In modelling the transport and fate of environmentally important chemicals, knowledge of physicochemical parameters such as the saturated vapor pressure (p⁰) and heat of vaporization (D_vapH_m) is critically important. In spite of that, direct measurements of the properties for higher-boiling substances at 298.15 K have been limited to a relatively small number of compounds and, due to experimental difficulties in the low-pressure region (p⁰ < 1 kPa), some of these measurements are of doubtful accuracy. Gas chromatography (GC) is an alternative method for measuring p⁰ and D_vapH_m data, offering advantages in terms of speed, size of solute sample, purity and stability requirements. In this article, several equations proposed to relate GC elution characteristics for low-volatility liquid and solid chemicals to their saturated vapor pressures and heats of vaporization are analyzed and compared. The results support the view that capillary GC is capable of providing D_vapH_m and p⁰ data for non-polar and slightly polar compounds with relative errors of about ± 1-2 % (D_vapH_m) and ± 10-15 % (p⁰) if the method and reference standards are properly selected. Then, the errors are either comparable with or lower than those resulting from more cumbersome direct experimental techniques.