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A PHOSPHATE SORPTION INDEX FOR SOILS
Author(s) -
BACHE B. W.,
WILLIAMS E. G.
Publication year - 1971
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.1365-2389.1971.tb01617.x
Subject(s) - sorption , phosphate , soil water , chemistry , quotient , logarithm , environmental chemistry , mineralogy , soil science , mathematics , adsorption , geology , organic chemistry , mathematical analysis , pure mathematics
Summary Phosphate sorption isotherms covering a wide concentration range (10 −6 to 5 × 10 −3 m phosphate) were determined for 42 soil samples at 20 °C by a standardized technique. The slope of a plot of the sorption, x , against the logarithm of the equilibrium solution phosphate concentration, log c , measured at c = 10 −4 M, proved a suitable reference index to characterize the phosphate sorbing properties of the soils. Several single‐point methods were tested by statistical correlation against this reference index. Of these, the sorption, x , from one addition of 150 mg P/100 g soil gave r = 0.951, but r = 0.974 when the equilibrium concentration was also taken into account in the quotient x /log c . This quotient is therefore suggested as a simple yet adequate way of indicating a fundamental soil property, its phosphate sorption isotherm.