An improved laser-induced fluorimetry for assay of Uranium in Urine

A method for analysis of trace uranium in urine sample was studied using a time-resolved N2-laser-induced fluorimetry. The Fluran solution was found to be efficient to mask the chloride ions which are known to quench uranium fluorescence in the fluorimetric assay of uranium in urine. This improved method made the sample preparation much simpler than other conventional ones. The fluorescence intensities at 1 % urine mixture with 10 % Fluran aqueous solution showed good linearities in the concentration range of 10 - 500 ppb (before dilution). (Author)