Extraction behavior of strontium from nitric acid solution with N,N,N′,N′-Tetraisobutyl diglycolamide

Abstract

The extraction behaviors of strontium from nitric acid solution were investigated with N,N,N ' ,N ' -tetraisobutyl diglycolamide (TiBDGA). Effects of acidity, diluents, concentration of extractant and temperature on the distribution ratio of strontium (D Sr ) were examined. The stoichiometry of the extracted molecule was Sr 2+ :TiBDGA of 1:3. The apparent extraction equilibrium concentration constant logK ex was 3.25. The enthalpy change ǻH and entropy change ǻS were -55.6 kJ mol -1 and -124 J mol -1 K -1 , respectively. The extraction is an exothermic process. Through two strip stages, strontium could be stripped effectively by 0.01 M nitric acid solution.