ASTM D7923 - 17ae1

    Standard Test Method for Water in Ethanol and Hydrocarbon Blends by Karl Fischer Titration

    Active Standard ASTM D7923 | Developed by Subcommittee: D02.06

    Book of Standards Volume: 05.05


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    Significance and Use

    5.1 Blends of fuel ethanol and hydrocarbon have a limited solvency for water that is dependent upon temperature and the ratio of ethanol to hydrocarbon. Good handling practices are important during the blending, storage, and transportation of fuel to avoid water contamination. High concentrations of water can cause haze or phase separation in ethanol and hydrocarbon blends and lead to freezing problems at low temperatures. Water has also been associated with corrosion and filter plugging.

    1. Scope

    1.1 This test method covers the determination of water from 0.05 % to 5.0 %  by mass in blends of ethanol, hydrocarbon, and corresponding blends. It is intended for measuring water content of gasoline or other hydrocarbon blendstock, denatured fuel ethanol as cited in Specification D4806, and ethanol fuel blends such as those cited in Specification D5798 and Practice D7794. This test method is not applicable to samples that are phase separated.

    1.1.1 Procedure A—For measurement of water up to 2 % by mass in ethanol and hydrocarbon blends using coulometric Karl Fischer titration. This is the referee method for samples containing up to 2 % water.

    1.1.2 Procedure B—For measurement of water up to 5.4 % by mass in ethanol and hydrocarbon blends using volumetric Karl Fischer titration.

    1.2 This method measures mass percent water and allows for the alternative reporting of volume percent. This test method recommends the use of pyridine-free reagents.

    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. Specific precautionary statements are given in Section 8.

    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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D1152 Specification for Methanol (Methyl Alcohol)

    D1193 Specification for Reagent Water

    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

    D4806 Specification for Denatured Fuel Ethanol for Blending with Gasolines for Use as Automotive Spark-Ignition Engine Fuel

    D5798 Specification for Ethanol Fuel Blends for Flexible-Fuel Automotive Spark-Ignition Engines

    D6299 Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance

    D6708 Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material

    D7794 Practice for Blending Mid-Level Ethanol Fuel Blends for Flexible-Fuel Vehicles with Automotive Spark-Ignition Engines

    E203 Test Method for Water Using Volumetric Karl Fischer Titration

    E1064 Test Method for Water in Organic Liquids by Coulometric Karl Fischer Titration


    ICS Code

    ICS Number Code 75.160.20 (Liquid fuels)

    UNSPSC Code

    UNSPSC Code 15101500(Petroleum and distillates)


    Referencing This Standard
    Link Here
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    DOI: 10.1520/D7923-17AE01

    Citation Format

    ASTM D7923-17ae1, Standard Test Method for Water in Ethanol and Hydrocarbon Blends by Karl Fischer Titration, ASTM International, West Conshohocken, PA, 2017, www.astm.org

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