Interferometric study of the dolomite dissolution: a new conceptual model for mineral dissolution

摘要: Abstract The dissolution rate and mechanism of three different cleavage faces a dolomite crystal from Navarra (near Pamplona), Spain, were studied in detail by vertical scanning interferometry techniques. A total 37 regions (each about 124 × 156 μm size) on the sample surfaces monitored as function time during at 25°C pH 3. Dissolution produced shallow etch pits with widths reaching 20 8 h dissolution. Depth development was remarkably similar for all given surface. On basis pit distribution volume time, calculated increases near zero to 4 10 −11 mol cm −2 s −1 over 5 h. variation is each studied. In addition, absolute rates parts surface can be computed using reference yield an “average” 1.08 standard deviation 0.3 based 60 analyses. mean times slower than alone. other hand, earlier batch data that used BET areas are least 30 faster our directly measured same temperature. conceptual model mineral has been inferred topography obtained investigations. this model, not dominated formation itself but rather extensive stepwaves originate outskirts pits. These control overall well dependence temperature saturation state.