ASTM D1498-07

Standard Test Method for Oxidation-Reduction Potential of Water

SCOPE
1.1 This test method 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 test method described has been designed for the routine and process measurement of oxidation-reduction potential.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 14-Jun-2007
• ICS: 13.060.60 - Examination of physical properties of water
• Technical Committee: D19 - Water
• Drafting Committee: D19.03 - Sampling Water and Water-Formed Deposits, Analysis of Water for Power Generation and Process Use, On-Line Water Analysis, and Surveillance of Water

Relations

• Replaces: ASTM D1498-00 - Standard Practice for Oxidation-Reduction Potential of Water
• Effective Date: 15-Jun-2007
• Replaced By: ASTM D1498-08 - Standard Test Method for Oxidation-Reduction Potential of Water
• Effective Date: 01-May-2008
• Referred By: ASTM D5744-18 - Standard Test Method for Laboratory Weathering of Solid Materials Using a Humidity Cell
• Effective Date: 15-Jun-2007
• Referred By: ASTM D7100-11(2020) - Standard Test Method for Hydraulic Conductivity Compatibility Testing of Soils with Aqueous Solutions
• Effective Date: 15-Jun-2007
• Referred By: ASTM G200-20 - Standard Test Method for Measurement of Oxidation-Reduction Potential (ORP) of Soil
• Effective Date: 15-Jun-2007
• Referred By: ASTM D7294-13(2021) - Standard Guide for Collecting Treatment Process Design Data at a Contaminated Site—A Site Contaminated with Chemicals of Interest
• Effective Date: 15-Jun-2007
• Referred By: ASTM E1943-98(2015) - Standard Guide for Remediation of Ground Water by Natural Attenuation at Petroleum Release Sites
• Effective Date: 15-Jun-2007
• Referred By: ASTM E3163-18 - Standard Guide for Selection and Application of Analytical Methods and Procedures Used during Sediment Corrective Action
• Effective Date: 15-Jun-2007

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D 1498–07
Standard Test Method for
1
Oxidation-Reduction Potential of Water
This standard is issued under the fixed designation D 1498; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope
where:
E = ORP,
1.1 This test method covers the apparatus and procedure for
m
o
E = constant that depends on the choice of
theelectrometricmeasurementofoxidation-reductionpotential
reference electrodes,
(ORP) in water. It does not deal with the manner in which the
F = Faraday constant,
solutions are prepared, the theoretical interpretation of the
R = gas constant,
oxidation-reduction potential, or the establishment of a stan-
T = absolute temperature, °C + 273.15,
dard oxidation-reduction potential for any given system. The
n = number of electrons involved in process
test method described has been designed for the routine and
reaction, and
process measurement of oxidation-reduction potential.
A and A = activities of the reactants in the process.
ox red
1.2 This standard does not purport to address all of the
3.2 For definitions of other items used in this test method,
safety concerns, if any, associated with its use. It is the
refer to Terminology D 1129.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Summary of Test Method
bility of regulatory limitations prior to use.
4.1 This is a test method designed to measure the ORP
which is defined as the electromotive force between a noble
2. Referenced Documents
metal electrode and a reference electrode when immersed in a
2
2.1 ASTM Standards:
solution. The test method describes the equipment available to
D 1129 Terminology Relating to Water
make the measurement, the standardization of the equipment
D 1193 Specification for Reagent Water
and the procedure to measure ORP. The ORP electrodes are
D 2777 Practice for Determination of Precision and Bias of
inert and measure the ratio of the activities of the oxidized to
Applicable Test Methods of Committee D19 on Water
the reduced species present.
D 3370 Practices for SamplingWater from Closed Conduits
5. Significance and Use
3. Terminology
5.1 Various applications include monitoring the
3.1 Definitions of Terms Specific to This Standard:
chlordination/dechlorination process of water, recgonition of
3.1.1 oxidation-reduction potential—the electromotive
oxidants/reductants present in wastewater, monitoring the
force, E , developed between a noble metal electrode and a
m
cyclechemistryinpowerplants,andcontrollingtheprocessing
standard reference electrode. This oxidation-reduction poten-
of cyanide and chrome waste in metal plating baths.
tial (ORP) is related to the solution composition by:
5.2 ThemeasurementofORPhasbeenfoundtobeusefulin
RT
o the evaluation of soils, for evaluating treatment design data at
E 5 E 1 2.3 log@A / A #
m ox red
nF
sites contaminated with certain chemicals, and in evaluating
solid wastes.
1
6. Interferences
This test method is under the jurisdiction of ASTM Committee D19 on Water
and is the direct responsibility of Subcommittee D19.03 on Sampling Water and
6.1 The ORP electrodes reliably measure ORP in nearly all
Water-Formed Deposits, Analysis of Water for Power Generation and Process Use,
aqueous solutions and in general are not subject to solution
On-Line Water Analysis, and Surveillance of Water.
interference from color, turbidity, colloidal matter, and sus-
Current edition approved June 15, 2007. Published July 2007. Originally
approved in 1957. Last previous approved in 2000 as D 1498 – 00.
pended matter.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.2 The ORP of an aqueous solution is sensitive to change
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
in temperature of the solution, but temperature correction is
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. rarely done due to its minimal effect and complex reactions.
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D 1498–07
TABLE 1 National Institute of Standards and Technology (NIST)
Temperature corrections are usually applied only when it is
Materials for Reference Buffer Solutions
desired to relate the ORP to the activity of an ion in the
NIST Standard
solutions.
Sample Buffer Salt Drying Procedure
6.3 The ORP of an aqueous solution is almost always
A
Designation
sensitive to pH variations even to reactions that do n
...