Browsing by Author "Ullman W.J."
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Browsing by Author "Ullman W.J."
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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 ...
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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 ...
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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) ...
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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 ...
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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 ...
Now showing items 1-5 of 5