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ASTM D4972-95a

Historical Revision

Standard Test Methods for pH of Soils

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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) at the end of the text.

1.2 The values given in SI units are to be regarded as the standard.

1.3 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.


SDO ASTM: ASTM International
Document Number D4972
Publication Date Jan. 10, 2001
Language en - English
Page Count 3
Revision Level 95a
Supercedes
Committee D18.22
Publish Date Document Id Type View
July 1, 2024 D4972-19R24E01 Revision
May 1, 2019 D4972-19 Revision
July 1, 2018 D4972-18 Revision
Nov. 1, 2013 D4972-13 Revision
Jan. 10, 2001 D4972-95A Revision
Jan. 10, 2001 D4972-01 Revision
Sept. 1, 2007 D4972-01R07 Reaffirmation