Coprecipitation of phosphate with calcite.
1981; The Geochemical Society of Japan; Volume: 15; Issue: 5 Linguagem: Inglês
10.2343/geochemj.15.283
ISSN1880-5973
AutoresMasamichi Ishikawa, Masami Ichikuni,
Tópico(s)Chemical Synthesis and Characterization
ResumoThe mechanism of phosphate coprecipitation with calcite is proposed on the basis of homogeneous distribution of phosphate in the crystal at 20°C and pH 7.9-9.5. At a constant pH, phosphate content of calcite is proportional to total phosphate concentration in aqueous solution. PO3-4 ions are uptaken into the calcite lattice, where 3 CO2-3 ions are replaced by 2 PO3-4 ions in aqueous solution, as described by the ion exchange equilibrium: 3(CO2-3)S + 2(PO3-4)L ↔ 3(CO2-3)L + 2(PO3-4)S where S and L represent calcite and aqueous solution, respectively.
Referência(s)