ASTM D1252-06(2020)

Standard Test Methods for Chemical Oxygen Demand (Dichromate Oxygen Demand) of Water

SIGNIFICANCE AND USE
5.1 These test methods are used to chemically determine the maximum quantity of oxygen that could be consumed by biological or natural chemical processes due to impurities in water. Typically this measurement is used to monitor and control oxygen-consuming pollutants, both inorganic and organic, in domestic and industrial wastewaters.  
5.2 The relationship of COD to other water quality parameters such as TOC and TOD is described in the literature.3
SCOPE
1.1 These test methods cover the determination of the quantity of oxygen that certain impurities in water will consume, based on the reduction of a dichromate solution under specified conditions. The following test methods are included:    
Test Method A — Macro COD by Reflux Digestion and Titration  
Test Method B — Micro COD by Sealed Digestion and Spectrometry  
1.2 These test methods are limited by the reagents employed to a maximum chemical oxygen demand (COD) of 800 mg/L. Samples with higher COD concentrations may be processed by appropriate dilution of the sample. Modified procedures in each test method (Section 15 for Test Method A, and Section 24 for Test Method B) may be used for waters of low COD content (  
1.3 As a general rule, COD results are not accurate if the sample contains more than 1000 mg/L Cl−. Consequently, these test methods should not be applied to samples such as seawaters and brines unless the samples are pretreated as described in Appendix X1.  
1.4 This test method was used successfully on a standard made up in reagent water. It is the user’s responsibility to ensure the validity of these test methods for waters of untested matrices.  
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.6 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 8, 15.6, and 24.5.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Dec-2019
• 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)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D1252 − 06 (Reapproved 2020)
Standard Test Methods for
Chemical Oxygen Demand (Dichromate Oxygen Demand) of
1
Water
This standard is issued under the fixed designation D1252; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 1.7 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 These test methods cover the determination of the
ization established in the Decision on Principles for the
quantity of oxygen that certain impurities in water will
Development of International Standards, Guides and Recom-
consume, based on the reduction of a dichromate solution
mendations issued by the World Trade Organization Technical
under specified conditions. The following test methods are
Barriers to Trade (TBT) Committee.
included:
Test Method A — Macro COD by Reflux Digestion and Titration
2. Referenced Documents
Test MethodB—Micro COD by Sealed Digestion and Spectrometry
2
1.2 Thesetestmethodsarelimitedbythereagentsemployed
2.1 ASTM Standards:
to a maximum chemical oxygen demand (COD) of 800 mg/L. D1129Terminology Relating to Water
SampleswithhigherCODconcentrationsmaybeprocessedby
D1193Specification for Reagent Water
appropriate dilution of the sample. Modified procedures in D2777Practice for Determination of Precision and Bias of
each test method (Section 15 for Test Method A, and Section
Applicable Test Methods of Committee D19 on Water
24 for Test Method B) may be used for waters of low COD
D3223Test Method for Total Mercury in Water
content (<50 mg/L).
D3370Practices for Sampling Water from Flowing Process
Streams
1.3 As a general rule, COD results are not accurate if the
−
D5847Practice for Writing Quality Control Specifications
samplecontainsmorethan1000mg/LCl .Consequently,these
for Standard Test Methods for Water Analysis
test methods should not be applied to samples such as
D5905Practice for the Preparation of SubstituteWastewater
seawaters and brines unless the samples are pretreated as
E60Practice for Analysis of Metals, Ores, and Related
described in Appendix X1.
Materials by Spectrophotometry
1.4 This test method was used successfully on a standard
E275PracticeforDescribingandMeasuringPerformanceof
made up in reagent water. It is the user’s responsibility to
Ultraviolet and Visible Spectrophotometers
ensure the validity of these test methods for waters of untested
matrices.
3. Terminology
1.5 The values stated in SI units are to be regarded as
3.1 Definitions:
standard. No other units of measurement are included in this
3.1.1 For definitions of terms used in this standard, refer to
standard.
Terminology D1129.
1.6 This standard does not purport to address all of the
3.2 Definitions of Terms Specific to This Standard—The
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- term “oxygen demand” (COD) in these test methods is defined
in accordance with Terminology D1129 as follows:
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
3.2.1 oxygen demand, n—the amount of oxygen required
For specific hazard statements, see Section 8, 15.6, and 24.5.
underspecifiedtestconditionsfortheoxidationofwaterborne
organic and inorganic matter.
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These test methods are under the jurisdiction of ASTM Committee D19 on
Water and are the direct responsibility of Subcommittee D19.06 on Methods for
2
Analysis for Organic Substances in Water. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Jan. 1, 2020. Published January 2020. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
ɛ1
approved in 1953. Last previous edition approved in 2012 as D1252–06 (2012) . Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/D1252-06R20. the ASTM website.
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D1252 − 06 (2020)
TABLE 1 Test Method A, Recovery of Theoretical COD for
4. Summary of Test Methods
Various Organic Material
4.1 Most organic and oxidizable inorganic substances pres-
Reactivity, Percent of Theoretical
ent in water are oxidized
...