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Main Title Photochemistry of Aqueous Iron(III)-Polycarboxylate Complexes: Roles in the Chemistry of Atmospheric and Surface Waters.
Author Faust, B. C. ; Zepp, R. G. ;
CORP Author Environmental Research Lab., Athens, GA. ;Duke Univ., Durham, NC. School of the Environment.
Publisher 1993
Year Published 1993
Report Number EPA/600/J-93/520;
Stock Number PB94-135050
Additional Subjects Photochemical reactions ; Iron ; Atmospheric chemistry ; Water pollution ; Surface waters ; Redox reactions ; Photolysis ; Iron complexes ; Quantum efficiency ; Global aspects ; Carbon dioxide ; Radicals ; Reprints ; Atmospheric waters ; Iron-polycarboxylate complexes ; DOC(Dissolved Organic Carbon)
Library Call Number Additional Info Location Last
NTIS  PB94-135050 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8p
Photochemical redox reactions of Fe(III) complexes of polycarboxylates (e.g., citrate, malonate, oxalate) occur on time scales of minutes in sunlight and are potentially important sources of Fe(II), O2-/HO2, H2O2, and OH in atmospheric water drops and surface waters. Quantum yields for Fe(II) formation, determined from experiments and equilibrium speciation calculations, are (1) 0.28 for Fe(OH) (citrate)-at 436 nm, (2) 0.027 for Fe(malonate)2- at 366 nm, and (3) 1.0 for Fe(oxalate)3 at 436 nm. Competitive reactions of O2 and Fe(III) with the polycarboxylate radicals and/or the carbon-centered radicals derived from decarboxylation, as well as speciation of Fe(II) and Fe(III), affect the experimental quantum yields of Fe(I) formation.