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Adsorption of sulphate and fluoride by variable charge soils
Author(s) -
ZHANG G. Y.,
ZHANG X. N.,
YU T. R.
Publication year - 1987
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.1365-2389.1987.tb02120.x
Subject(s) - adsorption , soil water , fluoride , chemistry , inorganic chemistry , ferric , environmental chemistry , geology , soil science , organic chemistry
SUMMARY The adsorption of sulphate and fluoride by three variable charge soils was studied. Adsorption increased with increase in the amount of sulphate added at constant p H, and decreased with increase of p H. The ratios of the amount of released OH − to that of the adsorbed SO 2‐ 4 at pH 5–0 were 0.12, 0.14 and 0.20 for the three soils, respectively, much lower than the corresponding OH − /F − ratios which ranged from 0.3 to 1.0. For a ferric acrisol the OH − released accounted, on average, for only 15% of the SO 2‐ 4 adsorbed, leaving more than 60% to be explained by the decrease in positive charge and the increase in negative charge carried by the soil.