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An Improved Method for Extracting Organic Matter from Soil¹

ABSTRACT

A procedure is described which reduces the possibility of chemical alteration of soil organic matter during extraction, and which permits recovery of most of the solubilized organic matter as an acid-insoluble material low in ash. The essential features of the method are: (i) destruction of hydrated silicate minerals by pretreatment of the soil with 0.3N HF, (ii) recovery of organic matter by extraction first with 0.02M Na₄P₂O₇ and then with 0.03N NaOH, and (iii) removal of inorganic contaminants by dialysis against 0.3N HF.

¹ Contribution from the Department of Agronomy, University of Illinois, Urbana.

² Former Research Assistant and Professor, respectively. The senior author is now Research Assistant, Michigan State University, East Lansing.

Received for publication June 16, 1967. Accepted for publication September 19, 1967.