ASTM D6304-20
(Test Method)Standard Test Method for Determination of Water in Petroleum Products, Lubricating Oils, and Additives by Coulometric Karl Fischer Titration
Standard Test Method for Determination of Water in Petroleum Products, Lubricating Oils, and Additives by Coulometric Karl Fischer Titration
SIGNIFICANCE AND USE
5.1 A knowledge of the water content is important in the manufacturing, purchase, sale, or transfer of petroleum products to help in predicting their quality and performance characteristics.
5.2 The presence of moisture could lead to premature corrosion and wear, an increase in the debris load resulting in diminished lubrication and premature plugging of filters, an impedance in the effect of additives, and undesirable support of deleterious bacterial growth.
SCOPE
1.1 This test method covers the direct determination of entrained water in petroleum products and hydrocarbons using automated instrumentation. This test method also covers the indirect analysis of water thermally removed from samples and swept with dry inert gas into the Karl Fischer titration cell. Mercaptan, sulfide (S– or H2S), sulfur, and other compounds are known to interfere with this test method (see Section 6). The precision statement of this method covers the nominal range of 20 mg/kg to 25 000 mg/kg for Procedure A, 30 mg/kg to 2100 mg/kg for Procedure B, and 20 mg/kg to 360 mg/kg for Procedure C.
1.2 This test method is intended for use with commercially available coulometric Karl Fischer reagents and for the determination of water in additives, lube oils, base oils, automatic transmission fluids, hydrocarbon solvents, and other petroleum products. By proper choice of the sample size, this test method may be used for the determination of water from mg/kg to percent level concentrations.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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.
1.5 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
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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: D6304 − 20
Standard Test Method for
Determination of Water in Petroleum Products, Lubricating
1
Oils, and Additives by Coulometric Karl Fischer Titration
This standard is issued under the fixed designation D6304; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* 2. Referenced Documents
2
1.1 This test method covers the direct determination of 2.1 ASTM Standards:
entrained water in petroleum products and hydrocarbons using D1193 Specification for Reagent Water
automated instrumentation. This test method also covers the D1298 Test Method for Density, Relative Density, or API
indirect analysis of water thermally removed from samples and Gravity of Crude Petroleum and Liquid Petroleum Prod-
swept with dry inert gas into the Karl Fischer titration cell. ucts by Hydrometer Method
–
Mercaptan, sulfide (S or H S), sulfur, and other compounds D4052 Test Method for Density, Relative Density, and API
2
are known to interfere with this test method (see Section 6). Gravity of Liquids by Digital Density Meter
The precision statement of this method covers the nominal D4057 Practice for Manual Sampling of Petroleum and
rangeof20 mg⁄kgto25 000mg/kgforProcedureA,30 mg⁄kg Petroleum Products
to 2100 mg⁄kg for Procedure B, and 20 mg⁄kg to 360 mg⁄kg D4175 Terminology Relating to Petroleum Products, Liquid
for Procedure C. Fuels, and Lubricants
D4177 Practice for Automatic Sampling of Petroleum and
1.2 This test method is intended for use with commercially
Petroleum Products
available coulometric Karl Fischer reagents and for the deter-
D5854 Practice for Mixing and Handling of Liquid Samples
mination of water in additives, lube oils, base oils, automatic
of Petroleum and Petroleum Products
transmission fluids, hydrocarbon solvents, and other petroleum
D6299 Practice for Applying Statistical Quality Assurance
products. By proper choice of the sample size, this test method
and Control Charting Techniques to Evaluate Analytical
may be used for the determination of water from mg/kg to
Measurement System Performance
percent level concentrations.
D6300 Practice for Determination of Precision and Bias
1.3 The values stated in SI units are to be regarded as
Data for Use in Test Methods for Petroleum Products,
standard. No other units of measurement are included in this
Liquid Fuels, and Lubricants
standard.
E203 Test Method for Water Using Volumetric Karl Fischer
1.4 This standard does not purport to address all of the Titration
safety concerns, if any, associated with its use. It is the E1064 Test Method for Water in Organic Liquids by Coulo-
responsibility of the user of this standard to establish appro- metric Karl Fischer Titration
priate safety, health, and environmental practices and deter-
3. Terminology
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor-
3.1 For general terminology, refer to Terminology D4175.
dance with internationally recognized principles on standard-
4. Summary of Test Method
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
4.1 This method uses Karl Fischer titration to determine the
mendations issued by the World Trade Organization Technical
amount of water in a sample. A coulometric apparatus is used
Barriers to Trade (TBT) Committee.
to generate iodine for the Karl Fischer reaction at the anode.
When all the water has been titrated, excess iodine is detected
by an electrometric end point detector and the titration is
1
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
2
Subcommittee D02.06 on Analysis of Liquid Fuels and Lubricants. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Dec. 1, 2020. Published January 2021. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
ɛ1
approved in 1998. Last previous edition approved in 2016 as D6304 – 16 . DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D6304-20. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959.
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: D6304 − 16 D6304 − 20
Standard Test Method for
Determination of Water in Petroleum Products, Lubricating
1
Oils, and Additives by Coulometric Karl Fischer Titration
This standard is issued under the fixed designation D6304; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1
ε NOTE—Reference to a Summary of Changes was removed editorially in September 2016.
1. Scope Scope*
1.1 This test method covers the direct determination of water in the range of 10 mg⁄kg to 25 000 mg⁄kg entrained water in
petroleum products and hydrocarbons using automated instrumentation. This test method also covers the indirect analysis of water
−–
thermally removed from samples and swept with dry inert gas into the Karl Fischer titration cell. Mercaptan, sulfide (S or H S),
2
sulfur, and other compounds are known to interfere with this test method (see Section 56). The precision statement of this method
covers the nominal range of 20 mg ⁄kg to 25 000 mg/kg for Procedure A, 30 mg ⁄kg to 2100 mg ⁄kg for Procedure B, and 20 mg ⁄kg
to 360 mg ⁄kg for Procedure C.
1.2 This test method is intended for use with commercially available coulometric Karl Fischer reagents and for the determination
of water in additives, lube oils, base oils, automatic transmission fluids, hydrocarbon solvents, and other petroleum products. By
proper choice of the sample size, this test method may be used for the determination of water from mg/kg to percent level
concentrations.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.5 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D1193 Specification for Reagent Water
D1298 Test Method for Density, Relative Density, or API Gravity of Crude Petroleum and Liquid Petroleum Products by
Hydrometer Method
1
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.06 on Analysis of Liquid Fuels and Lubricants.
Current edition approved July 1, 2016Dec. 1, 2020. Published July 2016January 2021. Originally approved in 1998. Last previous edition approved in 20072016 as
ɛ1
D6304 – 07D6304 – 16 , which was withdrawn in April 2016 and reinstated in July 2016. DOI: 10.1520/D6304-16. DOI: 10.1520/D6304-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D6304 − 20
D4052 Test Method for Density, Relative Density, and API Gravity of Liquids by Digital Density Meter
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4175 Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
D4177 Practice for Automatic Sampling of Petroleum and Petroleum Products
D5854 Practice for Mixing and Handling of Liquid Samples of Petroleum and Petroleum Products
D6299 Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measure-
ment System Performance
D6300 Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products, Liquid Fuels, and
Lubricants
E203 Test Method for Water Using Volumetric Karl Fischer Titra
...
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