ASTM D1252-00

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

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 ( 50 mg/L).
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.
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.
1.5This 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 Section 8 and Note 3 and Note 9.

General Information

• Status: Historical
• Publication Date: 09-Jun-2000
• 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

Relations

• Replaced By: ASTM D1252-06 - Standard Test Methods for Chemical Oxygen Demand (Dichromate Oxygen Demand) of Water
• Effective Date: 15-Feb-2006
• Referred By: ASTM D3223-17 - Standard Test Method for Total Mercury in Water
• Effective Date: 10-Jun-2000
• Referred By: ASTM D3694-96(2017) - Standard Practices for Preparation of Sample Containers and for Preservation of Organic Constituents
• Effective Date: 10-Jun-2000
• Referred By: ASTM D8084-17 - Standard Test Method for Photoelectrochemical Oxygen Demand of Freshwater Sources for Drinking Water Treatment Plants and Treated Drinking Water
• Effective Date: 10-Jun-2000

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
An American National Standard
Designation:D1252–00
Standard Test Methods for
Chemical Oxygen Demand (Dichromate Oxygen Demand) of
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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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope D 1192 Specification for Equipment for Sampling Water
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and Steam in Closed Conduits
1.1 These test methods cover the determination of the
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D 1193 Specification for Reagent Water
quantity of oxygen that certain impurities in water will
D 3223 Test Method for Total Mercury in Water
consume, based on the reduction of a dichromate solution
D 3370 Practices for Sampling Water from Closed Con-
under specified conditions. The following test methods are
2
duits
included:
D 3856 Guide for Good Laboratory Practices in Laborato-
TestMethodA—MacroCODbyRefluxDigestionandTitration
2
ries Engaged in Sampling and Analysis of Water
D 4210 Practice for Intralaboratory Quality Control Proce-
TestMethodB—MicroCODbySealedDigestionandSpectrometry
2
dures and a Discussion on Reporting Low-Level Data
1.2 Thesetestmethodsarelimitedbythereagentsemployed
D5905 Practice for the Preparation of Substitute Wastewa-
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to a maximum chemical oxygen demand (COD) of 800 mg/L.
ter
SampleswithhigherCODconcentrationsmaybeprocessedby
E 60 Practice for Photometric and Spectrophotometric
3
appropriate dilution of the sample. Modified procedures in
Methods for Chemical Analysis of Metals
eachtestmethod(Section15forTestMethodAandSection24
E 275 Practice for Describing and Measuring Performance
for Test Method B) may be used for waters of low COD
of Ultraviolet, Visible, and Near Infrared Spectrophotom-
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content (< 50 mg/L).
eters
1.3 As a general rule, COD results are not accurate if the
−
3. Terminology
samplecontainsmorethan1000mg/LCl .Consequently,these
test methods should not be applied to samples such as
3.1 Definitions—Fordefinitionsofothertermsusedinthese
seawaters and brines.
test methods, refer to Terminology D1129.
1.4 This test method was used successfully on a standard 3.2 The term “oxygen demand” (COD) in these test meth-
made up in reagent water. It is the user’s responsibility to
ods is defined in accordance with Terminology D1129 as
ensure the validity of these test methods for waters of untested follows:
matrices.
3.2.1 oxygen demand—the amount of oxygen required un-
1.5 This standard does not purport to address all of the der specified test conditions for the oxidation of water borne
safety concerns, if any, associated with its use. It is the
organic and inorganic matter.
responsibility of the user of this standard to establish appro-
4. Summary of Test Methods
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. For specific hazard 4.1 Most organic and oxidizable inorganic substances
statements, see Section 8 and Note 3 and Note 9. present in water are oxidized by a standard potassium dichro-
mate solution in 50% sulfuric acid standard potassium dichro-
2. Referenced Documents
mate solution in 50% (vol/vol) sulfuric acid. The dichromate
2.1 ASTM Standards:
consumed (Test Method A) or tri-valent chromium produced
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D 1129 Terminology Relating to Water (Test Method B) is determined for calculation of the COD
value.
4.2 The oxidation of many otherwise refractory organics is
facilitated by the use of silver sulfate that acts as a catalyst in
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These test methods are under the jurisdiction of ASTM Committee D-19 on
the reaction.
Water and are the direct responsibility of Subcommittee D19.06 on Methods for
Analysis for Organic Substances in Water.
Current edition approved June 10, 2000. Published September 2000. Originally
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published as D1252–53T. Last previous edition D1252–95. Annual Book of ASTM Standards, Vol 03.05.
2 4
Annual Book of ASTM Standards, Vol 11.01. Annual Book of ASTM Standards, Vol 03.06.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D1252–00
4.3 These test methods provide for combining the reagents 5. Significance and Use
and sample in a manner that minimizes the loss of volatile
5.1 Thesetestmethodsareusedtochemicallydeterminethe
organic materials, if present.
maximum quantity of oxygen that could be consumed by
4.4 The oxidation of up to 1000 mg/L of chloride ion is
biological or natural chemical processes due to impurities in
inhibited by the addition of mercuric chloride to form stable
water. Typically
...