ASTM D6697-01

Standard Test Method for Determination for Chemical Oxygen Demand (Manganese III Oxygen Demand) of Water (Withdrawn 2010)

SIGNIFICANCE AND USE
This and other COD test methods are used to chemically determine the quantity of oxygen that certain impurities in water will consume. Typically this measurement is used to monitor and control oxygen-consuming pollutants, both inorganic and organic, in domestic and industrial wastewater applications.
For samples from a specific source, COD can be related empirically to BOD, organic carbon, or organic matter. The COD value is useful for monitoring and process control after this correlation has been established.
SCOPE
1.1 This test method covers the colorimetric determination of the quantity of oxygen that certain impurities in water will consume, based on the reduction of a manganese III solution under specified conditions. This standard method does not use characteristic heavy metal reagents, thus eliminating environmental and disposal concerns apparent in other methods.
1.2 This test method determines chemical oxygen demand colorimetrically using manganese III to obtain a visible color intensity inversely proportional to the chemical oxygen demand of the sample. Analytical test kits conforming to these methods are available commercially in ranges from 80 to 1,000 mg/L (ppm) chemical oxygen demand. It is the user's responsibility to ensure the validity of these test methods for their specific samples and matrices.
1.3 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. For specific hazard statements, see Sections 9 and 12.
WITHDRAWN RATIONALE
This test method covers the colorimetric determination of the quantity of oxygen that certain impurities in water will consume, based on the reduction of a manganese III solution under specified conditions. This standard method does not use characteristic heavy metal reagents, thus eliminating environmental and disposal concerns apparent in other methods.
Formerly under the jurisdiction of Committee D19 on Water, this test method was withdrawn in February 2010 in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

General Information

• Status: Withdrawn
• Publication Date: 09-Jul-2001
• Withdrawal Date: 31-Jan-2010
• ICS: 13.060.50 - Examination of water for chemical substances
• Technical Committee: D19 - Water
• Drafting Committee: D19.06 - Methods for Analysis for Organic Substances in Water

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:D6697–01
Standard Test Method for
1
Determination for Chemical Oxygen Demand (Manganese III
2
Oxygen Demand) of Water
This standard is issued under the fixed designation D6697; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope D5905 Practice for the Preparation of Substitute Wastewa-
ter
1.1 This test method covers the colorimetric determination
E60 Practice for Analysis of Metals, Ores, and Related
of the quantity of oxygen that certain impurities in water will
Materials by Molecular Absorption Spectrometry
consume, based on the reduction of a manganese III solution
E275 Practice for Describing and Measuring Performance
under specified conditions. This standard method does not use
of Ultraviolet and Visible Spectrophotometers
characteristic heavy metal reagents, thus eliminating environ-
mental and disposal concerns apparent in other methods.
3. Terminology
1.2 This test method determines chemical oxygen demand
3.1 Definitions:
colorimetrically using manganese III to obtain a visible color
3.1.1 For definitions of terms used in this test method refer
intensity inversely proportional to the chemical oxygen de-
to Definitions D1129.
mand of the sample. Analytical test kits conforming to these
3.2 Definitions of Terms Specific to This Standard:
methodsareavailablecommerciallyinrangesfrom80to1,000
3.2.1 oxygen demand, n—the amount of oxygen required,
mg/L (ppm) chemical oxygen demand. It is the user’s respon-
under specified test conditions for the oxidation of water-borne
sibility to ensure the validity of these test methods for their
organic and inorganic matter.
specific samples and matrices.
3.2.2 MSDS, n—Material Safety Data Sheet; should be
1.3 This standard does not purport to address all of the
included with all reagents.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Summary of Test Method
priate safety and health practices and determine the applica-
4.1 Thistestmethodconsistsofoxidationofsampleorganic
bility of regulatory limitations prior to use. For specific hazard
matter by manganese III, a strong, chemical oxidant, and
statements, see Sections 9 and 12.
subsequent measure of the organic matter oxygen equivalent.
Manganese III changes quantitatively from purple towards
2. Referenced Documents
3 colorless when it reacts with organic matter. The reaction
2.1 ASTM Standards:
mechanism of the method is illustrated by the following
D596 Guide for Reporting Results of Analysis of Water
equation, using potassium hydrogen phthalate as an example:
D1129 Terminology Relating to Water
KC H O 1 7.5 O →8CO 12H O 1 KOH
D1193 Specification for Reagent Water
8 5 4 2 2 2
D2777 Practice for Determination of Precision and Bias of
4.1.1 Manganese III typically oxidizes about 80 % of the
Applicable Test Methods of Committee D19 on Water
organic compounds. Studies have shown that the reactions are
D5789 Practice for Writing Quality Control Specifications
reproducible, and test results can be correlated empirically to
4
for Standard Test Methods for Organic Constituents
biochemical oxygen demand (BOD) values and hexavalent
chromium COD tests. None of the above oxygen demand tests
1 provide 100 % oxidation of all organic compounds.
Trivalent Manganese.
2
4.2 Calibration is based on the oxidation of potassium acid
This test method is under the jurisdiction of ASTM Committee D19 on Water
andisthedirectresponsibilityofSubcommitteeD19.06onMethodsforAnalysisfor
phthalate (KHP), which is adequate for most applications.This
Organic Substances in Water.
calibration may be developed by the user, or the manufacturer
Current edition approved July 10, 2001. Published October 2001. DOI: 10.1520/
may provide a curve that it has developed for its instruments.
D6697-01.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or A different response may be seen in analyzing various waste-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
waters. Special waste streams or classes will require a separate
Standards volume information, refer to the standard’s Document Summary page on
calibration to obtain a direct mg/LCOD reading or to generate
the ASTM website.
4
a correction factor for the precalibrated KHP response. The
Withdrawn. The last approved version of this historical standard is referenced
on www.astm.org.
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