Abstract
Abstract The extraction behavior of TcO− 4 and Pd(II) from aqueous HNO3 was studied using dihexyl-N,N-diethylcarbamoylmethylphosphonate. Distribution ratios were studied as a function of contact time; concentration of solute, acid, and extractant; and extraction temperature. Extraction measurements of TcO− 4 were also made using H2SO4 in the aqueous phase. It was found that the extractant dependency for TcO− 4 is third power. Distribution measurements for TcO− 4 as a function of temperature in the range of 0–50°C led to a calculation of the thermodynamic quantity ΔH. A third-power extractant dependency for Pd(II) is suggested but is not strongly corroborated. Interpretation of Pd(II) data was hindered by slow kinetics (approximately 1 h to reach equilibrium and variations in distribution ratios with aqueous Pd(II) concentration.
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