Separation and Determination of Gadolinium in Uranium Samples by Spectrophotometry

摘要

A spectrophotometric method has been developed for the analysis of 10-80 mu g of gadolinium present in uranium samples. The separation of uranium from gadolinium is effected by extracting uranium into 0.2 M tri-n-octyl phosphine oxide (TOPO) in benzene and gadolinium is estimated by spectrophotometry using Arsenazo III as chromogenic reagent at pH 2.0. The absorbance for qadolinium Arsenazo III complex is read at 650 mm. In this method the sample aliquots containing up to 40 mgs of uranium do not interfere and the interference due to iron up to 50 mu g can be suppressed by the addition of 20 mg of hydroxylamine hydrochloride. The overall error variation and precision of the method was found to be within +- 2.0%. (Atomindex citation 14:798144)