Correlation of saturation vapor pressure and test chamber experiments for estimation of concentrations in indoor air

Abstract
The vapor pressure is an important parameter for estimating the fate of chemical substances in the indoor environment. For compounds of low volatility, a combination of the KNUDSEN effusion method and the LANGMUIR free evaporation method enables the precise measurement of vapor pressures over a wide temperature range. This is demonstrated for the fungicides Dichlofluanid and Tolylfluanid and the insecticide a-Endosulfan. Saturation concentrations were estimated and compared with results from test chamber experiments carried out under indoor conditions.