Abstract
The rates of reaction of photogenerated hydroperoxy and hydroxyl radicals on the photostability of aqueous solutions of dequalinium chloride irradiated with simulated sunlight at 38 ± 1°C have been investigated, with and without the addition of amaranth and quinoline yellow. These reactions follow second-order kinetics and the dyes tested markedly increase the rate constants of the reactions. Hydroperoxy radicals react with hydroxyl radicals preferentially to the dequalinium chloride resulting in lower reaction rate constants for the latter. Acetaldehyde was used as a scavenger of hydroperoxy radicals.
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