The gas solubility of hydrogen sulfide in aqueous solutions of 32.5 wt.% N-methyldiethanolamine (MDEA) and 12.5 wt.% diethanolamine with 4, 6, and 10 wt.% 2-amino-2-methyl-1-propanol, at 313.15, 343.15, and 393.15 K, has been measured, using a volumetric method for the analysis of the liquid phase, over a range of pressure from 2.5 to 1036 kPa. The experimental results of the gas solubility are given as the partial pressure of H2S against its mole ratio a (mol H2S/mol total alkanolamine) and mole fraction of H2S at each temperature studied. Enthalpies of solution of H2S have been derived from the pressure-temperature concentration data. Experimental solubility data obtained in our laboratory for H2S and CO2 are compared, and it is possible to establish that the aqueous solutions of MDEA, DEA, and AMP studied in this work are highly selective towards H2S under the same conditions of pressure and temperature. (C) 2004 Elsevier B.V. All rights reserved.