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Science 6 August 1999:
Vol. 285. no. 5429, pp. 874 - 876
DOI: 10.1126/science.285.5429.874
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Reports

Quantitative Assessment of Reactive Surface Area of Phlogopite During Acid Dissolution

Eric Rufe, Michael F. Hochella Jr.

The reactive surface area of a dissolving sheet silicate, phlogopite, was quantitatively assessed in experiments performed in the fluid cell of an atomic force microscope at room temperature and pH values of 2 and 5.7. Additional assessment was provided by surface chemical analysis and electron diffraction. Dissolution rates of phlogopite {hk0} edges are in the range of 10-10 moles per square meters per second, two orders of magnitude faster than bulk rates for this mineral. The basal {001} surfaces also show distinct reactivity, although it is short-lived before they become relatively inert. These basal surfaces are shown to leach, hydrate, and expand to an amorphous silica-enriched film.

Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0420, USA.

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