固相微萃取/气相色谱/质谱联用测定水中的2,4-二硝基苯酚

研究了水中痕量2，4-二硝基苯酚的固相微萃取（SPME）方法，得到了2，4-二硝基苯酚的SPME最佳萃取条件：水溶液调pH2，并用NaCl他和，在室温下直接萃取30min，气相色谱／质谱分析时，纤维探针在270℃下脱附3min。所建立的方法适于快速、方便地测定水中2，4-二硝基苯酚，不需浓缩和预处理。

Determination of 2,4-Dinitrophenol by Solid-Phase Microextraction Coupled to GC/MS

Solid-phase microextraction coupled GC/MS was investigated for the determination of 2,4-dinitrophenol in aqueous sample. Analytes were extracted by a 85 microns polyacrylate coated fiber. The fiber was then transferred into the injector of GC. Analytes were thermally desorbed and detected by GC/MS. The influences of several parameters on SPME procedure have been studied. The optimization condition was obtained: directly sampling in the water sample with the extraction period was 30 min and the desorption time 3 min at 270 degrees C. Acidification by hydrochloric acid (pH 2) and saturated salt were necessary for the best sensitivity. The precision of SPME is better than that of liquid-liquid extraction. This method is a fast, simple, and pre-concentration-free technique, which is suitable for detecting 2,4-dinitrophenol in water sample.