A simple method for the selective and sensitive spectrophotometric determination of uranium(1v) is described. The method is based on the reaction of UtV with thorin and subsequent extraction of the red-orange complex with N-hydroxy-N,N' -diphenylbenzamidine (HDPBA) in benzene as an interfacial complex at pH 2.2. The interfacial complex, dissolved in ethanol, exhibits maximum absorbance at 490 nm with a molar absorptivity of 8.8 X 104 1 mol-1 cm-1. The Sandell's sensitivity of the ternary complex is 2.7 X 10-3 pg cm-2. The system obeys Beer's law up to 2.0 pg ml-1 of UrV. Various analytical parameters were studied to establish the optimum conditions for the determination of UW. The method is selective as none of the common metal ions and anions tested interfere. The detection limit of the method is 0.09 pg ml-1 of U'". The relative standard deviation of the method for ten replicate measurements is 1.5%. The method was successfully applied to the recovery of uranium from standard ores, geological samples and synthetic matrices.
A selective and sensitive spectrophotometric method for the determination of Th(IV) has been based on the reaction with thorin and subsequent extraction of the red-orange coloured complex with N-hydroxy-N,N'-diphenylbenzamidine (HDPBA) in benzene as floated complex at pH 2.2. The complex in ethanol exhibits a maximum absorbance at 495 nm, with a molar absorptivity of 6.0x10(4) l mol(-1) cm(-1), with a Sandell's sensitivity of 3.9x10(-3) microg cm(-2). The method follows Beer's law up to 3.0 microg Th(IV) ml(-1). None of the common cations and anions tested interfere. The detection limit of the method is 0.04 microg Th(IV) ml(-1), the RSD (n=10) is 1.4%. The method has been successfully employed for the determination of thorium in various standard and monazite samples.
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