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Main Title Aquatic Humic Substances as Sources and Sinks of Photochemically Produced Transient Reactants.
Author Hoigne, J. ; Faust, B. C. ; Haag, W. R. ; Zepp, R. G. ;
CORP Author Environmental Research Lab., Athens, GA. Office of Research and Development. ;Eidgenoessische Anstalt fuer Wasserversorgung, Abwasserreinigung und Gewaesserschultz, Duebendorf (Switzerland).
Publisher 1989
Year Published 1989
Report Number EPA/600/D-89/040;
Stock Number PB89-221386
Additional Subjects Surface waters ; Water pollution ; Humic acids ; Photochemical reactions ; Solar radiation ; Aquatic biology ; Nitration ; Free radicals ; Hydrogen peroxide ; Oxygen ; Reaction kinetics ;
Library Call Number Additional Info Location Last
NTIS  PB89-221386 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 31p
Abstract In sunlit surface waters, aquatic humics and nitrate act as sensitizers or precursors for the production of photoreactants such as singlet oxygen, humic-derived peroxy radicals, hydrogen peroxide, and solvated electrons. Lifetimes of the various reactants are controlled by their reactions with aquatic humics, by solvent quenching (singlet oxygen), by reactions with molecular oxygen (solvated electron), or by other processes (peroxy radicals). The steady-state concentration of each transient formed during solar irradiation was determined from the observed disappearance rate of added organic probe compounds. The probe compounds have selective reactivities with the individual transient species of interest. Effects of these photoreactants on the elimination of micropollutants and on chemical transformations of dissolved organic matter are discussed.
Supplementary Notes Prepared in cooperation with Eidgenoessische Anstalt fuer Wasserversorgung, Abwasserreinigung und Gewaesserschultz, Duebendorf (Switzerland).
Category Codes 68D; 99E; 99F
NTIS Prices PC A03/MF A01
Primary Description 600/01
Document Type NT
Cataloging Source NTIS/MT
Control Number 927230257
Origin NTIS
Type CAT