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Semimicro Determination of Sulfate in Water Extracts of Soils
Author(s) -
Nelson R. E.
Publication year - 1970
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1970.03615995003400020044x
Subject(s) - sulfate , chemistry , leaching (pedology) , acetone , soil water , titration , ethanol , precipitation , environmental chemistry , chromatography , inorganic chemistry , organic chemistry , geology , soil science , physics , meteorology
Sulfate in water extracts of soils is precipitated in 2:1 acetone‐water solution by adding excess Ca(NO 3 ) 2 and HNO 3 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.