The solubility and behaviour of acid gases in the marine aerosol

Abstract

The following Henry's law constants (KH/mol2kg-2atm-1) for HNO3 and the hydrohalic acids have been evaluated from available partial pressure and other thermodynamic data from 0°-40°C, 1 atm total pressure: HNO3, 40°C-5.85×105; 30°C-1.50×106; 25°C-2.45×106; 20°C-4.04×106; 10°C-1.15×107; 0°C-3.41×107. HF, 40°C-3.2; 30°C-6.6; 25°C-9.61; 20°C-14.0; 10°C-32.0; 0°C-76. HCl, 40°C-4.66×105; 30°C-1.23×106; 25°C-2.04×106; 20°C-3.37×106; 10°C-9.71×106; 0°C-2.95×107. HBr, 40°C-2.5×108; 30°C-7.5×108; 25°C-1.32×109; 20°C-2.37×109; 10°C-8.10×109; 0°C-3.0×1010. HI, 40°C-5.2×108; 30°C-1.5×109; 25°C-2.5×109; 20°C-4.5×109; 10°C-1.5×1010; 0°C-5.0×1010. Simple equilibrium models suggest that HNO3, CH3SO3H and other acids up to 10x less soluble than HCl displace it from marine seasalt aerosols. HF is displaced preferentially to HCl by dissolved acidity at all relative humidities greater than about 80%, and should be entirely depleted in aged marine aerosols. © 1988 Kluwer Academic Publishers.