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Among C 2 –C 9 dicarboxylic acids (DCAs), succinic acid (C 4 DCA) exhibits the lowest photooxidation rate, while oxalic acid has the highest photooxidation rate in a liquid-phase reaction system. Twenty-seven identified intermediates are classified into six classes: secondary DCAs, oxo-DCAs, methyl-DCAs, hydroxy-DCAs, hydroxy-monocarboxylic acids (hydroxy-MCAs), and oxo-MCAs...
In this paper, the first of a two-part series, effects of chloride, sulfate, and nitrate ions and pH on photooxidation of azelaic acid were investigated in an aqueous system. Nitrate ions play the major role in accelerating photooxidation of azelaic acid by increasing OH concentration, while chloride ions consume OH concentration and retard photooxidation rates. In inorganic mixtures, a nitrate-to-chloride...
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