gas chromatography mass spectrometry(GC-MS) was described. The formation process of DCAce and its influencing factors were discussed with L-leucine as the precursor during the chloramination process. The results indicated that the DCAce production increased with the increase of chloramine dosage when the chloramine addition was in the range of 5-30 mg ·L-1. The DCAce amount produced under alkaline condition was higher than those produced under the neutral and acidic conditions, and the DCAce amount reduced with the increase of pH value. Temperature was another important factor that affected the DCAce formation from methylamine especially in the range of 15-35℃, and the higher the temperature, the more the DCAce produced. The formation process of DCAce from L-leucine by chloramine consisted of a series of complicated reactions, including substitution, oxidation, bond breaking, amino diazotization, reduction and so on, and eventually DCAce was formed. |
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