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Comparison of Some Methods for Determination of Total Sulfur in Soils¹

ABSTRACT

A comparison of five methods of determining total sulfur in soils showed that the acid oxidation method of Arkley and the alkaline oxidation method of Tabatabai and Bremner gave almost identical results and were more precise than other methods studied. The results obtained by use of X-ray fluorescence spectrography for determination of total sulfur in soils were, on average, slightly higher than those obtained by the Arkley or Tabatabai-Bremner method, and they indicated that this technique can be used satisfactorily for routine sulfur analysis of mineral soils. Attempts to adapt the Leco Sulfur Analyzer for rapid and precise determination of total sulfur in soils were unsuccessful, but they suggested that this automated instrument might prove useful for sulfur analysis in some types of soil investigations. The data obtained indicate that several methods proposed for total sulfur analysis of soils give satisfactory results.

¹ Journal Paper no. J-6432 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 November 20, 1969. Accepted for publication March 5, 1970.