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目的建立水中21种苯系物和氯苯类化合物的顶空-气相色谱测定方法。方法向10 ml水样中加入3.8 g氯化钠,60℃平衡30 min后,采用HP-INNOWAX色谱柱分离,进行顶空-气相色谱测定,采用火焰离子化检测器(FID)检测,外标法定量。结果水中21种苯系物和氯苯类化合物分离效果好,在1～100μg/L线性范围内,所得回归方程均呈良好的线性关系,r≥0.999 7,方法检出限为0.30～1.18μg/L。该方法的平均回收率为89.1%～112.8%,RSD为0.95%～9.68%。结论该方法具有经济、操作简便、快速准确、干扰少的特点,适用于同时测定水中21种苯系物和氯苯类化合物。
Objective To establish a method for the determination of 21 kinds of benzenes and chlorobenzenes in water by headspace-gas chromatography. Methods 3.8 g sodium chloride was added to 10 ml water sample and equilibrated at 60 ° C for 30 min. The residue was separated on a HP-INNOWAX column and analyzed by headspace-gas chromatography with flame ionization detector (FID) Legal quantity. Results The separation efficiency of 21 kinds of benzene and chlorobenzenes in water was good, and the linear regression equation was obtained in the linear range of 1 ~ 100μg / L, r≥0.9997, the detection limit was 0.30 ~ 1.18μg / L. The average recoveries of this method ranged from 89.1% to 112.8% with RSDs ranging from 0.95% to 9.68%. Conclusion The method has the characteristics of economy, simple operation, fast and accurate, less interference and is suitable for the simultaneous determination of 21 kinds of benzene and chlorobenzenes in water.