This work presents experimental results on the solubility of CO2 in a new blend of diethanolamine (DEA) and trisodium phosphate (TSP) at temperatures ranging from (303.14 to 333.14) K and partial pressures from (10.133 to 20.265) kPa. Total concentrations of aqueous DEA + TSP blends were taken as (1.0, 1.5, and 2.0) mol.dm(-3). In a particular blend, the mole fraction of TSP was in the range 0.02 to 0.20. The results show that CO2 solubility in a blend with a particular total concentration increases with increasing mole fraction of TSP at fixed temperature and partial pressure of CO2. The solubility of CO2 in the blend decreases with increasing temperature but increases with increasing CO2 partial pressure. The maximum CO2 solubility in DEA + TSP blends was found to be 0.869 (mol of CO2) . (mol of absorbent)(-1) at 313.14 K, a total concentration of 2.0 mol.dm(-3), and a TSP mole fraction of 0.2. The experimental results of the present study are compared with those for other blends available in the literature.