Record Display for the EPA National Library Catalog
RECORD NUMBER: 4 OF 4| Main Title | Photochemistry of Aqueous Iron(III)-Polycarboxylate Complexes: Roles in the Chemistry of Atmospheric and Surface Waters. | |||||||||||
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| 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) | |||||||||||
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| Collation | 8p | |||||||||||
| Abstract | 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. |