Study of biomineral formation by bacteria from soil solution equilibria
1998; Elsevier BV; Volume: 36; Issue: 3 Linguagem: Inglês
10.1016/s1381-5148(97)00158-2
ISSN1873-166X
AutoresJesús Párraga, M. A. Rivadeneyra, R. Delgado, Jorge Íñiguez, Miguel Soriano, Gabriel Delgado,
Tópico(s)Clay minerals and soil interactions
ResumoThe role of bacteria in mineral neoformation in a saline soil was studied. In this soil, authigenic precipitation of gypsum and calcite takes place. Bacteria isolated from the soil were cultivated 'in vitro' in solid and liquid media prepared from soil solutions (1: 1 extract). Precipitation of calcite spherulites of between 20 and 50 μm diameter and of other bioliths was observed. From soil solutions (1 : 1 extract and saturation extract) activity coefficients and the states of reaction for 18 minerals were calculated using the SOLMINEQ 88 program. Calcite, dolomite, gypsum and aragonite were in equilibrium with the saturation extract while in the 1:1 extract no mineral phases in equilibrium were present. Therefore, bacteria must play an active role in calcite precipitation in this saline soil.
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