Oxidation Reduction Potential (ORP)

-Standard Practice for Oxidation-Reduction Potential of Water (ASTM D1498)

Scope:

This practice covers the apparatus and procedure for the electrometric measurement of oxidation-reduction potential (ORP) in water. It does not deal with the manner in which the solutions are prepared, the theoretical interpretation of the oxidation-reduction potential, or the establishment of a standard oxidation-reduction potential for any given system. The practice described has been designed for the routine and process measurement of oxidation-reduction potential.

This is a practice designed to measure the ORP which is defined as the electromotive force between a noble metal electrode and a reference electrode when immersed in a solution. The practice describes the equipment available to make the measurement, the standardization of the equipment and the procedure to measure ORP. The ORP electrodes are inert and measure the ratio of the activities of the oxidized to the reduced species present.

 

Method Data

Method D1498
Hold Time
Preservation
Sample Volume250mL HDPE bottle
Collection MethodGrab sampling
InstrumentationORP electrode
Method RefernceASTM D1498

Analyte List

AnalyteFormulaCAS Number
Oxidation Reduction Potential

* The typical detection limits and analytes are displayed for this particular method. Please contact Specialty Analytical if other analytes or detection limits are required in addition to the 200.8 Analyte List.

Oxidation Reduction Potential (ORP)

-Standard Practice for Oxidation-Reduction Potential of Water (ASTM D1498)

Scope:

Electrometric measurements are made by potentiometric determination of electron activity (or intensity) with an inert indicator electrode and a suitable reference electrode. Ideally, the indicator electrode will serve as either an electron donor or acceptor with respect to electroactive oxidized or reduced chemical species in solution. At redox equilibrium, the potential difference between the ideal indicator electrode and the reference electrode equals the redox potential of the system. However, inert indicator electrodes that behave ideally in all aqueous systems, particularly in natural waters, do not exist. Electrodes made of platinum are most commonly used for Eh measurements. They have limitations,1 as do alternative materials such as gold and graphite.

 

Method Data

Method 2580B
Hold Time
Preservation
Sample Volume250mL HDPE bottle
Collection MethodGrab sampling
InstrumentationORP electrode
Method RefernceSM 2580B

Analyte List

AnalyteFormulaCAS Number
Oxidation Reduction Potential

* The typical detection limits and analytes are displayed for this particular method. Please contact Specialty Analytical if other analytes or detection limits are required in addition to the 200.8 Analyte List.

Oxidation Reduction Potential in Soil (ORP)

Standard Test Method for Measurement of Oxidation-Reduction Potential (ORP) of Soil (ASTM G200)

Scope:

This test method covers a procedure and related test equipment for measuring oxidation-reduction potential (ORP) of soil samples removed from the ground.

Soil ORP, in conjunction with other soil characteristics such as electrical resistivity (see Test Methods G57 and G187), is used to predict corrosion tendencies of buried metallic structures (for example, pipelines and culverts. The ORP of the soil is one of many factors that influence structure service life. Its measurement is used in the design of new buried structures and in the evaluation of existing buried structures.

 

Method Data

Method G200
Hold Time
Preservation
Sample Volume250mL HDPE bottle
Collection MethodGrab sampling
InstrumentationORP electrode
Method RefernceASTM G200

Analyte List

AnalyteFormulaCAS Number
Oxidation Reduction Potential

* The typical detection limits and analytes are displayed for this particular method. Please contact Specialty Analytical if other analytes or detection limits are required in addition to the 200.8 Analyte List.

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