Absorption of H2S in aqueous alkanolamine solution is of considerable commercial importance. A simple method is presented to determine the equilibrium pressure having very low loading of H2S, with the help of ＇sulfide＇ ion-selective electrode. By this method H2S-DEA and H2S-TEA VLE-data were obtained at different amine concentration and temperatures. A theoretical analysis of equilibrium between H2S and aqueous alkanolamine solution has been reviewed. A semiempirical model with a correlation parameter, beta-factor, is introduced to predict the equilibrium between H2S and alkanolamines.