Browsing ELibrary by Author "Ullman W.J."

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FELDSPAR DISSOLUTION IN ACIDIC AND ORGANIC SOLUTIONS: COMPOSITIONAL AND PH DEPENDENCE OF DISSOLUTION RATE

Welch S.A.; Ullman W.J. (1996)

The steady-state dissolution rates of plagioclase feldspars into inorganic acid solutions in a flow-through reactor increased with Al content of the mineral from 1.4.10^-11 mol Si/m^2/s for albite to 5.6.10^-9 mol Si/m^2/s ...
LABORATORY EVIDENCE FOR MICROBIALLY MEDIATED SILICATE MINERAL DISSOLUTION IN NATURE

Ullman W.J.; Kirchman D.L.; Welch S.A.; V; evivere P. (1996)

Bacteria may potentially enhance or inhibit silicate mineral dissolution in nature by a variety of mechanisms. In the laboratory, some microbial metabolites enhanced dissolution rates by a factor of ten above the expected ...
THE EFFECT OF MICROBIAL GLUCOSE METABOLISM ON BYTOWNITE FELDSPAR DISSOLUTION RATES BETWEEN 5° AND 35°C - III. A GENERALIZATION ON THE DISSOLUTION RATES OF MINERALS

Welch S.A.; Ullman W.J. (1999)

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) ...
THE GEOCHEMISTRY OF IODINE IN NEAR-SHORE CARBONATE SEDIMENTS

Ullman W.J.; Aller R.C. (1985)

The total concentration of I is commonly higher in surface terrigenous sediments relative to more deeply buried material. Diagenetic release, loss of dissolved I during burial, and back-reaction of I with the solid phase ...
THE TEMPERATURE DEPENDENCE OF BYTOWNITE FELDSPAR DISSOLUTION IN NEUTRAL AQUEOUS SOLUTIONS OF INORGANIC AND ORGANIC LIGANDS AT LOW TEMPERATURE (5-35°C)

Welch S.A.; Ullman W.J. (2000)

The temperature dependence of silica release from bytownite, a Ca-Al-rich feldspar, was determined in solutions of inorganic and organic ligands at neutral pH from 5°C to 35°C. The apparent activation energy of dissolution ...

Browsing ELibrary by Author "Ullman W.J."

Browsing ELibrary by Author "Ullman W.J."

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