Methods for the analysis of Soil, Plant, Water, and Environmental Samples

CALCIUM CARBONATE EQUIVALENT
LIMING MATERIALS

EQUIPMENT

1. pH Meter

2. 50 ml. Burette

3. Hot Plate

REAGENTS

1. 2.0N HCl

2. 0.25N NaOH

PROCEDURE

1. Weigh 1.00 g of sample into a 150 ml. beaker.

2. Add 12 ml. of 2.0N HCl.

3. Add 38 ml. Deionized water.

4. Boil gently for 5 minutes and let cool.

5. Immerse pH combination electrode in the solution.

6. Titrate to pH 8.30 with 0.25N NaOH.

CALCULATION

% Calcium Carbonate Equivalent = [ 24 - ( ml. NaOH X .25) ] X 5

REFERENCE

1. Horwitz, W. (Ed), 1980, Official Methods of Analysis of the Association of Official Analytical Chemists, 16th Edition, Washington, D. C., P 1.