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化学法分析燃气组分时,C02为什么必须放在首位吸收?

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正确答案:

1)吸收O2用的焦性没食子酸碱性溶液中KOH会与C02起反应。

2)吸收CnHm用的发烟硫酸中S03气体会带出混入燃气,使以C02为代表的酸性气体总量增加。

3)吸收舶用的氨性氯化亚铜溶液中含氨水会与C02起反应。所以,只有把吸收C02的吸收瓶放在第一位,最先吸收才能得到准确结果。

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