SPECTROPHOTOMETRIC DETERMINATION OF URANIUM IN ORE WITH A NEW TYPE THORON AND TPC

Uranium in the ore is separated and converted into U(IV) in HCl andcomplexed with TPC (tetradecyl pyridine chloride) and a new type thoron reagent,2(phosphino-chloro-benzenediazo)-7 (disulfo-naphthyl-diazo)-naphthalene-1, 8 diol-3, 6 disulfonic acid. The molar absorbance at 705 nm is 1.6×10~5, higher thanthat with arsenazo III as the color developing reagent. The relative standarddeviation is±11.4% for ores containing 0.0005% U.