Chapter A6. Section 6.5. Reduction-Oxidation Potential (Electrode Method)

Nordstrom, Darrell Kirk; Wilde, Franceska D.

Abstract:

Reduction-oxidation (redox) potential--also referred to as Eh--is a measure of the equilibrium potential, relative to the standard hydrogen electrode, developed at the interface between a noble metal electrode and an aqueous solution containing electroactive chemical species. Measurements of Eh are used to evaluate geochemical speciation models, and Eh data can provide insights on the evolution and status of water chemistry in an aqueous system. Nevertheless, the measurement is fraught with inherent interferences and limitations that must be understood and considered to determine applicability to the aqueous system being studied. For this reason, Eh determination is not one of the field parameters routinely measured by the U.S. Geological Survey (USGS). This section of the National Field Manual (NFM) describes the equipment and procedures needed to measure Eh in water using a platinum electrode. Guidance as to the limitations and interpretation of Eh measurement also is included.

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USGS Numbered Series

ProdID:

80048

Citation Author:

Nordstrom, Darrell Kirk; Wilde, Franceska D.

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Geological Survey (U.S.)

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Version 1.2

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ENGLISH

Citation Larger Work Title:

National Field Manual for the Collection of Water-Quality Data. U.S. Geological Survey Techniques of Water-Resources Investigations, Book 9

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Sep

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22 p.

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Geological Survey (U.S.)

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Techniques of Water-Resource Investigation

Citation Series Code:

TWRI

Citation Series Number:

09-A6.5

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Chapter A6. Section 6.5. Reduction-Oxidation Potential (Electrode Method); 2005; TWRI; 09-A6.5; National Field Manual for the Collection of Water-Quality Data. U.S. Geological Survey Techniques of Water-Resources Investigations, Book 9; Nordstrom, Darrell Kirk; Wilde, Franceska D.