Mechanism for photochemical reaction of organically complexed iron

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The aim of this study was to develop chemical reaction model of organically complexed iron in natural water under solar radiation. At first, the reaction of complex composed of model organic matter and Fe(II) was observed, and rate constants of complexation and dissociation were estimated. Then, the changes of organic matter by radiation were examined. Photolysis of aromatic-like moiety with the higher excitation wavelength was especially high; i.e., it decreased by 50% in 12 hours radiation. On the other hand, protein-like moiety increased by 20%. However, the rate constant of complexation did not show significant change. Although aromatic and humic-like moieties are considered to be related to the complexation with iron, it was indicated that their ability for iron complexation would not change significantly even after partial photolysis.