电解质可提高顶空气相色谱法分析灵敏度

Increased Sensitivity of Head Space Gas Chromatography by Adding the Electrolyte

顶空气相色谱法对水中的微量挥发性有机物具有较好的分析效果,但因为各种有机物的挥发性不同,单纯控制温度和时间来提高分析灵敏度效果并不好。现以乙苯为例,适当加入一些电解质,乙苯的最低检出限为1.0×10-6mg/L时,变异系数CV为1.13%,分析效果更准确。

Abstract： The head space gas chromatography method has excellent analysis effects to trace volatile organic compounds in the water. It is found that there is bad effect on increasing the sensitivity of the method only by controlling the temperature and the time because there is different volatility with different organic compounds. However, when adding the electrolyte into the ethylbenzene, the analysis results become more accurate with the lowest detection limit of 1.0 × 10^-6 mg/L of the ethylbenzene and the coefficient of variation of 1.13%.