气相色谱法测定环境中微量甲醇色谱柱的选择

ANALYSIS OF TRACE METHANOL IN ENVIRONMENT BY GAS CHROMATOGRAPH

甲醇是一种重要的化工原料 ,也是大气、水环境中一项重要的环境指标。本文主要针对气相色谱法分离柱及分离条件的选择进行论述 ,采用GDX - 10 2 (6 0 - 80 ) /2m色谱柱 ,在进样温度 15 0℃、柱温 10 0℃ ,载气N2 流速为 4 5ml/min ,H2 /Air比为 1/10的条件下 ,有效分离了甲醇、水及其它可能存在的干扰组分 ,如甲醛、乙醇、丙酮等。具有简便、快捷、灵敏度高、选择性好的优点。同时 ,对该色谱柱也作为甲醛的常量分析方法进行了探讨。

methanol is an important chemical raw material, and an essential monitoring item in atmosphere and water environment. This thesis focuses on the selection of chromatograph columns and analysis conditions. GDX-102(60-80)/2m column is selected, and the corresponding conditions are injection temperature 150℃, column temperature 100℃, N 2 rate 45ml/min, H 2/air ratio 1/10. Under these conditions, the column separates effectively the methanol with disturbance substance, such as H 2O, formaldehyde, ethanol and propanone etc. The column has the advanced character of simple, fast, high sensitivity and good selectivity, may be used to common analyses of formaldehyde.