Gp. Nikitina et al., FEATURES OF GADOLINIUM AND YTTERBIUM EXTRACTION BY TRIBUTYL-PHOSPHATEFROM CONCENTRATED NITRIC-ACID SOLUTIONS .1. COMPOSITIONS OF EXTRACTEDCOMPLEXES, Radiochemistry, 37(1), 1995, pp. 66-68
Distribution of macroquantity (0.3-1.3 M) of Gd and Yb between neat tr
i-n-butyl phosphate (TBP) and 5-12 M nitric acid solutions has been st
udied. The species extracted by TBP from 7-12 M nitric acid solutions
are rare-earth metal (REM) nitrate trisolvates containing one or sever
al nitric acid molecules.