Spectrophotometric determination of uranium with anthranilic acid and rhodamine 6G

The reaction of the uranium-anthranilic acid complex to form an ion-association complex with Rhodamine 6G provides a means for its estimation. The anionic primary complex is suggested to be a mixed-ligand complex of uranium with anthranilic acid and its oxidation products. The method is sensitive (ε{lunate} = 6.25 × 104 1.mole-1.cm-1 at 575 nm) and fairly selective, and obeys Beer's law for 0.04-4.00 ppm of uranium. It has been applied to analysis of monazite sand. © 1980.