ASTM D4928 - 12

    Standard Test Method for Water in Crude Oils by Coulometric Karl Fischer Titration

    Active Standard ASTM D4928 | Developed by Subcommittee: D02.02

    Book of Standards Volume: 05.02


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    Significance and Use

    5.1 The accurate analysis of a crude oil sample to determine the water content is important in the refining, purchase, sale, or transfer of crude oils.

    1. Scope

    1.1 This test method covers the determination of water in the range from 0.02 to 5.00 mass or volume % in crude oils. Mercaptan (RSH) and sulfide (S or H2S) as sulfur are known to interfere with this test method, but at levels of less than 500 μg/g [ppm(m)], the interference from these compounds is insignificant (see Section 6).

    1.2 This test method can be used to determine water in the 0.005 to 0.02 mass % range, but the effects of the mercaptan and sulfide interference at these levels has not been determined. For the range 0.005 to 0.02 mass %, there is no precision or bias statement.

    1.3 This test method is intended for use with standard commercially available coulometric Karl Fischer reagent.

    1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.5 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific warning statements, see Section 8.


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

    API Standards

    MPMSChapter8.1 Practice for Manual Sampling of Petroleum and Petroleum Products (ASTM Practice )

    MPMSChapter8.2 Practice for Automatic Sampling of Petroleum and Petroleum Products (ASTM Practice )

    MPMSChapter8.3 Practice for Mixing and Handling of Liquid Samples of Petroleum and Petroleum Products (ASTM Practice )

    ASTM Standards

    D1193 Specification for Reagent Water

    D4057 Practice for Manual Sampling of Petroleum and Petroleum Products (API MPMS Chapter 8.1)

    D4177 Practice for Automatic Sampling of Petroleum and Petroleum Products (API MPMS Chapter 8.2)

    D5854 Practice for Mixing and Handling of Liquid Samples of Petroleum and Petroleum Products (API MPMS Chapter 8.3)

    E203 Test Method for Water Using Volumetric Karl Fischer Titration


    ICS Code

    ICS Number Code 75.040 (Crude petroleum)

    UNSPSC Code

    UNSPSC Code 15101508(Crude oil)


    DOI: 10.1520/D4928-12

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