| Number | Samples code | CN in ppm (mg/kg) |
| 1 | S2 Sedi-CN | 0.00 |
| 2 | S2 Sol-T | 0.00 |
| 3 | EBCN | 0.00 |
| 4 | S1EFCN | 0.00 |
| 5 | S2EFCN | 0.00 |
| 6 | S1ESCN | 0.00 |
| 7 | S2ESCN | 0.00 |
| 8 | WHO standard | 0.005 |