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An EDTA Method for the Direct Routine Determination of Calcium and Magnesium in Soils and Plant Tissue¹

ABSTRACT

An EDTA procedure is described for the direct determination of Ca and Mg in soils and plant tissue. These elements are determined in the ammonium acetate leachate of soils and in the 1N HNO₃ solution of the plant ash. Calcium is separated from Mg by precipitating calcium sulfate from ethanol and is determined in the precipitate. Magnesium is determined in the supernatant solution. Manganese may be present in concentrations likely to interfere with the Mg titration, but this interference is easily eliminated. The accuracy and precision of the method are well within the limits required for routine analyses.

¹ Contribution from the U. S. Soils Laboratory, Soil and Water Conservation Research Division, ARS, USDA.

² Research Soil Scientist and Physical Science Technician, respectively. Beltsville, Maryland.

Received for publication October 23, 1961. Accepted for publication December 19, 1961.