Determination of Ethylene Glycol in Air and Waste Gas by Gas Chromatography Derived from Trifluorophenylboronic Acid
Ethylene glycol is a widely used compound in industrial manufacturing,with two hydroxyl groups in its molecular structure,strong polarity,and problems such as peak tailing and high detection limit often occur in the chromatographic analysis process.In order to explore better ethylene glycol detection conditions,this method tried to collect ethylene glycol in air and exhaust gas with silica gel tube,methanol as the desorption liquid,add 3,4,5-trifluorophenylboronic acid solution and ethylene glycol to form trifluorophenylborate at 80 ℃,and then gas chromatography instrument analysis was conducted.Derivatization can effectively improve the detection sensitivity of ethylene glycol,and at the same time improve the peak tailing phenomenon of ethylene glycol on the column.The method had good linearity in the concentration range of 0.30 µg/mL to 50 μg/mL,the correlation coefficient was 0.998,the detection limit was 0.12 µg/mL,the limit of quantification was 0.36 µ g/mL,the desorption volume was 2 mL.Based on short-term collection of 1.5 L of air,the lowest detection concentration was 0.16 mg/m3,the lowest quantitative concentration was 0.48 mg/m3,and the lowest detection concentration was 0.04 mg/m3 and the lowest quantitative concentration was 0.12 mg/m3 based on long-term sampling of 6 L of air.
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