溶剂解吸-气相色谱法同时测定工作场所空气中乙酸乙烯酯和甲基丙烯酸甲酯

Simultaneous determination of vinyl acetate and methyl methacrylate in the air of workplace by solvent desorption-gas chromatography

目的建立同时测定工作场所空气中乙酸乙烯酯（VA）和甲基丙烯酸甲酯（MMA）的溶剂解吸-气相色谱方法。方法工作场所空气中的VA和MMA用对苯二酚浸渍活性炭吸附管采集,二硫化碳解吸,DB-FFAP毛细管气相色谱柱分离,火焰离子化检测器检测。结果本方法 VA和MMA分别在18.6~186.2和187.2~1 872.0 mg/L范围内线性关系良好,相关系数分别为0.999 97和0.999 98,最低检出浓度分别为0.7和0.8 mg/m3（以采集1.5 L空气样品计）,平均解吸效率分别为92.6%~97.8%和95.9%~99.1%,批间相对标准偏差分别为1.8%~2.6%和0.5%~2.2%,采样效率均为100.0%,样品在4℃冰箱中可保存7 d。结论本方法操作简便,灵敏度高,精密度和准确度好,适用于工作场所空气中VA和MMA的同时检测。

Objective To establish a method for simultaneous determination of vinyl acetate（ VA） and methyl methacrylate（ MMA） in the workplace air by solvent desorption-gas chromatography. Methods VA and MMA in the air of workplace were collected by dipped activated carbon tube absorption and desorbed with carbon disulfide,then separated by DB-FFAP capillary gas chromatography column and analyzed by flame ionization detector. Results The linear ranges of VA and MMA were 18. 6-186. 2 and 187. 2-1 872. 0 mg / L,and the correlation coefficients were 0. 999 97 and 0. 999 98,respectively. The minimum quantitative mass concentrations were 0. 7 and 0. 8 mg / m3respectively（ sample volume,1. 5L）. The average desorption efficiencies of VA and MMA were 92. 6%-97. 8% and 95. 9%-99. 1%,and the interassay relative standard deviation were 1. 8%-2. 6% 和 0. 5%-2. 2%,respectively. The sampling efficiency was 100. 0% and samples could be stored for 7 days in refrigerator at 4 ℃. Conclusion This method is simple,sensitive,precision,and accurate,and suitable for simultaneous detection of VA and MMA in the workplace air.