Table 1. Surface Complexation Modeling Parameters for Sandstone.
| quartz/brine interface | kaolinite/brine interface32 | |
|---|---|---|
| quartz edge (X = Si) | kaolinite edges (X = Si, Al) | |
| >XOH site density (sites/nm2) | 4.6a | 5.5 |
| specific surface area of quartz (m2/g) | 0.92 | 11.47 |
| log_K at 25 °C | ||
| >XOH + H+ ↔ >XOH2+ | –1.75 | 0.80 |
| >XO– + H+ ↔ >XOH | 6.75 | 7.00 |
| >XOH + Ca2+ ↔ >XOCa+ + H+ | –5.70 | –6.00 |
| >XOH + Mg2+ ↔ >XOMg+ + H+ | –5.70 | –5.55 |
| C1 (F/m2) | 2.253 (H+ interaction) | |
| 3.098 (Ca2+ interaction) | ||
| 4.302 (Mg2+ interaction) | ||
| C2 (F/m2) | 0.2 | |
a
Reference (33).