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气体容量吸收法是测定常量气体组分的经典方法,但是,也容易造成误差。目前就产生误差原因进行分析报导尚少。我们通过测试,找出了产生误差的原因及其消除的方法。造成分析误差,除了取样点选择不当,温度、压力、量气管刻度不准、气流速度不一致等外,其中还有一个主要原因是梳型管道及导向吸收瓶支管存在,给分析结果带来误差。按照一般操作程序,先用待测气体试样冲洗梳型管道2～3次,赶走管内空气,然后正式取样100毫升,依次压入各吸收瓶,反复吸收完全。这样,实际上被吸收剂吸收的:分析试样中各组份气体,不仅仅是量气管中的分析试样,
The gas volumetric absorption method is the classic method of determining the composition of a constant gas, however, it is also prone to error. At present, there are still few reports on the causes of errors. We passed the test to find out the reasons for the error and its elimination method. In addition to improper sampling points, temperature, pressure, gas trachea calibration is not allowed, the air velocity is inconsistent, etc., one of the main reasons is the existence of the comb-type pipe and the guide absorption of the bottle branch, to bring the error analysis results. In accordance with the general operating procedures, first with the gas sample to be tested flushing comb-type pipe 2 to 3 times to get rid of the tube of air, and then formally sampled 100 ml, followed by pressing each absorption bottle, repeated absorption completely. In this way, in fact absorbed by the absorbent: the analysis of the sample gas in each component, not just the analysis sample in the trachea,