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Determination of Inorganic Phosphorus in Oxalate Extracts of Soils
Author(s) -
Owens L. B.,
Nelson D. W.,
Sommers L. E.
Publication year - 1977
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/sssaj1977.03615995004100010041x
Subject(s) - ammonium oxalate , oxalate , ammonium molybdate , molybdate , chemistry , ascorbic acid , inorganic chemistry , molybdenum blue , ammonium , phosphorus , soil water , nuclear chemistry , organic chemistry , food science , environmental science , raw material , soil science
A simple and rapid procedure for the determination of inorganic phosphorus in acid ammonium oxalate extracts of soils was developed by modifying the ascorbic acid‐molybdenum blue colorimetric method. The oxalate interference in the determination of P was overcome by addition of excess ammonium molybdate. A molar ratio of molybdate to oxalate, in the final solution, of 2.51:1 was required in order to eliminate the oxalate interference.