| Metal | Conc. in sample (mg/L) | Amount added (mg/L) | Conc. in spiked sample (mg/L) | Amount recovered (mg/L) | Recovery (%) |
| Na | 590 | 250 | 830 | 240 | 96 |
| K | 2696 | 500 | 3199 | 503 | 100.60 |
| Ca | 1200 | 500 | 1690 | 490 | 98 |
| Mg | 1230 | 500 | 1700 | 470 | 94 |
| Mn | 497 | 150 | 642 | 145 | 96.70 |
| Fe | 9.90 | 5.00 | 14.40 | 4.50 | 90 |
| Zn | 9.30 | 5.00 | 14.00 | 4.70 | 94 |
| Cu | ND | - | - | - | - |
| Co | ND | - | - | - | - |
| Cd | ND | - | - | - | - |
| Pb | 0.16 | 0.10 | 0.25 | 0.09 | 90 |