Analysis of gases dissolved in a concentrated aqueous solution of sodium trifluoroacetate

Abstract

Systems composed of water and sodium trifluoroacetate cannot be considered to be binary systems; in fact, oxygen and nitrogen are strongly soluble in these solutions, so that the resulting mixture shows reactive properties on organic substances. As a preliminary study, the chemical analysis of gases present in the liquid mixture composed of water and CF₃COONa (mole ratio = 2.92: 1) has been carried out.

The solubility of O₂ and N₂ at 21.5 °C and 711 Torr in an 18.9986 mol kg^–1 aqueous solution of CF₃COONa was measured. The result shows that these gases are strongly trapped in the employed solvent, the solubility being ∼550 times greater than in water.