Solvation descriptors have been obtained for 19 substituted 1,3,5-triazines, using literature data on water to solvent partitions, and our own experimental determinations of water to solvent partition coefficients and micellar electrokinetic chromatography (MEKC) retention factors. The solvation descriptors can then be used to predict environmentally important air to water partition coefficients, K(w), which are the reciprocal of Henry's Law constants, with due regard to units. For this class of chemistry it is shown that the values of log K(w) so obtained are generally in good agreement with the experimental values compiled in this work and also compare well with the calculated values from the established bond contribution method of Meylan and Howard as implemented in the EPI Suite, but not with calculated values from the semi-empirical quantum chemical solvation models, SM2 and SM3, recently reported by Delgado and Alderete (J. Chem. Inf. Comput. Sci., 2003, 41, 1226-1230).