Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. More D The low ionic strength counters the dilution effect on the exchange equilibrium by setting the salt concentration of the solution closer to that expected in the soil solution. The pH values obtained in the solution of calcium chloride are slightly lower than those measured in water due to the release of more aluminum ions which then hydrolyses.
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Active view current version of standard. Other Historical Standards. Work Item s - proposed revisions of this standard. More D 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.
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 2 at the end of the text. No other units of measurement are included in this standard. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
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Standard Test Method for pH of Soils
Active view current version of standard. Other Historical Standards. Work Item s - proposed revisions of this standard. More D
Lab Services: Soil testing
Measurement of the pH of soils in both suspensions of water and a calcium chloride solution are made with either a potentiometer using a pH sensitive electrode system Method A , or pH sensitive paper Method B. The potentiometer is calibrated with buffer solutions of known pH. The pH sensitive paper is a less accurate measurement and should only be used for a rough estimate of the soil pH. The electrode must be used for this measurement unless the pH sensitive paper is specified. Atlanta
Standard Test Method for pH of Soils1 This standard is issued under the fixed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This measurement determines the degree of Corrosion Testing acidity or alkalinity in soil materials suspended in water and a 3. Terminology 0.
ASTM D 4972 - R(2007)