Test Method Title
Standard Test Method for pH of Soils.
Reference Number
ASTM D4972
Material
Soil
Test Property
pH
Description of Test
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.
Number of Test Specimens
1
Test Specimen Size
10g dry, passing the #10 sieve
Keywords
corrosion, moisture; swelling soils, pH