ASTM D4972-13

    Standard Test Method for pH of Soils


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    1. Scope

    1.1 This test method covers the measurement of the pH of soils for uses other than for corrosion testing. Such measurements are used in the agricultural, environmental, and natural resources fields. This measurement determines the degree of acidity or alkalinity in soil materials suspended in water and a 0.01 M calcium chloride solution. Measurements in both liquids are necessary to fully define the soil's pH. This variable is useful in determining the solubility of soil minerals and the mobility of ions in the soil and assessing the viability of the soil-plant environment. A more detailed discussion of the usefulness of this parameter is not warranted here; however, it can be found in many discussions of the subject. A few such discussions are given as Refs (1-6)2 at the end of the text.

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

    1.3 All measured and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.

    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 and health practices and determine the applicability of regulatory limitations prior to use.


    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

    C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials

    D653 Terminology Relating to Soil, Rock, and Contained Fluids

    D1193 Specification for Reagent Water

    D2487 Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)

    D2488 Practice for Description and Identification of Soils (Visual-Manual Procedures)

    D3740 Practice for Minimum Requirements for Agencies Engaged in Testing and/or Inspection of Soil and Rock as Used in Engineering Design and Construction

    D4220/D4220M Practices for Preserving and Transporting Soil Samples

    D4753 Guide for Evaluating, Selecting, and Specifying Balances and Standard Masses for Use in Soil, Rock, and Construction Materials Testing

    D6026 Practice for Using Significant Digits in Geotechnical Data

    D6913 Test Methods for Particle-Size Distribution (Gradation) of Soils Using Sieve Analysis

    G51 Test Method for Measuring pH of Soil for Use in Corrosion Testing


    ICS Code

    ICS Number Code 13.080.10 (Chemical characteristics of soil)

    UNSPSC Code

    UNSPSC Code 11111501(Soil)


    Referencing This Standard
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    DOI: 10.1520/D4972-13

    Citation Format

    ASTM D4972-13, Standard Test Method for pH of Soils, ASTM International, West Conshohocken, PA, 2013, www.astm.org

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