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Fluorite Solubility in Limed Acid Sandy Soils
Author(s) -
Street J. J.,
Elwali A. M. O.
Publication year - 1983
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/sssaj1983.03615995004700030017x
Subject(s) - fluorite , soil water , chemistry , solubility , precipitation , fluoride , supersaturation , dissolution , environmental chemistry , mineralogy , inorganic chemistry , geology , soil science , physics , organic chemistry , meteorology
The solubility of fluorite (CaF 2 ) in acid sandy soils was investigated via Ca 2+ and F ‐ activity measurements. Fluorite was added to three acid sandy soils previously limed to various pHs between 4.0 and 7.8. The equilibrium Ca 2+ and F ‐ activities in soil water suspensions were determined and compared to published and calculated ion activity products. The data indicated that CaF 2 was the solid phase controlling F ‐ activity in the suspension pH range of 5.5 to 7.0. However, below pH 5.0, the F ‐ activity indicated supersaturation with respect to CaF 2 . The pK ap for CaF 2 prepared in the laboratory was calculated to be 10.50. The results revealed that liming fluoride‐contaminated acid sandy soils may reduce F ‐ in the soil solution by precipitation of CaF 2 .