Measurement of Dimensionless Henry's Law Constants of some Aromatic Compounds using a Headspace Sampler with a Gas Chromatography

摘要

Dimensionless Henry's law constants of aromatic compounds in water were measured ar various temperatures between 318.15-355.15 UK using a headspace autosampler with a gas chromatography.This measuring system prevent,sample losses due to volatilization from equilibration,sampling,and chemical concentration analysis by a high precision headspace sampler and gives relatively accuarate results.Dimensionless Henry's law constant is calculated by thermodynamic relation and the mass balance with gas chromatographic peak area.Different equilibrium concentration in gas phase was made by using different gas-liquid volume ratio in sample vial.The temperature dependence on dimensionless Henry's law constant was correlated with the classical van't Hoff equation as a function of temperature.The extrapolated data at 298.15 K from correlation equation were compared with available literature data in order to test this method.