工作场所空气中丙酸和丙烯酸的气相色谱同时测定法

目的建立工作场所空气中丙酸、丙烯酸的溶剂解吸气相色谱测定方法。方法采用硅胶管采集，丙酮解吸，经FFAP毛细管色谱柱分离，FID检测器检测的气相色谱测定方法。结果该方法丙酸、丙烯酸分离效果好，峰形尖锐；线性范围分别为1．9—1984和2．1—526．0mg／L，线性相关系数均大于0．999；检出限分别为1．9和2．1mg／L，最低检出浓度均为0．2mg／m3（以采集15L空气样品计）；方法的重现性好，相对标准偏差分别为0．4％-1．9％和0．4％-2．5％；平均解吸效率分别为89．0％-94．1％和83．6％-89．2％。结论该方法可完全适用于工作场所空气中丙酸、丙烯酸的同时测定。

Simultaneous determination of propionic acid and acrylic acid in the air of the workplace by gas chromatography

[ Objective ] To establish solvent desorption gas chromatographic method for determination of propionic acid and acrylic acid in the air of workplace. [ Methods ] After collection with silicagel tube, propionic acid and acrylic acid were desorbed with ace- tone, and then separated with FFAP capillary columns and detected with flame ionization detector[ Results] A satisfactory separation was obtained with sharp peak shape. The linearity ranges were 1.9-1 984 mg/L for propionic acid and 2.1-526.0 mg/L for acrylic acid. The linear correlation coefficients were both higher than 0 . 999. The limits of detection were 1.9 mg/L and 2. 1 mg/L re- spectively. And the minimum detectable concentrations were both 0.2 mg/m3 { 15 L air sample）. The method had a good reproduc- ibility, with relative standard deviations （RSD） of 0.4 % -1.9 % and 0.4 % -2.5 % respectively. The average desorption efficiencies were 89.0%-94.1% and 83.6%- 89.2%. [ Conclusion] The method is feasible for simultaneous determination of propionic acid and acrylic acid in the air of workplace.