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Determination of Organic Carbon and Carbonates in Soils¹

ABSTRACT

Procedure and apparatus for determining organic and inorganic carbon in soils are described. The digestion acids used differ from those used in common practice in containing no H₂SO₄.

Sulfate interference was shown to prevent complete digestion of carbonates in a system containing H₂SO₄.

The procedure described is accurate for carbonates and for organic compounds as difficult to oxidize as benzoic acid. The time required for one determination of organic carbon is 30 min; that for inorganic carbon is 22 min.

¹ Journal Series no. 262, New Mexico State Agr. Exp. Sta., University Park.

² Associate Professor, Agronomy Dep., and graduate student, Chemistry Dep., respectively.

Received for publication October 3, 1966. Accepted for publication November 22, 1966.