Vorosmarti J, Barnard E E, Williams J, de G Hanson R
Undersea Biomed Res. 1978 Sep;5(3):243-52.
Nitrogen elimination was measured in six divers during steady-state exposures in an oxygen-nitrogen atmosphere at 1, 2, and 3 ATA using both oxy-helium and pure O2 as washout gases. This was accomplished by using mass spectrometry to measure the expired N2 concentration breath-by-breath over periods of 120 min in all experimental conditions except for O2 breathing at 3 ATA, which was limited to 30-min periods. In all cases the area under the elimination curve increased with pressure. Total area under the curve was also greater when breathing O2 than when breathing oxy-helium, but this difference decreased with depth and washout time. Nitrogen elimination on a semilogarithmic plot falls rapidly during the first four minutes and then shows a slow linear fall for the remainder of the measurement period. Effective elimination of nitrogen decreased with depth and oxygen was more effective than oxy-helium in washing out nitrogen at all depths studied. Possible causes of the different variations noted in the washout curves during the experiment are discussed.
在1、2和3个绝对大气压（ATA）的氧氮环境中，对6名潜水员进行稳态暴露时，使用氧氦混合气和纯氧作为冲洗气体来测量氮的排出量。这是通过质谱法在除3 ATA下呼吸纯氧（该情况限于30分钟时间段）之外的所有实验条件下，逐次呼吸测量120分钟时间段内呼出的氮气浓度来实现的。在所有情况下，排出曲线下的面积随压力增加。呼吸纯氧时曲线下的总面积也比呼吸氧氦混合气时更大，但这种差异随深度和冲洗时间而减小。在半对数图上，氮的排出在最初四分钟内迅速下降，然后在测量期的剩余时间内呈缓慢线性下降。有效氮排出量随深度降低，并且在所有研究深度下，氧气在冲洗氮气方面比氧氦混合气更有效。文中讨论了实验期间冲洗曲线中观察到的不同变化的可能原因。
