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An Indirect Method for the Measurement of Sulfate by Barium Absorption Spectrophotometry¹

ABSTRACT

A method was developed to analyze for aqueous-solution sulfate by precipitation by barium and measuring the remaining barium by atomic absorption spectrophotometry. The method compared favorably with a turbidimetric and a gravimetric method. Sensitivity was 1.5 ppm S/1% absorption. The method could be used without dilutions for solutions containing up to 150 ppm S.

¹ Journal paper no. 3690. The Pennsylvania State University Agr. Exp. Sta., University Park, Penn. Contribution from the School of Forest Resources.

² Assistant Professor of Forestry and Instructor of Forestry, respectively, School of Forest Resources.

Received for publication January 30, 1970. Accepted for publication March 23, 1970.