ABSTRACT
A microtonometric method is described whereby tensions of carbon dioxide, oxygen and nitrogen can be determined in fluid samples of 0·3 ml. volume or less, each determination taking 20·25 min.
Replicate determinations of the tensions of carbon dioxide, oxygen and nitrogen give maximum coefficients of variability of 3·0, 2·2 and 1·2%, respectively.
A comparison of the present method with a micro-Winkler method for the determination of dissolved oxygen shows a close agreement; the mean percentage difference being 3·0.
Following Krogh the word ‘tension’ is used in reference to dissolved gas, the word ‘pressure’ in reference to the gas phase.
By Messrs Burroughs Wellcome and Co., London.
The absorption coefficient of a gas in a liquid is the volume of that gas (reduced to N.T.P.) absorbed by one volume of the liquid when the pressure of the gas itself amounts to 760 mm.
