2013 Edition, November 1, 2013
Standard Test Method for pH of Soils
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Description / Abstract:
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