Acidic esters of phosphonic acid as selective extractants for metallic cations-selected M(III) tracer studies

Solvent Extraction Separation of Trivalent Americium from Curium and the Lanthanides

“…4). As expected, [37] the K ex values in the HEH[EHP]/H 2 BP18C6 system are lower than those of HDEHP/H 2 BP18C6 system by 1-2 orders of magnitude, reflecting the lower extracting power of the less acidic phosphonic acid extractant HEH [EHP]. For example, the K ex value for Am-HEH[EHP] is 50 times smaller than the corresponding K ex value for Am-HDEHP.…”

A triple tandem columns extraction chromatography method for isolation of highly purified neodymium prior to 143Nd/144Nd and 142Nd/144Nd isotope ratios determinations

“…This is indeed the case for the LN2 resin, an EXC material based on (2ethyl-1-hexyl) phosphonic acid (HEH [EHP]). This compound is not new 45 but as yet it has been little used in geochemistry 46,29 compared to the classical HDEHP. Both ligands belong to the same class of acidic organophosphorus extractants, which have an increasing affinity for lanthanide complexation from the light to the heavy elements, allowing individual lanthanides to be separated from adjacent species.…”

COUNTERCURRENT MUTUAL SEPARATION OF Y$sup 91$ AND Pm$sup 147$ BY SOLVENT EXTRACTION USING PULSE COLUMN

“…Figures (6)(7)(8) (m) number of stages in the scrub section Including the feed case of Pm, and t number of cycles which for the purpose of this comparison will be the same for both components. Prom Table 13, an average value of n is seen to be approximately 1.7 and m =: 2.75.…”