Figure 1 | Scientific Reports

Figure 1

From: Direct Experimental Evidence for Differing Reactivity Alterations of Minerals following Irradiation: The Case of Calcite and Quartz

Figure 1

The dissolution rate (T = 25° ± 3 °C, p = 1 bar) as a function of solution pH for:

(a) SiO2 based solids and (b) CaCO3 based solids. In the case of SiO2 based solids, the dissolution rate increases with pH, while the opposite is true for CaCO3 based solids. It is noted that, while quartz shows slight, if any, sensitivity to surface orientation, calcite dissolution appears more sensitive to surface orientation and potentially solid composition (i.e., impurities present in the natural limestone). The thick solid lines show trends in dissolution rates while the thin dashed lines show the corresponding uncertainty bounds. The trend lines are fitted to an equation of the form: DR = A · exp(±B · pH), where A and B are numerical constants. The highest uncertainty in the measured dissolution rates is on the order of ±0.5 log units.

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