Liquid-Liquid Partition of Americium(III) Chelates with 2-Thenoyltrifluoroacetone, 8-Quinolinol and Cupferron

Abstract

Variation in the partition coefficients of chelating extractants, 2-thenoyltrifluoroacetone(HTTA), 8-quinolinol (HOx) and cupferron (HCup), and of their americium chelates have been studied between a number of inert solvents and dilute perchloric acid solution of ionic strength O.1. Partition behavior of cupferron was investigated by means of spectrophotometry, and its perti- tion coefficients were correlated with solubility parameters of solvents. Distribution ratio of americium was determined by the r-counting rate of Am. The extracted chelates were found to be of the type AmA3, where A is the chelating anion. Partition coefficients (PM) for carbon tetrachloride and stability constants (R8) were obtained as; log PM = 1.10, log R3=12.66 for Am(TTA).; 1.75, 22. O^2- for Am (0x), ; and 80, 9.10 for Am (Cup)The PM values in other solvents were estimated from the readily determinable Pmf 3values. Variations of these Pm values in different solvents were also explained in terms of solubility parameters.
These regular trends of the PM values were similar to those of the partition coefficients of the extractants (PHA). The linear correlations, log Pm, - n log PHA + constant, were established for the solvents examined.