小量水样痕量苯酚的液-液微萃取气相色谱分析

 建立了小量水样痕量苯酚的液 液微萃取气相色谱分析法。考查了乙酸乙酯在酸和盐的作用下对苯酚的萃取性能 ,优化了萃取过程。采用FID检测器、WBI 17直接进样口和DB 1宽口径弹性石英毛细管柱 ,通过快速进样和汽化室内填装适当的玻璃棉可以得到满意的定量精密度。 8mL水样、16 0 μL乙酸乙酯、3 5 g硫酸铵可获得 1μg/L的检测下限 ,加标回收率为 95 0 %～ 98 5 % ,RSD为 2 8%～ 3 3%。

Study on Analysis of Trace Phenol in Small Amount of Aqueous Sample by Liquid-Liquid Micro-Extraction and Gas Chromatography

A method for the liquid-liquid micro-extraction and gas chromatographic analysis of trace phenol in small amount of aqueous sample has been developed. The influences of acid and salts on recovery rate of phenol were examined. And, the influences of injection speeds and the conditions of silica wool in injection port on the quantitation precision were tested. With a direct injection port, an FID and a DB-1 capillary column of wide bore, a detection limit of 1 microgram.L-1 can be obtained employing 8 mL water sample, 160 microL ethyl acetate and 3.5 g ammonium sulfate. The added recoveries were in the range of 95.0%-98.5%. The relative standard deviations were in the range of 2.8%-3.3%. This method is simple, convenient, rapid, accurate and practical.