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Título del libro: Water-Rock Interaction - Proceedings Of The 13th International Conference On Water-Rock Interaction, Wri-13
Título del capítulo: Kinetics of acid buffering reactions in Acrisols from southeast Mexico

Autores UNAM:
LUCY NATIVIDAD MORA PALOMINO; CHRISTINA DESIREE SIEBE GRABACH;
Autores externos:

Idioma:
Inglés
Año de publicación:
2010
Palabras clave:

Acid buffering; Acid reactions; Acrisols; Batch experiments; Exchange resin; Exchangeable cation; Fe oxide; Gas processing; Me-xico; Medium term; Plant roots; Short term; Soil biota; Dissolution; Experiments; Metallic compounds; Sulfur dioxide; Soils


Resumen:

In southeast Mexico, the petroleum industry emits large amounts of SO 2 to the atmosphere, which in turn acidifies soils. We investigated the kinetics of acid reactions in Ah and Bt horizons of Acrisols located at different distances from a gas processing facility. We conducted batch experiments with different reaction times with soil buffered at pH 3 in which exchanged or dissolved ions were adsorbed by an exchange resin. Short term (firsts 100 h) experiments released mostly Mg and K and later also large amounts of Ca. Medium term reactions (200-1000 h) were dominated by Al and Fe oxide dissolution. Long term reactions (>1000 h) included the dissolution of primary minerals like hornblende, which were added to the soils during the latest eruption of El Chichón volcano. Buffering reactions promote losses of exchangeable cations and an increase of exchangeable Al, which puts soil biota and plant roots at risk. © 2010 Taylor & Francis Group, London.


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