Henry’s law constant, octanol–air partition coefficient and supercooled liquid vapor pressure of carbazole as a function of temperature: Application to gas/particle partitioning in the atmosphere

The Henry’s law constant for carbazole was experimentally determined between 5 and 35 °C using a gas-stripping technique. The following equation was obtained for dimensionless Henry’s law constant ( H′) versus temperature ( T, K): ln H ′ = - 3982 ( T , K ) - 1 + 1 . 01 Temperature-dependent octanol–air partition coefficients ( K OA) and supercooled liquid vapor pressures ( P L, Pa) of carbazole were also determined using the GC retention time method. The temperature dependence of K OA and P L were explained by the following: log K OA = 4076 / ( T , K ) - 5 . 65 log P L ( Pa ) = - 3948 ( T , K ) - 1 + 11 . 84 The gas and particle-phase carbazole concentrations measured previously in Chicago, IL in 1995 was used for gas/particle partitioning modeling. Octanol based absorptive partitioning model consistently underpredicted the gas/particle partition coefficients ( K p) for all sampling periods. However, overall there was a good agreement between the measured K p and soot-based model predictions.