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This article in SSSAJ

  1. Vol. 34 No. 2, p. 343-345
    Received: Oct 24, 1969
    Accepted: Dec 29, 1969

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Semimicro Determination of Sulfate in Water Extracts of Soils1

  1. R. E. Nelson2



Sulfate in water extracts of soils is precipitated in 2:1 acetone-water solution by adding excess Ca(NO3)2 and HNO3 to the acid pH indicated by thymol blue. The precipitate is filtered and washed free of occluded ions by leaching with ethanol. The amount of sulfate is calculated from the Ca content (0.005–0.05 meq) in the precipitate, which is determined by EDTA titration. Since the procedure is simple and rapid, the method is suitable for routine soil analysis.

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