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RELATIONSHIP OF INORGANIC PHOSPHATE FRACTIONS T O MINERALOGICAL CHANGES IN CALCINED CHRISTMAS ISLAND ROCK PHOSPHATE
Author(s) -
ADAMS J. A.,
CAMPBELL A. S.
Publication year - 1973
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1973.tb00757.x
Subject(s) - phosphate , calcination , chemistry , phosphorus , fluoride , reagent , phosphorite , aluminium , nuclear chemistry , ammonium , crystallization , mineralogy , magnesium , ammonium phosphate , inorganic chemistry , biochemistry , fertilizer , organic chemistry , catalysis
Summary A close relationship exists between inorganic phosphorus fractions and mineralogical changes in ‘C’‐grade Christmas Island rock phosphate calcined at temperatures up to 1100 °C. Amounts of acid‐extractable Ca‐P closely followed the presence and crystallization of calcium phosphates. Amounts of NH 4 F‐P were related to the presence of simple aluminium phosphates. The ammonium fluoride reagent did not extract more complex aluminium phosphates such as crandallite and millisite. These minerals were considered to be present in the 2nd NaOH‐P and residual‐P fractions. NH 4 F‐P plus acid‐extractable Ca‐P was closely related to radish growth responses.