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Deniges' method for determination of phosphate, with special reference to soil solutions and extracts
Author(s) -
Yuen S. H.,
Pollard A. G.
Publication year - 1955
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740060408
Subject(s) - arsenate , ferric , chemistry , phosphate , chloride , ammonium molybdate , molybdate , inorganic chemistry , arsenic , ferric iron , silicate , environmental chemistry , nuclear chemistry , ferrous , organic chemistry , zinc
A modified molybdenum‐blue method is described, with stannous chloride as the reducing agent, for determining phosphate in soil solutions and soil extracts; ferric iron in amounts up to 15 p.p.m. had no ill effect. The influence of varying concentrations of sulphuric acid, ammonium molybdate and stannous chloride on the formation of phosphomolybdenum‐blue complex and the interference due to silicate, arsenate and ferric iron were examined. A study of the effects of various ions showed that ions commonly occurring in soil solutions and some soil extracts did not affect the accuracy of direct determinations of phosphate, but arsenate should be absent from the test.