Abstract
The distribution of americium(III) trace concentrations between chloroform and 1 M NaClO 4 has been measured as a function of pH and acetylacetone (HAa) concentration (conc. range 3.0 to 0.01 M in CHCl 3) using the AKUFVE closed flow mixer-centrifugal separator with a newly devised alpha on-line liquid scintillation technique. The dependency of the detector on solution composition and interfering or disturbing physical factors such as quenching compounds, sorption, entrainment, radiation background, etc. is described. At high pH slow kinetics are encountered. Most of these phenomena can be directly observed and corrected for in the AKUFVE run, yielding “clean” distribution curves. From these curves it is concluded that in the aqueous phase, the complexes AmAa 2+, AmAa 2 +, AmAa 3 and AmAa 4 − are formed, and in the organic phase probably AmAa 3 and AmAa 3·HAa; equilibrium constants are calculated.
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