Solvent Extraction of Inorganic Ions with Tri-n-octyl Phosphine Oxide

Abstract

The extraction behavior of about sixty inorganic ions was studied in the respective systems of tri-n-octyl phosphine oxide** -HCl and -HNO3 for a contribution to the radio chemical separation techniques.TOPO was dissolved in toluene and used as its 5% (w/v) solutions. The dis tribution ratios for each elements were det ermined in the same way as previous works. The acid dependence curves were obtained

Separation of Various Cations by Reversed-Phase Partition Chromatography Using Neutral Organophosphorous Compounds

“…The Rf values for the movement of the lanthanide nitra.tes on HDPMimpregnated paper, Figures 2 and 4 In agreement with partition data (16) a definite singularity is seen a t gadolinium, Figures 2 and 3, and the slightly higher R f for this element is expected by analogy with the sl ghtly lower than average partition coefficient into TBP. No singularity existed for cerium in the T B P extraction data and the unusually low R, values obtained are Table V.…”

“…This was predicted for the extraction of uranium(V1) with T B P a t 4 M nitric acid. It should be noted, however, that Hesford, Jackson, and McKay (16) found that the partition coefficients for the extraction of the lanthanides into 100% T B P increased monotonically with nitric acid concentration. Also the column data of Fidelis and Siekierski (7, 8) indicate that the lanthanide nitrates are held progressively tighter as the nitric acid concentration is increased.…”

“…An increase in R, (decrease in partition coefficient) is not appment in the series zinc, cadmium, and niercury(I1) nor is any decrease in the partition coefficients of the alkali and alkaline earths reported with increasing atomic number (16). Iron is also strongly retained a t higher acid concentrations.…”

“…Recently Ishimori and others (16,17) have compiled the known data on the extraction of the metallic elements into T B P and TOPO solutions. They compared these data with data from Kraus on the adsorption of metal chlorides on anion exchange columns.…”

The Chemistry of Solvent Extraction

“…Survey studies on the extractability of a large number of metal nitrates from nitric acid solution in the range from 1-15 M into tributylphosphate, (77) trioctylphosphine oxide (340,341) and some diphos-phates^7 , 341) have become available during the period under review. Survey studies on the extractability of a large number of metal nitrates from nitric acid solution in the range from 1-15 M into tributylphosphate, (77) trioctylphosphine oxide (340,341) and some diphos-phates^7 , 341) have become available during the period under review.…”