色谱

色谱

• 特别策划 • 上一篇    下一篇

新型水蒸气顶空富集装置在饮用水中痕量挥发性有机物非目标筛查中的应用

马慧莲, 张海军, 田玉增, 王龙星, 陈吉平*   

  1. 中国科学院大连化学物理研究所, 辽宁 大连 116023
  • 收稿日期:2011-07-29 修回日期:2011-08-07 出版日期:2011-09-28 发布日期:2011-10-28
  • 通讯作者: 陈吉平,研究员,主要研究方向为环境分析化学. Tel: (0411)84379686
  • 基金资助:

    国家水体污染控制与治理科技重大专项(2009ZX07527-005)

A novel vapor dynamic headspace enrichment equipment for nontarget screening of volatile organic compounds in drinking water

MA Huilian, ZHANG Haijun, TIAN Yuzeng, WANG Longxing, CHEN Jiping*   

  1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
  • Received:2011-07-29 Revised:2011-08-07 Online:2011-09-28 Published:2011-10-28

PDF

496

摘要： 以饮用水中痕量挥发性有机物(VOCs)非目标筛查为目的,构建了一种新型的大体积水样高倍富集装置。对其精馏管长度、回收冷凝液体积、吸收介质等影响富集效果的关键因素进行了优化。该装置以水蒸气为吹扫气,同时以水作为吸收剂,将1 L水样富集浓缩至5 mL后,可使原有吹扫捕集-气相色谱-质谱法(P&T-GC-MS)分析VOCs的灵敏度提高1～2个数量级。用该方法对某净水厂的源水与出厂水进行了痕量VOCs的定性分析与比较。与传统P&T-GC-MS方法相比,本方法对两种水样的污染物检出数目由原来的无检出和5种分别提高至16种和35种。分析结果表明饮用水消毒前后污染物的种类及含量存在显著差异。

关键词: 吹扫捕集, 非目标筛查, 挥发性有机物, 水蒸气顶空富集, 饮用水

Abstract: A novel vapor dynamic headspace enrichment device was set up for nontarget screening of volatile organic compounds (VOCs) in drinking water. The main operating parameters of this device, such as length of distillation tube, volume of collected condensate, and choice of absorbent, were optimized. In this device, vapor was utilized as a purge gas and water was utilized as a absorbent. With the help of the device, one liter of water sample could be concentrated to 5 mL and the sensitivity of traditional purge and trap-gas chromatography-mass spectrometry (P&T-GC-MS) could be improved 1~2 orders of magnitude. Source and disinfected water samples from a water treatment plant were analyzed with this method. Compared with the traditional P&T-GC-MS analysis without pre-enrichment, the numbers of identified VOCs were improved from 0 to 16 for source water and 5 to 35 for disinfected water samples. It is also shown that there are many halide compounds in VOCs in disinfected water which do not exist in source water.

Key words: drinking water, nontarget screening, purge &, trap, vapor dynamic headspace enrichment, volatile organic compounds