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Test of an Ascorbic Acid Method for Determining Phosphorus in Water and NaHCO 3 Extracts from Soil
Author(s) -
Watanabe F. S.,
Olsen S. R.
Publication year - 1965
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/sssaj1965.03615995002900060025x
Subject(s) - ascorbic acid , reagent , antimony , chemistry , phosphorus , ammonium , chromatography , inorganic chemistry , food science , organic chemistry
Murphy and Riley proposed use of a single reagent for determining P. The method was found to be accurate for determining P in soil extracts. This method is based on reduction of the ammonium molybdiphosphate complex by ascorbic acid in the presence of antimony. The color produced is stable for 24 hours. It is less subject to interfering substances than are methods involving reduction by SnCl 2 .