| After Leaser Cleaning | Before Leaser Cleaning | Elements | Samples |
| 78.82 | 77.58 | Cu | 1 |
| 20.08 | 20.07 | O | |
| 0.78 | 1.69 | Cl | |
| 0.00 | 0.28 | Al | |
| 0.16 | 0.21 | Si | |
| 0.08 | 0.12 | K | |
| 0.09 | 0.05 | Ca |