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1.导言过去十年中,几个实验室都试过用质谱仪来测定各种媒质中生理性气体的分压。特别是,所有生理性气体的分压都能连续、快速记录下来。而方法上只需通过一根联到质谱仪上的特制取样管从血流中吸取一定量气体即可。这项技术的难点在于测定的定量化以及如何克服抽空现象;抽空现象可以定义为取样管的取样率大于媒质对取样气体分子的补充率,从而导致测定值比实际的真正分压值要低。本文作者在1974年发表的资料中所介绍的技术改进使得抽空现象减少了。当时所作
1. Introduction Over the past decade, several laboratories have tried mass spectrometry to determine the partial pressures of physiological gases in various media. In particular, the partial pressure of all physiological gases can be continuously and quickly recorded. The method only through a special sampling tube connected to the mass spectrometer to draw a certain amount of gas from the blood flow can be. The difficulty of this technique lies in quantifying the measurement and how to overcome the evacuation phenomenon. The evacuation phenomenon can be defined as that the sampling rate of the sampling tube is larger than that of the medium to the sampling gas molecules, resulting in the measured value being lower than the actual true partial pressure. The technical improvements introduced by the author in his 1974 paper led to a reduction in time-out. Made at that time