Study of kinetic electrolyte effects on a fast reaction in solution: The quenching of fluorescence of uranyl ion up to high electrolyte concentration

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−3. 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 solvent-separated species.