离线超临界流体萃取和气相色谱-红外-质谱联用测定水中有机污染物

Determination of Organic Pollutants in Water by Off Line Supercritical Fluid Extraction Gas Chromatography/ Infrared Spectrometry/Mass Spectrometry

利用吸附剂ＧＤＸ－３０１对黄河水中的有机污染物富集并以超临界ＣＯ２脱附后，通过气相色谱、色谱－红外－质谱联用技术对各目标分析物逐一定性，并比较了超临界ＣＯ２萃取和溶剂洗脱的结果。实验表明，在２０ＭＰａ，６０℃，４０ｍｉｎ条件下进行超临界ＣＯ２萃取时的萃取效率和溶剂萃取效率相当或略高。

A supercritical fluid extraction (SFE) method using carbon dioxide for the determination of organic pollutants in Yellow River water was developed. In this paper, organic contaminants in 3L Yellow River water were concentrated on 1g GDX 301 adsorbent and then eluted from the adsorbent with supercritical CO 2. The analytes extracted by SFE were collected into lmL alcohol collecting solvent through a SiO 2 restrictor (35cm×50μm i.d.). Finally, the collecting solvent was analyzed by Gas Chromatography/Infrared Spectrometry/Mass Spectrometry. The SFE conditions which were optimized for removal of the analytes from adsorbent were 20MPa, 60℃ and 40min. The extraction efficiencies of SFE were directly compared to those obtained by using 15mL dichloromethane elution. Efficiencies of SFE under conditions of 20MPa, 60℃ and 40min were generally higher than those of solvent elution.