Effects of temperature, pH, and ionic strength on the Henry's law constant of triethylamine

The Henry's law constants (K-H) of triethylamine (TEA) in pure water and in 1-octanol were measured for the temperatures pertinent to the lower troposphere (278-298K) using a bubble column system coupled to a Fourier transform infrared spectrometer. The K-H values of TEA in water and 1-octanol at 298K are 5.750.86molL(-1)atm(-1) and 115.625.78molL(-1)atm(-1). The K-H values display strong dependence on temperature, pH, and ionic strength. The characteristic times for TEA to establish an equilibrium between gas and droplet with a size of 5.6 mu m are 33s (298K, pH=5.6); 8.9x10(2)s (278K, pH=5.6); 1.3x10(3)s (298K, pH=4.0); and 3.6x10(4)s (278K, pH=4.0). The evaluation of TEA partitioning between gas phase and condensed phase implies that TEA predominantly resides in rainwater, and TEA loss to organic aerosol is negligible.