DETERMINATION OF VAPOR-PRESSURE, WATER SOLUBILITY, GAS-WATER PARTITION-COEFFICIENT P-GW, HENRYS LAW CONSTANT, AND OCTANOL-WATER PARTITION-COEFFICIENT P-OW OF 26 ALKYL DINITRATES

The octanol-water partition coefficient (P-OW), water solubility (S-H2 O) and vapor pressure of the sub cooled liquid (p(L)(0)) have been det ermined for 26 alkyl dinitrates. The octanol-water partition coefficie nts range from log P-OW = 1.4 for 1,2-ethyl dinitrate to log P-OW = 5. 9 for 1,2-decyl dinitrate, respectively. The experimental results agre e, within +/- 0.15 log units, with calculations of log P-OW by the inc rement method according to Hansch and Lee. Water solubilities are in t he range of 154 mol m(-3) (23.1 g L-1) for 1,2-ethyl dinitrate and 0.0 02 mol m(-3) (0.5 mg L-1) for 1,2-decyl dinitrate, respectively. The v apor pressures p(L)(0) range from 150.5 Pa for 1,2-propyl dinitrate to 0.01 Pa for the 1,10-decyl dinitrate. The Henry's law constants expre ssed as the gas-water partition constants P-GW (dimensionless) ranges from P-GW = 0.0003 for 1,3-propyl dinitrate up to P-GW = 0.020 for 1,2 -decyl dinitrate. The knowledge of the physico-chemical parameters all ows modelling of the multiphase distribution of this new class of orga nic atmospheric trace compounds in the environment. (C) 1998 Elsevier Science Ltd. All rights reserved.