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Elimination of Interference by Phosphorus and Other Elements in the Flame Photometric Determination of Calcium and Magnesium in Plant Tissue
Author(s) -
Wells C. G.,
Corey R. B.
Publication year - 1960
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/sssaj1960.03615995002400030019x
Subject(s) - magnesium , chemistry , phosphorus , calcium , combustion , interference (communication) , precipitation , analytical chemistry (journal) , inorganic chemistry , chromatography , meteorology , organic chemistry , channel (broadcasting) , electrical engineering , engineering , physics
A rapid, accurate flame photometric method was devised for determination of Ca and Mg in plant tissue. Interferences by P and any Fe and Al that might be present were eliminated by addition of FeCl 3 to the acid plant ash extract and precipitation of P, Fe and Al by neutralizing to pH 5.6 with NH 4 OH. A positive interference by K was corrected by addition of 500 ppm. K to all solutions. NH 4 OAc was added to prevent clogging of the burner capillary by the NH 4 Cl solution. Results obtained with the new method agreed well with those obtained with AOAC methods.