Table 2.
Concentrations of elements in the gypsum samples’ surface layers according to XPS data (at. %).
| Sample | C | O | Ca | S | P | Si | Ru |
|---|---|---|---|---|---|---|---|
| G-1 | 10.2 | 58.7 | 15.1 | 16.0 | - | - | - |
| G-2 | 10.1 | 57.0 | 15.8 | 17.1 | - | - | - |
| G-3 | 13.7 | 52.3 | 14.9 | 19.1 | - | - | - |
| G-3et | 10.0 | 54.2 | 15.8 | 20 | - | - | - |
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