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The specific retention volumes of 20 solutes in squalane coated on a silanized diatomite have been measured at 25 and 50 OC by varying the sample size for each packed column of different liquid loadings. The values for the limiting specific retention volumes extrapolated to zero sample size are slightly dependent upon the liquid loading ratio, which is attributed to the solute-solvent coadsorption on the solid surface. Polar solutes such as alcohols, acetonitrile, ketones, acetates, and ether indicate gas-liquid interface adsorption in the region of small sample size; the extrapolation to zero sample size has been carried out from the solution dominating region of large sample size. The activity coefficients in bulk-liquid squalane have been calculated from the intercepts of the plots of the limiting specific retention volume against the reciprocal liquid loadlng ratio. The experimental activity coefficients are compared with the predictions of the UNIFAC and the ASOG methods.