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[目的 ]研究炭管采集空气中丁醚的气相色谱分析方法。 [方法 ]活性炭吸附空气中丁醚 ,样品经加热解吸 ,色谱检测。 [结果 ]当空气中丁醚浓度范围在 2 69～ 10 77mg/m3 (参照美国标准 10 0ppm ,相当于 5 3 3mg/m3 )时 ,其方法的变异系数为 1 1% ,回归方程式y =96 1+17 79x ,r =0 9998,最低检测限 4 4× 10 -3 μg(进样 2ml)。平均解吸效率为97 3 % ;穿透容量 (BTV) 14 1mg。活性炭吸附 10 77μg丁醚后 ,样品放置一周 ,回收率仍可达 93 7%。本法的测定范围上限取决于炭管的吸附量 ,而该吸附量可随空气中丁醚的浓度及其它物质 (醚类 )而变化。 [结论 ]本方法可应用于车间环境中丁醚浓度的测定。
[Objective] The research aimed to study the gas chromatographic analysis method of carbon monoxide in air. [Method] Activated carbon was used to adsorb butylether in the air. The sample was heated and desorbed and detected by chromatography. [Result] When the concentration of butyl ether in the air ranged from 69 to 1077 mg / m3 (corresponding to the US standard of 10 0 ppm, equivalent to 533 mg / m3), the coefficient of variation of the method was 11% and the regression equation y = 96 1 + 17 79x, r = 0 9998, the lowest detection limit of 4 4 × 10 -3 μg (injection 2ml). The average desorption efficiency of 97 3%; penetration capacity (BTV) 14 1mg. After the activated carbon adsorbed 10 77 μg of butyl ether, the sample was allowed to stand for one week and the recovery rate still reached 93.7%. The upper limit of the scope of this Law depends on the amount of carbon nanotubes adsorbed, and the amount of adsorbed air with butyl ether concentration and other substances (ethers) and change. [Conclusion] This method can be applied to the determination of butyl ether concentration in workshop environment.