| Sample | Final reading (mL) | Initial reading (mL) | Volume (ml) used for blank sample (B) | Volume (ml) used for water samples (A) | COD in (mg/L) |
| KUMA | 11.8 | 0.0 | 10.3 | 11.8 | 12 |
| TEX | 22.5 | 11.8 | 10.3 | 10.7 | 3.2 |
| Blue Diamond | 35.4 | 22.5 | 10.3 | 12.9 | 20.8 |
| JAH | 44.1 | 35.4 | 10.3 | 8.7 | ˂0.0 |
| JAGISA | 11.3 | 0.0 | 10.3 | 11.3 | 8 |