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

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 3 L Yellow River water were concentrated on 1 g GDX-301 adsorbent and then eluted from the adsorbent with supercritical CO2. The analytes extracted by SFE were collected into 1 mL alcohol collecting solvent through a SiO2 restrictor (35 cm x 50 microns 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 20 MPa, 60 degrees C and 40 min. The extraction efficiencies of SFE were directly compared to those obtained by using 15 mL dichloromethane elution. Efficiencies of SFE under conditions of 20 MPa, 60 degrees C and 40 min were generally higher than those of solvent elution.