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Time-Resolved Laser-induced Fluorescence spectroscopy (TRLFS) is used to study the properties of excited UO

The effect of an added electrolyte on the kinetics of fluorescence quenching of the uranyl ion by chloride anion is investigated. Various electrolytes have been used up to a maximum concentration of 9 mol dm À3 . The description of the experimental results is examined using theoretical results of previous work and a new expression derived in this paper. The ability of two mechanisms to interpret the data is analysed. The results point to a diffusion-influenced process mainly controlled by a fast chemical reaction occurring between solventseparated species.