Radiolysis of ground water: Influence of carbonate and chloride on hydrogen peroxide production
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Small volumes of aqueous solutions have been subjected to α-radiation from a241Am source. The irradiated solution was separated from the bulk solution by a glass filter serving as a diffusion barrier. The H2O2 concentration in the bulk solution was monitored by a chemiluminescence technique and the overall production of oxidizing species (H2O2/O2) in irradiated ground water was studied by measuring the Fe2+-consumption in ground water initially containing 2·10−6 mol dm−3 Fe2+. H2O2 yields calculated using the computer program CHEMSIMUL are in fair agreement with experimental yields for “pure” water (pH 8) and aqueous methanol solutions (pH 5). Experimentally G(H2O2)=1.06±0.1 was obtained in “pure” water. In solutions containing 2·10−3 mol·dm−3 HCO 3 − and in ground water G(H2O2) decreased to 0.69±0.03. A corresponding decrease in G(H2O2) was not found in the calculations. The agreement between measured and calculated Fe2+ consumption is fair when slow oxidative reactions in the bulk solutions are taken into account.
KeywordsH2O2 Hydrogen Peroxide Ground Water Oxidative Reaction Methanol Solution
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