| Element |
| Sample |
|
| First wash | Fifth wash | Tenth wash | |
| O | 47.3 | 50.9 | 63.2 |
| Na | 23.7 | 15.40 | 0.09 |
| Al | 10.6 | 20.3 | 36.20 |
| S | 18.0 | 13.0 | 0.26 |
| Other | 0.40 | 0.40 | 0.25 |