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本文提出一简便的气相色谱法,用于分析丁二烯中含2-100ppm的气体杂质.采用高灵敏度钨丝热导池作鉴定器,用5埃分子筛作吸附剂而分离H_2,O_2,N_2,CO,CH_4.用丁酮酸乙酯为固定液使CO_2和所有气体烃分离.又讨论用热导池作鉴定器时,影响气相色谱法最小鉴知量的各种因素.这分析方法的最小鉴知量为0.02微升H_2,0.1微升O_2,0.3微升N_2,0.4微升CO,0.4微升CH_4,0.3微升CO_2,0.2-0.9微升气体烃.分析氢时的取样10毫升,分析O_2,N_2,CO,CH_4时50毫升,分析CO_2和气体烃时为13毫升.此时最小鉴知浓度分别为2ppm H_2,2ppm O_2,6ppm N_2,8ppm CO或CH_4,20ppm CO_2和14-74ppm气体烃,
In this paper, a simple gas chromatographic method is proposed for the analysis of gas impurities containing 2-100 ppm of butadiene, using high-sensitivity tungsten filament thermal conductivity cell as a detector and using 5 Å molecular sieve as adsorbent to separate H 2, O 2 and N 2 , CO, CH_4. Using ethyl butyrate as a stationary phase, CO_2 was separated from all gaseous hydrocarbons, and various factors affecting the minimum gas chromatographic identification when using a thermal conductivity cell as a detector were discussed. The minimum assay volume was 0.02 μl H2, 0.1 μl O2, 0.3 μl N2, 0.4 μl CO, 0.4 μl CH4, 0.3 μl CO 2, 0.2-0.9 μl gaseous hydrocarbon and 10 ml , 50 ml of O 2, N 2, CO and CH 4 were analyzed, and 13 ml of CO 2 and gaseous hydrocarbons were analyzed.The minimum concentration was 2 ppm H 2, 2 ppm O 2, 6 ppm N 2, 8 ppm CO or CH 4, 20 ppm CO 2 and 14- 74ppm gas hydrocarbon,