Soil samples are air-dried and sieved to 2.0 mm. Between 0.50 and 2.00 grams of soil are shaken with 25.0 mL 0.4M Acetic Acid for 16 hr. The same is done for a range of sample sizes from a pure calcite standard reference material. pH is then determined on a Mettler Toledo Seven-Multi pH meter with an InLab Routine Pro combination electrode, calibrated to pH buffers 4, 7, and 10. %CCE is calculated stoichiametrically based on the standard curve of pH values for treated calcite reference samples.
(Ref. No. 12 - Method References)