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微量甲烷碳同位素分析要求甲烷与空气,二氧化碳完全分离。因为空气中的氮气被氧化炉氧化成氮的氧化物将影响甲烷生成的二氧化碳的质谱测定。气相色谱分离空气,甲烷和二氧化碳多用吸附柱或高分子微球柱。甲烷与二氧化碳完全分离不成问题,但要将甲烷与空气分离得能用阀门完全切割是困难的。国外用从—70℃开始程序升温的办法解决这个问题。这样做既消耗大量液氮又费时间。因此我试验在常温下实现完全分离的条件。
Trace methane carbon isotope analysis requires methane and air, carbon dioxide completely separated. Because the nitrogen in the air is oxidized by the oxidation furnace into a nitrogen oxide, it will affect the mass spectrometry of methane-generated carbon dioxide. Gas chromatographic separation of air, methane and carbon dioxide adsorption column or polymer microspheres. The complete separation of methane from carbon dioxide is not a problem, but it can be difficult to completely cut the valve with air by using a valve. Foreign from -70 ℃ temperature program to solve this problem. Doing so consumes a lot of liquid nitrogen and takes time. So I tested the conditions for complete separation at room temperature.