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Formation of Surface Coatings on Limestone Particles in Soils
Author(s) -
Barrows H. L.,
Simpson E. C.,
Tu H. Y.
Publication year - 1966
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/sssaj1966.03615995003000030009x
Subject(s) - calcite , soil water , wetting , coating , porosity , recrystallization (geology) , weathering , adsorption , precipitation , mineralogy , materials science , chemistry , geology , composite material , geochemistry , soil science , paleontology , physics , organic chemistry , meteorology
High‐purity, 12‐ to 14‐mesh calcite limestone was mixed into acid soils containing relatively large amounts of either P, Al, or Mn. These mixtures were equilibrated for 12 months, undergoing wetting and partial drying cycles. Samples of each mixture were withdrawn periodically, and the limestone particles were recovered and examined. The surface of particles equilibrated in the high‐P soil developed a porous, white granular coating. Ater 7 months' equilibration, this coating varied from about 0.03 to 0.1 mm in thickness. It was concluded that the coating formed through the combined processes of weathering, recrystallization of calcite, and adsorption and/or precipitation of phosphates from the soil.