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A novel and really simple method for extractive photometric determination of uranium is achievable by Azur II dye with accurate and sensitive results. This has been possible through a basic dye (Azur II) that reacts firstly with a suitable ligand (benzoate) to form a triple complex. The latter is then extracted in a suitable organic solvent (Trioctylamine). Optimisation of the formed U-benzoate-Azur II complex was performed by studying several parameters such as suitable pH, dye concentration, duration time of the formed complex, solvent concentration, shaking time and U concentration (calibration curve). This reagent is extremely sensitive to uranium, with a molar absorption potential of 0.654 × 10 4  L. M −1  cm −1  at pH 4 at 688 nm. Absorbance measurements showed as time function that the coloured complex is stable up to 20 min. This system allows uranium content to be calculated with a detection limit (LOD) of 0.15 µg L −1 , and precision expressed as relative standard deviation (RSD) of 0.368%. The tolerance limits had been calculated for several metal ions. Accuracy was confirmed by U (VI) determination in the standard reference materials. This new spectrophotometric method was applied for the determination of U(VI) in some cataclastic rock samples with accurate results.

A novel method for extractive spectrophotometric determination of uranium by Azur II dye in some geological samples