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目前,在环保检测气体中的二氧化氮时,广泛地应用渗透管来获得二氧化氮标准气。关于电子捕获器气相色谱法测定微量二氧化氮的方法已有若干报导,但二氧化氮峰形对称性较差,检测ppm级的含量存在某些困难。本文应用FB-4型色谱仪及Carlo、Erha-D型电子捕获检测器脉冲电源,测定ppm级的二氧化氮浓度,分离峰形对称,与重量法比较,测得渗透管的渗透率数据,其最大偏差值不大于0.1微克/分。
At present, permeate tubes are widely used to obtain nitrogen dioxide standard gas when environmental testing for nitrogen dioxide in gases. Several methods have been reported for the determination of trace amounts of nitrogen dioxide by electron capture gas chromatography, but the symmetry of the peak shape of the nitrogen dioxide is poor and there are some difficulties in the detection of ppm levels. In this paper, the FB-4 chromatograph and the Carlo, Erha-D electron capture detector pulse power supply were used to measure the concentration of nitrogen dioxide in the ppm level. The separated peak shape was symmetrical. Compared with the gravimetric method, The maximum deviation of not more than 0.1 micrograms / min.