Abstract：
Volatile halogenated hydrocarbons (VHHs) are annually produced and released into the environment, posing a threat to public health. In this study, a simple, rapid, sensitive and automated method based on headspace and gas chromatography (GC) with electron-capture detection was described for the determination of VHHs in different concentration levels in water samples. The proposed headspace GC method was initially optimized, and the optimum experimental conditions found were 10-mL water sample containing 20% w/v sodium chloride placed in a 20-mL vial and stirred at 60°C for 35 min, and then 14 VHHs were well separated on DB-35 MS capillary column with a split ratio of 12.5: 1. The limits of detection were in the low μg/L level, ranging between 0.01 and 0.6 μg/L. Finally optimized method was applied for determination 14 VHHs in drinking and environmental waters. The total mean concentrations of VHHs were 34.962, 26.183, 3.228 and 647.344 μg/L in tap water, purified water with 1-year-old filter element, seawater and effluents, respectively. However, no VHHs was detected in purified water with a new filter element. The main composition is different among different water matrix, which may be attributed to their different sources.
摘要：
挥发性卤代烃（VHHs）每年产生并释放到环境中，对公众健康构成威胁。在这项研究中,一个简单的，快速,描述了基于顶空和电子捕获检测的气相色谱（GC）的灵敏自动化方法，用于测定水样中不同浓度水平的VHH。提出的顶空GC方法进行了初步优化，发现的最佳实验条件是将含有20％w/v氯化钠的10mL水样置于20mL小瓶中，并在60°C下搅拌35分钟，然后在DB-35MS毛细管柱上以12.5：1的分流比很好地分离了14个VHH。检出限在低μg/L水平，范围在0.01和0.6μg/L之间最后，将优化的方法应用于饮用水和环境水域中14种VHH的测定。自来水中VHHs的总平均浓度为34.962、26.183、3.228和647.344μg/L，纯净水与1年的滤芯，海水和废水，分别。然而,使用新的滤芯在纯净水中未检测到VHH。不同水基质的主要成分不同，这可能归因于它们的不同来源。
