ASTM D7923-19

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: D7923 − 19
Standard Test Method for
Water in Ethanol and Hydrocarbon Blends by Karl Fischer
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Titration
This standard is issued under the fixed designation D7923; 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* 2. Referenced Documents
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2.1 ASTM Standards:
1.1 This test method covers the determination of water in
D1152 Specification for Methanol (Methyl Alcohol)
blends of ethanol, hydrocarbon, and corresponding blends. It is
D1193 Specification for Reagent Water
intended for measuring water content of gasoline or other
D4057 Practice for Manual Sampling of Petroleum and
hydrocarbon blendstock, denatured fuel ethanol as cited in
Petroleum Products
Specification D4806, and ethanol fuel blends such as those
D4175 Terminology Relating to Petroleum Products, Liquid
cited in Specification D5798 and Practice D7794. This test
Fuels, and Lubricants
method is not applicable to samples that are phase separated.
D4177 Practice for Automatic Sampling of Petroleum and
1.1.1 Procedure A—For measurement of water from
Petroleum Products
0.004 % by mass to 1.63 % by mass in ethanol and hydrocar-
D4806 Specification for Denatured Fuel Ethanol for Blend-
bon using coulometric Karl Fischer titration.This is the referee
ing with Gasolines for Use as Automotive Spark-Ignition
method for samples containing up to 1.63 % water.
Engine Fuel
1.1.2 Procedure B—For measurement of water from 0.02 %
D5798 Specification for Ethanol Fuel Blends for Flexible-
by mass to 5.41 % by mass in ethanol and hydrocarbon using
Fuel Automotive Spark-Ignition Engines
volumetric Karl Fischer titration.
D6299 Practice for Applying Statistical Quality Assurance
and Control Charting Techniques to Evaluate Analytical
1.2 This method measures mass percent water and allows
Measurement System Performance
for the alternative reporting of volume percent. This test
D6708 Practice for StatisticalAssessment and Improvement
method recommends the use of pyridine-free reagents.
of Expected Agreement Between Two Test Methods that
1.3 The values stated in SI units are to be regarded as
Purport to Measure the Same Property of a Material
standard. No other units of measurement are included in this
D7794 Practice for Blending Mid-Level Ethanol Fuel
standard.
BlendsforFlexible-FuelVehicleswithAutomotiveSpark-
Ignition Engines
1.4 This standard does not purport to address all of the
E203 Test Method for Water Using Volumetric Karl Fischer
safety concerns, if any, associated with its use. It is the
Titration
responsibility of the user of this standard to establish appro-
E1064 Test Method for Water in Organic Liquids by Coulo-
priate safety, health, and environmental practices and deter-
metric Karl Fischer Titration
mine the applicability of regulatory limitations prior to use.
Specific precautionary statements are given in Section 8.
3. Terminology
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
3.1 For general terminology, refer to Terminology D4175.
ization established in the Decision on Principles for the
3.2 Definitions:
Development of International Standards, Guides and Recom-
3.2.1 denatured fuel ethanol, n—fuel ethanol made unfit for
mendations issued by the World Trade Organization Technical
beverage use by the addition of denaturants under formula(s)
Barriers to Trade (TBT) Committee.
approved by the applicable regulatory agency to prevent the
imposition of beverage alcohol tax. D4806
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This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
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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 June 1, 2019. Published June 2019. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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approved in 2016. Last previous edition approved in 2017 as D7923 – 17a . DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D7923-19. 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
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D7923 − 19
3.2.2 hydrocarbon, n—a compound composed solely of generator elec
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