Determination of trace uranium by kinetic spectrophotometry

A novel kinetic spectrophotometric method for the determination of trace uranium was proposed based on the inductive effect of uranium (IV) on redox systems of Cr (VI)-I--starch, and the optimal conditions of determination were established. The calibration curve is linear for U (IV) over the concentration range of 0-1.78μg·ml-1, and the detection limit is 0.024μg·ml-1. The procedure is selective for U (IV), and the interference of most rare metal cations coexisting with uranium are negligible. The method was used to determine the uranium in an iron ore, and the results were satisfactory