The Effect of Microbial Glucose Metabolism on Bytownite Feldspar Dissolution Rates Between 5{sup o} and 35{sup o}C

Journal Article · Thu Apr 29 00:00:00 EDT 1999 · Geochimica et Cosmochimica Acta

DOI:https://doi.org/10.1016/S0016-7037(99)00248-3· OSTI ID:834169

Welch, S A ^[1]; Ullman, W J

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1. College of Marine Studies, University of Delaware, Lewes, DE

The rate of Si release from dissolving bytownite feldspar in abiotic batch reactors increased as temperatures increased from 5 to 35 C. Metabolically inert subsurface bacteria (bacteria in solution with no organic substrate) had no apparent effect on dissolution rates over this temperature range. When glucose was added to the microbial cultures, the bacteria responded by producing gluconic acid, which catalyzed the dissolution reaction by both proton- and ligand-promoted mechanisms. The metabolic production, excretion, and consumption of gluconic acid in the course of glucose oxidation, and therefore, the degree of microbial enhancement of mineral dissolution, depend on temperature.

• Research Organization: College of Marine Studies, University of Delaware, Lewes, DE (US)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: FG02-91ER61184
• OSTI ID: 834169
• Journal Information: Geochimica et Cosmochimica Acta, Journal Name: Geochimica et Cosmochimica Acta Vol. 63; ISSN GCACAK; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
59 BASIC BIOLOGICAL SCIENCES
BACTERIA
CATALYSTS
DISSOLUTION
FELDSPARS
GLUCONIC ACID
GLUCOSE
METABOLISM
OXIDATION
TEMPERATURE DEPENDENCE