溶剂解吸-气相色谱法同时测定工作场所空气中2-甲氧基乙基乙酸酯和2-乙氧基乙基乙酸酯

Simultaneous determination of 2-methoxyethyl acetate and 2-ethoxyethyl acetate in workplace air by solvent desorption-gas chromatography

目的建立同时测定工作场所空气中2-甲氧基乙基乙酸酯(2-MEA)和2-乙氧基乙基乙酸酯(2-EEA)的溶剂解吸-气相色谱测定法。方法空气样品采用活性炭管采集,以1.0 mL体积分数为5.00%(V/V)甲醇-二氯甲烷溶液解吸,毛细管色谱柱分离,氢火焰离子化检测器测定。结果 2-MEA和2-EEA分别在质量浓度为1.50~2 403.84和1.79~2 871.20 mg/L时线性关系良好,相关系数均为0.999 8;最低定量浓度分别为0.20和0.09mg/m^3(以采集3.00 L空气计);平均解吸效率分别为98.08%~99.67%和94.34%~99.79%;批内相对标准偏差(RSD)分别为1.77%~3.51%和1.72%~3.01%,批间RSD分别为2.27%~4.44%和2.31%~4.19%。样品在室温下至少可保存14 d。结论本方法适用于工作场所空气中2-MEA和2-EEA的采样及检测。

Objective To establish a solvent desorption-gas chromatography method for simultaneous determination of 2-methoxyethyl acetate （2-MEA） and 2-ethoxyethyl acetate （2-EEA） in the workplace air.Methods 2-MEA and 2-EEA in workplace air were captured by charcoal tubes and desorbed with solution of 5.00% （V/V） methanol-methylene chloride,separated through capillary chromatographic column,and then analyzed by gas chromatography-flameionization detector.Results The linear ranges of 2-MEA and 2-EEA were 1.50-2 403.84 and 1.79-2 871.20 mg/L,respectively.The correlation coefficient were 0.999 8.The minimum quantification concentrations were 0.20 and 0.09 mg/m3,respectively （3.00 L sample）.The average desorption efficiencies were 98.08%-99.67% and 94.34%-99.79%,respectively.The within-run relative standard deviations （RSD） were 1.77%-3.51% and 1.72%-3.01%,respectively.The between-run RSD were 2.27%-4.44% and 2.31%-4.19%,respectively.The samples could be stored at room temperature for at least 14 days.Conclusion This method could be used for simultaneous sampling and quantitative detection of 2-MEA and 2-EEA in workplace air.