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Sulfur Determination in Soil Extracts by an Indirect Atomic Absorption Spectrophotometric Method¹

ABSTRACT

Soil-sulfur in Volcanic-ash derived soils was determined in soil extracts. The sulfur extracted was transformed into sulfate ions and organic matter destroyed by means of a 30% H₂O₂ solution. Sulfate ions were precipitated with a 15% BaCl₂ solution and the precipitate then dissolved in (NH₄)₂ EDTA, and Barium determined by Atomic Absorption Spectrophotometry. Sulfur recovery was ascertained using an internal standard.

¹ Contribution from the Department of Chemistry, Facultad de Química y Farmacia, Universidad de Chile, Santiago, Chile.

² Assistant Professors and Professor of Analytical Chemistry respectively.

Received for publication April 29, 1969. Accepted for publication June 25, 1969.