Separation and preconcentration of actinides from acidic media by extraction chromatography

Alternative TRUEX-Based Pretreatment Processing of INEEL Sodium Bearing Waste

“…Clearly, these results indicate that oxalic acid concentrations greater than 0.1 M are sufficient to suppress zirconium extraction with negligible impact on uranyl or americium extraction and still exhibit more than sufficient TRUEX aihily for PU4+.It should be noted that these results are in keeping with previous studies on the affinity of oxalic acid for +4 ions over +3 ions (Horwit.z 1985 and1993). 1,,,.1,,,,.,,, ,,,1,,,, A series of linke~batch contacts was performed to veri~the results of the individual measurements described above.…”

Tin isotope analysis of cassiterites from Southeastern and Eastern Asia

“…Figure 1 shows the elution profile of the Sn separation procedure with TRU resin, using the mixed standard solution (MIX50) as a starting material. TRU is an extraction chromatographic resin in which the extractant system is octylphenyl-N,N-di-isobutyl carbamoylphosphine oxide (CMPO) dissolved in tri-nbutyl phosphate (Horwitz et al, 1993). The resin has large [‰] δ 124/120 Sn 2SE 2SD partition coefficients for some actinides (e.g., Th, U, Np, Pu) as well as Sn in HCl media, whereas the affinity of Sn to this resin decreases in HNO 3 media.…”

Separation of rare earth elements and strontium from chondritic meteorites by miniaturized extraction chromatography for elemental and isotopic analyses.

“…Thus, the REE separation chemistry proposed by Huff and Huff (1993) cannot be applied to ironrich samples, such as ultramafic rocks and chondritic meteorites. Horwitz et al (1993) concluded that if Fe(III) was reduced to Fe(II) with 0.3M ascorbic acid, its negative effect on sorption of trivalent actinide, americium, becomes negligible. By analogy ascorbic acid will overcome the problem of loss of trivalent REE.…”