Determination of low levels of uranium in solutions obtained by acid attack on phosphate rock.
The uranium present in the leach liquors obtained by attack on phosphate rock with sulphuric acid can be extracted with di(2-ethylhexyl)phosphoric acid and TBP after oxidation of any iron(II), and then stripped at 65 degrees with iron(II) in 8.6M phosphoric acid. The uranium is finally determined with arsenazo III.
Bunus
F T
FT
Institute of Atomic Physics, Bucharest, Romania.