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RECORD NUMBER: 31 OF 391

OLS Field Name OLS Field Data
Main Title Characterization of the Reducing Properties of Anaerobic Sediment Slurries Using Redox Indicators.
Author Tratnyek, P. G. ; Wolfe., N. L. ;
CORP Author Eidgenoessische Anstalt fuer Wasserversorgung, Abwasserreinigung und Gewaesserschultz, Duebendorf (Switzerland).;Environmental Research Lab., Athens, GA.
Publisher c1990
Year Published 1990
Report Number EPA/600/J-90/063;
Stock Number PB90-245614
Additional Subjects Anaerobic processes ; Oxidation reduction reactions ; Sediments ; Organic compounds ; Oxidizers ; Biochemistry ; Reaction kinetics ; Water pollution ; Electron transfer ; Reducing agents ; Thermodynamics ; Microorganisms ; Colorimetric analysis ; Electrode potentials ; Chemical reaction mechanisms ; Sediment-water interfaces
Holdings
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Status
NTIS  PB90-245614 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 12/03/1990
Collation 9p
Abstract
The reduction of six redox indicators in anaerobic sediment slurries was studied by observing the disappearance of the color of the oxidized forms. The reaction kinetics were first-order in concentration of the oxidized form of the indicator and the reducing agents were sediment associated. The rate of indicator reduction reflects the standard potential of the indicator couple, the structure of the indicator moiety reduced, and the potential and capacity of reducing agents in the sediment slurry. The relative reduction rates of the indicators suggest that anaerobic sediment systems contain concentrations of mild reducing agents that are available to react rapidly with substrates that are easily reduced. However, more refractory substrates require strong reducing agents that are gradually produced, probably as a result of microbial metabolism.