Abstract
IN a recent communication, Ray1 has given the equations: 
and 
which he then combines and discusses. In these equations, the left-hand side of (1) is proportional to the sensitivity of a catharometer ; λ1 and λ2 are the thermal conductivities of carrier gas and vapour respectively; λ12 is the thermal conductivity of the mixture of the carrier gas with a fraction (assumed here to be molar) x2 of vapour. Authors discussing this communication2 all appear to assume that equation 2 is sufficiently accurate to enable them to use it in discussion of experimental results. This assumption is not correct.
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References
Ray, N. H., Nature, 182, 1663 (1958).
Schmauch, L. J., and Dinerstein, R. A., Nature, 183, 674 (1959). Wiseman, W. A. ; Eden, M., Karmen, A., and Stephenson, J. L. ; Scott, B. A., and Williamson, A. G., Nature, 183, 1322–24 (1959).
Chapman, S., and Cowling, T. G., ‘The Mathematical Theory of Non-uniform Gases’, 2nd edit. (Camb. Univ. Press, 1952).
Hoffmann, E. G., Z. Anal. Chem., 164, 182 (1958).
Rosie, D. M., and Grob, R. L., Anal. Chem. 29, 1263 (1957).
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LITTLEWOOD, A. Sensitivity of Catharometers in Gas Chromatography and the Thermal Conductivity of Binary Gas Mixtures. Nature 184, 1631–1632 (1959). https://doi.org/10.1038/1841631b0
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DOI: https://doi.org/10.1038/1841631b0
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