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天然水中的 He、H_2、N_2、O_2、CH_4和 CO_2等气体成分具有重要的水文地球化学意义。气相色谱法为快速准确地分析这些气体提供了有力的手段。由于 CO_2的极性较强,在5 A 分子筛柱上发生不可逆吸附,故目前多用程序升温或用两根色谱柱(一根充填5 A 分子筛,另一根充填硅胶或活性碳)来完成上述组分的分离测定。这样对测定精度有一定影响,分析周期也较长,或对仪器要求较高(具有程序升温装置或双柱双检测系统)。我们通过试验,用一根 GDX—105柱对 He、H_2、N_2、CH_4和 CO_2进行一次分离测定,取得了满意的效果。
Natural gas He, H_2, N_2, O_2, CH_4 and CO_2 and other gas components have important hydrogeochemical significance. Gas chromatography provides a powerful tool for analyzing these gases quickly and accurately. Due to the strong polarity of CO2, irreversible adsorption occurs on the 5 A molecular sieve column. Therefore, the temperature is currently increased by multiple procedures or by using two columns (one packed with 5 A molecular sieve and the other filled with silica gel or activated carbon) The separation of the determination. This has a certain impact on the measurement accuracy, analysis cycle is longer, or higher on the instrument (with temperature programmer or double column dual detection system). We tested the separation of He, H_2, N_2, CH_4 and CO_2 by a GDX-105 column and achieved satisfactory results.