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Clinical Chemistry 29: 884-886, 1983;
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Clinical Chemistry, Vol 29, 884-886, Copyright © 1983 by American Association for Clinical Chemistry

Osmometry of CO2 in gas samples

MS Oh, CS Kee, J Uribarri and HJ Carroll

Measurement of solute concentrations in biologic fluids by an osmometric technique has been described previously. Here, we describe an osmometric technique for measuring CO2 in gas samples. A solution of NaOH is injected into a graduated syringe containing the gas sample and CO2 is trapped in the reaction: 2NaOH + CO2 leads to Na2CO3 + H2O. The decrease in osmolality of the NaOH solution allows estimation of pCO2 in the original gas sample.




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Copyright © 1983 by the American Association for Clinical Chemistry.