二卤代乙腈在水溶液和加标饮用水样品中的分解

Decomposition of dihaloacetonitriles in water solutions and fortified drinking water samples.

作者信息

Nikolaou A D, Golfinopoulos S K, Kostopoulou M N, Lekkas T D

机构信息

Department of Environmental Studies, University of the Aegean, Mytilene, Greece.

出版信息

Chemosphere. 2000 Oct;41(8):1149-54. doi: 10.1016/s0045-6535(00)00025-4.

DOI:10.1016/s0045-6535(00)00025-4

PMID:10901239

Abstract

An investigation of the decomposition of dihaloacetonitriles (DHANs) in water solutions and fortified drinking water samples was conducted. The concentrations of dichloroacetonitrile (CHCl2CN, DCAN), bromochloroacetonitrile (CHBrClCN, BCAN) and dibromoacetonitrile (CHBr2CN, DBAN) were determined by a gas chromatography mass spectrometry (GC-MS) method at regular time intervals and different temperatures. The effect of sodium thiosulfate (Na2S2O3), which is used as a preservative in water samples, was also examined. The rates of decomposition were determined for each compound. The results show that the reactions are faster in fortified drinking water samples than in ultrapure water solutions. They are also favored at higher temperature, especially when sodium thiosulfate is present. The highest decomposition rate is shown by DCAN, followed by BCAN and DBAN, while at the presence of sodium thiosulfate the decomposition of DBAN is the fastest.

摘要

对二卤代乙腈（DHANs）在水溶液和加标饮用水样品中的分解情况进行了研究。采用气相色谱-质谱联用（GC-MS）法，在不同温度下按固定时间间隔测定二氯乙腈（CHCl2CN，DCAN）、溴氯乙腈（CHBrClCN，BCAN）和二溴乙腈（CHBr2CN，DBAN）的浓度。还考察了作为水样防腐剂的硫代硫酸钠（Na2S2O3）的影响。测定了每种化合物的分解速率。结果表明，加标饮用水样品中的反应比超纯水样品中的反应更快。高温下反应更易发生，尤其是存在硫代硫酸钠时。DCAN的分解速率最高，其次是BCAN和DBAN，而在硫代硫酸钠存在的情况下，DBAN的分解最快。