车间空气中正丁醇的气相色谱测定方法研究

Study of an analytical method for butyl alcohol in workplace air by GC

使一定量现场空气通过活性炭采样管以采集正丁醇。用含1％异丙醇的二硫化碳溶液解吸,取解吸的样品溶液注入气相色谱仪。测量峰高,并与注入标准所得峰高相比较,计算空气中正丁醇的含量。在给定的实验条件下,方法的变异系数低于1.6％,解吸效率平均为97.9％,100mg活性炭对正丁醇的穿透容量为15.03mg,检测限为5.3×10^(-4)μg。经过现场测试,本方法可用于工业卫生监测。色谱条件:2m不锈钢柱,充填10％FFAP/chromosorb W-AW(60～80目);载气(N_2)50ml/min;柱温80℃:检测室温度180℃。

A Known volume of air was drawn through a charcoal tube to trap butyl alcohol present. Then the analyte wes desorbed with carbon disulfide containing 1% iso-propyl alcohol. An aliquot of the desorbed sample was injected into a Gas chromatograph. The height of the resulting peak was determined and compared with heights obtained from injection of standards. Uuder the experiment conditions the variation coefficient of the method was less than 1.6%, and desorption efficiency, breakthrough capacity and detection limit were 97.9%, 15.03mg/100mg charcoal and 5.3×10^(-4)μg, respectivelg. Through the field-test, the method can be used in monitoring for industrial hygiene. GC conditions: flame ionization detector, Column (2m stainless steel)packed with 10%FFAP on 60/80 mesh chromosorb W-AW, 50ml/min Nitrogen Carrier gas flow, 80℃ column temperature, 180℃ manifold temperature.