二氯甲烷中的防腐剂环己烯对氯化饮用水液-液萃取及分析的影响。
The effect of cyclohexene, a preservative in dichloromethane on the liquid-liquid extraction and analysis of chlorinated drinking water.
作者信息
Ibrahim E A, Lippincott R L, Brenner L, Suffet I H, Hannah R E
出版信息
J Chromatogr. 1987 Apr 29;393(2):237-53. doi: 10.1016/s0021-9673(01)94221-9.
Liquid-liquid extraction with dichloromethane is the Environmental Protection Agency's (EPA) method of choice for the analysis of acid or base neutral organic chemicals in water. Free radical chlorination and oxidation products of cyclohexene (the solvent preservative) in dichloromethane have been observed in extracts of chlorinated drinking water (after 10(5) fold concentration) by gas chromatography and gas chromatography-mass spectrometry. The chlorinated cyclohexene derivatives limit the quantitative and qualitative analysis of compounds eluting at Kovát's index less than 700-1000 and the use of these extracts for organoleptic and mutagenic studies. The effect of residual free chlorine in water on the cyclohexene present in the solvent was studied. Over ten cyclohexene derivatives were produced in every case when any residual free chlorine was present in the water. When chlorine is reduced to chloramine, the cyclohexene derivatives were greatly reduced in number and amount.
用二氯甲烷进行液液萃取是美国环境保护局（EPA）用于分析水中酸性或碱性中性有机化学品的首选方法。通过气相色谱和气相色谱 - 质谱法在氯化饮用水提取物（经过10^5倍浓缩）中观察到二氯甲烷中环己烯（溶剂防腐剂）的自由基氯化和氧化产物。氯化环己烯衍生物限制了在科瓦特指数小于700 - 1000时洗脱的化合物的定量和定性分析，以及这些提取物用于感官和致突变性研究。研究了水中残留游离氯对溶剂中存在的环己烯的影响。当水中存在任何残留游离氯时，每种情况下都会产生十多种环己烯衍生物。当氯还原为氯胺时，环己烯衍生物的数量和含量大大减少。
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