大气及液空、液氧中氧化亚氮测定方法的研究

Determination of N_2O in Air,Liquefied Air and Oxygen

建立了一种用电子捕获检测器气相色谱法（GC- ECD）测定大气及空气分离装置液空、液氧中N2O的测定方法.通过选择性条件试验,确定了用GC- ECD法测定大气及空气分离装置液空、液氧中N2O含量的最佳色谱柱为不锈钢填充柱,固定相为GDX-103（0.154～0.18 mm粒径）;最佳载气流速为18 mL/min,最佳分离的柱温为30℃.方法具有较高的灵敏度,检出限为：当进样量为0.5mL时,可测准至N2O浓度0.1 μL/L的气体,检出限为0.014 μL/L.方法的准确度较高,以峰面积定量,其标准偏差为0.013;相对标准偏差为3.74%.

The method of gas chromatography-electron capture detection （GC-ECD） N2O in air, liquefied air and liquefied oxygen was studied and set up. The chromatography were chosen by a lot of tests . The best column is GDX-103 （0. 154 The rate of carrier gas is 18 mL/min. The temperature of column is 30℃. This method precision. The detection limit can reach up to 0. 014 μL,/L with a RSD of 3.7%. for the determination of optimum conditions of -0.18 mm pore size）. has high sensitivity and