Computer Science
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1969t&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 54, Issue 7, pp.1969-1977
Computer Science
Scientific paper
In order to compare acidolysis and complexolysis during dissolution of phosphate rocks in acidic soils, the dissolution of natural fluorapatite monocrystals was investigated in hydrochloric and citric acids (initial pH: 2.1) under static conditions at 40°C, from 4 h to 43 days. Reacted surfaces were characterized by SEM and XPS. Leaching solutions were analyzed for Ca 2+ , F - , and phosphate concentrations. In both media, the recrystallization of FAp occurred on reacted basal surfaces. Crystal growth was delayed in H 3 Cit with respect to HCl, probably in relation with the chemisorption of a citric species on FAp surfaces. In citric acid, the affinity of carboxylic groups for surface sites promotes the congruent dissolution of FAp. In hydrochloric acid, a Ca-depleted layer is rapidly formed, surface Ca species reducing the dissolution rate.
Baillif Patrick
Ildefonse Jean Pierre
Thirioux Laurence
Touray Jean Claude
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