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Gradient Elution of Soil Phosphorus
Author(s) -
Avnimelech Y.,
Hagin J.
Publication year - 1965
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/sssaj1965.03615995002900040014x
Subject(s) - solubility , elution , chemistry , leaching (pedology) , extraction (chemistry) , phosphorus , soil water , chromatography , environmental chemistry , soil science , environmental science , organic chemistry
Soil phosphorus was fractionated by the means of gradient elution technique used in chromatography. This method involves a nonequilibrium extraction of the soil P, whereas conventional methods are based on equilibrium extraction. Non‐equilibrium extraction is needed in order to describe the fate of the applied P before it reaches equilibrium with the entire soil system. Soil samples were leached with a solution of linearily increasing acidity. Thus soil P was fractionated according to its solubility in acid. Upon leaching a soil sample, fertilized with superphosphate, two steps in P fixation could be demonstrated. The first step was a rapid one, decreasing the water solubility of the P, yet keeping it soluble in mildly acidic solutions. In the second slower step, P solubility in acidic solutions was decreased.