Abstract
Although it is increasingly recognized that photochemical reactions of metal complexes can significantly affect the speciation and geochemical cycling of some metals in natural waters, progress has been slow in determining molar absorptivities and quantum yields of individual complexes of a given metal. Such information is needed in order to differentiate the effects of metal-complex stoichiometry from the effects of ligand structure on the photoreactivity and absorption spectra of metal complexes. Hence, a theoretical foundation is provided here for methods that are developed to determine molar absorptivities and quantum yields of individual complexes of a given metal−ligand system. The procedures quantitatively link measurements of average molar absorptivities and average quantum yields with the equilibrium speciation of the metal (measured or computed).
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