Abstract
Tri- and dibutylphosphate (TBP and DBP) in concentrated uranyl nitrate solution are determined by a method based on the solvent extraction of zirconium-95. The distribution ratio of zirconium-95 between dilute solutions of TBP and DBP in dodecane and 10 M hydrochloric acid and 1 Mnitric acid respectively is measured. There is a logarithmic relationship between the distribution ratio and concentration of TBP and DBP, which enables them to be determined rapidly and with an error of ± 10% over the range 1–100ppm of TBP and 40–600 ppm of DBP. The lower limit is 0.5 ppm for TBP and 10 ppm for DBP.
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