The Extraction of TcO−4and Pd(II) by Dihexyl-N,N-diethylcarbamoylmethylphosphonate from Nitric Acid
- 1 February 1982
- journal article
- research article
- Published by Taylor & Francis in Separation Science and Technology
- Vol. 17 (2) , 387-405
- https://doi.org/10.1080/01496398208068548
Abstract
The extraction behavior of TcO4- and Pd(II) from aqueous HNO3 was studied with dihexyl-N,N-diethylcarbamoylmetylphosphonate. Distribution ratios were studied as a function of contact time; concentration of solute, acid and extractant, and extraction temperature. Extraction measurements of TcO4- were also made with H2SO4 in the aqueous phase. The extractant dependency for TcO4- was 3rd power. Distribution measurments for TcO4- as a function of temperature in the range of 0-50.degree. C led to a calculation of the thermodynamic quantity .DELTA.H. A 3rd power extractant dependency for Pd(II) was suggested but was not strongly corroborated. Interpretation of Pd(II) data was hindered by slow kinetics (.apprx. 1 h to reach equilibrium) and variations in distribution ratios with aqueous Pd(II) concentration.This publication has 4 references indexed in Scilit:
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