Citation:

Grundl, T. J. AND D. L. Macalady. ELECTRODE MEASUREMENT OF REDOX POTENTIAL IN ANAEROBIC FERRIC/FERROUS CHLORIDE SYSTEMS. JOURNAL OF CONTAMINANT HYDROLOGY 5(1):97-117, (1989).

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Description:

The behaviour of two inert redox electrodes (Pt and wax-impregnated graphite) was investigated in anaerobic ferrous and ferric chloride solutions in order to establish if these electrodes respond to the Fe³⁺/Fe²⁺ couple in a Nernstian manner. A new method for determining dissolved ferric iron at any point in time was used which permitted the calculation of Eh values that are independent of variations in the solubility of ferric oxyhydroxides. This method is applicable to simple iron solution at pH levels of 4 or less. In solutions of ironic strength greater than 0.005 M, both electrodes yielded measured potentials that correspond to the value calculated by the Nernst equation. In solutions of ionic strength less than 0.005 M, electrode response became non-Nernstian. Low exchange current densities did not appear to be responsible for the non-Nernstian behaviour.

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ELECTRODE MEASUREMENT OF REDOX POTENTIAL IN ANAEROBIC FERRIC/FERROUS CHLORIDE SYSTEMS  

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Record Details:

Record Type:DOCUMENT( JOURNAL/ PEER REVIEWED JOURNAL)

Product Published Date:12/01/1989

Record Last Revised:04/10/2009

OMB Category:Other

Record ID: 128699

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Access Procedures :EPA ONLY

Document IDs:

EPA Number :EPA/600/J-89/386

NTIS Number : 90-246075