废气中乙酸酯类的热脱附GC-MS测定法

Determination of Acetic Esters in Waste Gas by Thermal Desorption GC-MS

使用固相吸附-热脱附GC-MS法来测定固定污染源废气中的乙酸甲酯、乙酸丙酯。通过用吸附管采样,用热解析脱附,经气相色谱分离后用质谱测定,外标法定量。实验得出目标物出峰完好尖锐,回收率在94.2%~110.8%之间,各组分检出限在0.006~0.007mg/m3之间,精密度在4.8%~6.1%之间。结果表明该方法可对固定污染源废气中的乙酸甲酯、乙酸丙酯进行定性、定量测定,检测效率高,方法科学可靠。

Solid phase adsorption-thermal desorption GC-MS method was used to determine methyl acetate and propyl acetate in the exhaust gas of stationary pollution sources. The samples were collected by adsorption tube, desorbed by thermal analysis, separated by gas chromatography, determined by mass spectrometry, and quantified by external standard method. The results showed that the peak of the target substance was intact and sharp, the recovery was between 94.2% and 110.8%, the detection limit of each component was between 0.006~0.007 mg/m 3, and the precision was between 4.8% and 6.1%. The results showed that the method can be used for the qualitative and quantitative determination of methyl acetate and propyl acetate in the exhaust gas of fixed pollution sources.