ASTM E70 - 19

    Standard Test Method for pH of Aqueous Solutions With the Glass Electrode

    Active Standard ASTM E70 | Developed by Subcommittee: D16.04

    Book of Standards Volume: 06.04


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    Significance and Use

    4.1 pH is, within the limits described in 1.1, an accurate measurement of the hydrogen ion concentration and thus is widely used for the characterization of aqueous solutions.

    4.2 pH measurement is one of the main process control variables in the chemical industry and has a prominent place in pollution control.

    1. Scope

    1.1 This test method specifies the apparatus and procedures for the electrometric measurement of pH values of aqueous solutions with the glass electrode. It does not deal with the manner in which the solutions are prepared. pH measurements of good precision can be made in aqueous solutions containing high concentrations of electrolytes or water-soluble organic compounds, or both. It should be understood, however, that pH measurements in such solutions are only a semiquantitative indication of hydrogen ion concentration or activity. The measured pH will yield an accurate result for these quantities only when the composition of the medium matches approximately that of the standard reference solutions. In general, this test method will not give an accurate measure of hydrogen ion activity unless the pH lies between 2 and 12 and the concentration of neither electrolytes nor nonelectrolytes exceeds 0.1 mol/L (M).

    1.2 The values stated in SI units are to be regarded as standard. The values in parentheses are for information only.

    1.3 In determining the conformance of the test results using this method to applicable specifications, results shall be rounded off in accordance with the rounding-off method of Practice E29.

    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.


    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

    D1193 Specification for Reagent Water

    D1293 Test Methods for pH of Water

    D5128 Test Method for On-Line pH Measurement of Water of Low Conductivity

    D5464 Test Method for pH Measurement of Water of Low Conductivity

    D6569 Test Method for On-Line Measurement of pH

    D6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

    E1910/E1910M Test Method for Agricultural pH Control Agents, Measurement of pH Change and Buffering Capacity


    ICS Code

    ICS Number Code 71.040.50 (Physicochemical methods of analysis)

    UNSPSC Code

    UNSPSC Code


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/E0070-19

    Citation Format

    ASTM E70-19, Standard Test Method for pH of Aqueous Solutions With the Glass Electrode, ASTM International, West Conshohocken, PA, 2019, www.astm.org

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