In this paper, partition coefficients (distribution constants) of 14 organic compounds of environmental importance (frequently determined in indoor air) between the gas and liquid phase (polydimethylsiloxane, PDMS) are presented, determined by two gas chromatographic methods: isothermal elution and temperature programmed elution using the LTPRI (linear temperature programme retention index) approach. We examined applicability of this approach to polar compounds. We took efforts to ensure best possible accuracy and trace the possible sources of error. Precision was estimated by reproducing the results using four chromatographic columns differing in diameter and stationary phase coating thickness. We consider some factors influencing the determination of thermodynamic quantities by gas chromatography and suggest some improvements. (C) 2004 Elsevier Ltd. All rights reserved.