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THE DESCRIPTION OF DESORPTION OF PHOSPHATE FROM SOIL
Author(s) -
BARROW N. J.
Publication year - 1979
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.1365-2389.1979.tb00983.x
Subject(s) - desorption , phosphate , incubation , chemistry , adsorption , limiting , incubation period , chloride , calcium , environmental chemistry , inorganic chemistry , biochemistry , organic chemistry , mechanical engineering , engineering
Summary After incubation with soil, phosphate was desorbed in dilute calcium chloride solutions. After short periods of incubation, the amount of phosphate desorbed increased rapidly at first but then net re‐adsorption occurred. After long periods of incubation, desorption was slower and there was no net re‐adsorption with prolonged desorption. Desorption was described in terms of two limiting values: the amount of phosphate ( K ) which would be desorbed as the concentration of phosphate approached zero, and the solution concentration of phosphate (C o ) at which no desorption occurred. Both values decreased as the period of incubation increased. The value of K increased during the desorption phase, but the value of C o decreased. The decrease in C o during desorption was most marked after short periods of incubation and was important in describing the trend for re‐adsorption of phosphate.