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Fractionation of Soil Inorganic Phosphate by a Modification of Chang and Jackson's Procedure
Author(s) -
Williams J. D. H.,
Syers J. K.,
Walker T. W.
Publication year - 1967
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/sssaj1967.03615995003100060012x
Subject(s) - fractionation , phosphate , chemistry , extraction (chemistry) , fluoride , sodium hydroxide , chromatography , sodium phosphates , hydroxide , reproducibility , inorganic chemistry , organic chemistry
A modified version of the phosphate fractionation procedure of Chang and Jackson (1957) included the determination of “residual inorg. P” and introduced a revised nomenclature for the other fractions. Added phosphate sorbed during the fluoride extraction was usually completely recovered in the succeeding sodium hydroxide extraction; this enabled mutually compensating corrections to be applied to NH 4 F‐P and 1st NaOH‐P values. A second acid treatment increased the amount of Ca‐P extracted. Further modifications simplified the colorimetric determinations of inorganic phosphate in several of the extracts. A measure of the reproducibility of fractionation results was also obtained.