Determination of Volatilization Coefficients of Trihalomethanes from Waters

The volatilization rates of trihalomethanes (CHCl3, CHBrCl2, CHBr2Cl, and CHBr3) were measured under various mixing conditions concurrently with those of oxygen and water. The volatilization coefficients of trihalomethanes were determined from their volatilization rates as the ratios of mass-transfer coefficients in respective liquid and gas phases between trihalomethanes and oxygen or water by new and conventional methods. The new method was indicated to be effective for the determination of the volatilization coefficient of a chemical with dimensionless Henry's constant lower than about 0.1. The volatilization coefficients of trihalomethanes obtained can be applied for estimating their volatilization rates under the conditions in which either the water-or gas-film resistances dominate or both film resistances are significant.