| Time-lapse fluorescence imaging immediately above the crystal surface | pH increased from approximately 6 and stabilized at approximately 9; Ca2+ concentration rapidly increased to approximately 200 µM |
|---|---|
| Time-lapse fluorescence imaging around the crystal | pH and Ca2+ concentrations increased concentrically; Ca2+ concentration increased at crystal protrusions, whereas the pH distribution became more concentric |
| Dissolution rate derived from the imaged Ca2+ concentration profile using DCa = 1 × 10⁻⁵ cm² s⁻¹ | approximately 10-10.0 mol cm⁻² s⁻¹ just after sinking into solution; approximately 10-10.8 mol cm⁻² s⁻¹ after 30 min |
| OH− amount after 30 min | 4.9 × 10⁻¹⁵ mol calculated from the experimentally obtained Ca2+ concentration under the stated dissolution, equilibrium, and diffusion assumptions; approximately 1.0 × 10⁻¹⁵ mol calculated directly from the measured pH change using the ionic product of water |
Kohsei Miki, Jun Kawano, Makoto Yazaki, Takashi Toyofuku, Sakiko Kawanishi, Yukiko Nagai, Takaya Nagai. “Simultaneous pH and Ca2+ imaging of nonstoichiometric calcite dissolution.” ChemRxiv (). https://doi.org/10.26434/chemrxiv.15007473/v1
The main paper refers to supporting information, but no separate supporting information file was found among the files available from the ChemRxiv record