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An Alkaline Oxidation Method for Determination of Total Sulfur in Soils¹

ABSTRACT

A rapid and precise method of determining total sulfur in soils is described. The soil sample is heated with alkaline sodium hypobromite solution to oxidize soil sulfur compounds to sulfate, and the sulfate thus formed is reduced to hydrogen sulfide by a modified Johnson-Nishita procedure and determined colorimetrically as methylene blue. The method gives quantitative results with pure organic and inorganic sulfur compounds, including amino acids, sulfonic acids, organic sulfates, sulfoxides, thioureas, sulfates, sulfites, sulfides, and elemental sulfur. It gives quantitative recovery of organic and inorganic sulfur added to soils and soil extracts, and its results with soils agree closely with those obtained by other methods proposed for total sulfur analysis of soils.

¹ Journal Paper no. J-6324 of the Iowa Agr. & Home Econ. Exp. Sta., Ames. Project 1070. This work was supported in part by the Sulphur Institute.

² Research Associate and Professor, respectively, Department of Agronomy, Iowa State University, Ames.

Received for publication July 25, 1969. Accepted for publication September 15, 1969.