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Arsenic content in mineral residue before and after digestion with hydrochloric acid
| Run | Residue before digestion % arsenic | Residue after digestion % arsenic | Difference % arsenic |
| 1 | 3.5208 | 2.6332 | 0.8876 |
| 2 | 3.5751 | 2.7105 | 0.8646 |
| 3 | 3.6283 | 3.0034 | 0.6249 |
| 4 | 3.6452 | 2.9911 | 0.6541 |
| 5 | 3.5291 | 2.5907 | 0.9384 |
| 6 | 3.5325 | 2.5821 | 0.9504 |
| 7 | 3.6334 | 2.9436 | 0.6898 |
| 8 | 3.6021 | 2.9784 | 0.6237 |
