气相色谱法同时测定混合溶液中7种硝基苯

Simultaneous determination of 7 nitrobenzenes in mixed solutions by gas chromatography

建立了气相色谱法测定甲醇中邻二硝基苯、间二硝基苯、对二硝基苯、邻硝基氯苯、间硝基氯苯、对硝基氯苯、2,4-二硝基氯苯7种硝基苯混合溶液的方法。采用Rxt-5MS型色谱柱(30 m×0.25 mm,0.25μm),设置程序升温,使用FID检测器进行测定,分析了7种硝基苯的色谱保留时间与理化性质的关系。7种硝基苯的质量浓度在10~200μg/mL范围内与色谱峰面积线性关系良好,相关系数均大于0.999,方法检出限为0.003~0.007μg/mL。测定结果的相对标准偏差为0.62%~4.03%(n=6),样品加标回收率为95.7%~101.4%。该方法适用于环境中硝基苯检测。

A method for the determination of 7 nitrobenzenes in methanol by gas chromatography was established.Rxt-5MS column(30 m×0.25 mm,0.25μm)was used.The relationship between chromatographic retention time and physicochemical properties of 7 nitrobenzenes was analyzed.The mass concentration of 7 nitrobenzenes had a good linear relationship with the chromatographic peak area in the range of 10-200μg/mL.The correlation coefficients were all more than 0.999.The detection limits were 0.003-0.007μg/mL.The relative standard deviation of determination results was 0.62%-4.03%(n=6),and the recovery was 95.7%-101.4%.This method is suitable for the determination of nitrobenzene in environment.