Abstract
Abstract Kinetic studies of the photosensitized formation of hydrogen peroxide and hyperoxide ions in a mixed aqueous solution of eosine, oxygen, and EDTA have been attempted on the basis of a switch-over of the primary processes, i.e., the so-called DD, DR, and DO mechanisms. The rate constants for reactions of E+···E− and E+···O2− intermediates with oxygen and EDTA were obtained. The yield of hydrogen peroxide via the DO-initiated mechanism was enhanced as much as one order of magnitude (≈0.012) by the addition of 0.15 mol dm−3 of sodium borate or sodium carbonate. The maximum yield, 0.08, of hydrogen peroxide was obtained in an aerated aqueous solution of 1.0×10−4 mol dm−3 of eosine, 5.0×10−2 mol dm−3 of EDTA, and 8.8×10−2 mol dm−3 of sodium borate.
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