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Monitoring Pedogenic Inorganic Carbon Accumulation Due to Weathering of Amended Silicate Minerals in Agricultural Soils.
Published on: June 4, 2021
El control microbiano de la degradación de silicatos en las aguas subterráneas ricas en materia orgánica
Science (New York, N.Y.)
|October 9, 1992
Resumen
Las bacterias que se adhieren a la superficie aceleran el desgaste de minerales de silicato en acuíferos contaminados por petróleo. El metabolismo microbiano de los hidrocarburos produjo ácidos orgánicos, mejorando el grabado mineral y la movilización de elementos más allá de las tasas previstas.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Microbiología Microbiología.
- Ciencias ambientales Ciencias ambientales.
Sus antecedentes:
- Los acuíferos poco profundos a menudo contienen contaminantes del petróleo y comunidades microbianas indígenas.
- El desgaste de minerales de silicato es un proceso clave en la geoquímica de los acuíferos y el destino de los contaminantes.
- El papel de las bacterias que se adhieren a la superficie en la diagenesis mineral in situ no se entiende completamente.
Objetivo del estudio:
- Para investigar la influencia de las bacterias que se adhieren a la superficie en la diagenesis de minerales de silicato.
- Para cuantificar las tasas de desgaste de feldespato y cuarzo en un acuífero contaminado por petróleo.
- Para comprender los mecanismos que impulsan el desgaste mineral acelerado.
Principales métodos:
- Estudio del microcosmos in situ utilizando fragmentos de feldespato y cuarzo.
- Incubación en aguas subterráneas anóxicas y ricas en materia orgánica durante 14 meses.
- Análisis utilizando microscopía electrónica de barrido y geoquímica de aguas subterráneas.
Principales resultados:
- Las bacterias indígenas colonizaron las superficies minerales.
- Los minerales exhibieron intemperie química a tasas que excedieron las predicciones teóricas.
- Se observó un grabado mineral localizado en la interfaz bacteria-mineral.
- La movilización de sílice y aluminio se relacionó con la producción de ácido orgánico bacteriano.
Conclusiones:
- Las bacterias que se adhieren a la superficie influyen significativamente en la diagenesis de silicatos en acuíferos contaminados.
- El metabolismo microbiano de los hidrocarburos acelera el desgaste mineral a través de la producción de ácidos orgánicos.
- Este proceso tiene implicaciones para la geoquímica de los acuíferos y el transporte de contaminantes.
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