Solubility of acetylene in human blood determined by mass spectrometry

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Abstract
To measure the acetylene solubility (.alpha.C2H2) in human blood, a blood sample, which had been equilibrated with a gas mixture containing C2H2, was injected into an airtight acetylene-free vessel, and the gas partial pressure was measured by mass spectrometry after reequilibration. The system was calibrated by injecting into the vessel a known volume of the equilibrating gas mixture. At 37.degree. C, .alpha.C2H2 averaged 0.768 .+-. 0.004 SD ml STPD [standard temperature and pressure, dry] .cntdot.ml blood-1.cntdot.atm-1, which is only slightly above the data from the literature. [This technique is applied to the measurement of pulmonary blood flow.].