| Metal | Conc. in sample (mg/kg) | Amount added (mg/kg) | Conc. in spiked sample (mg/kg) | Amount recovered (mg/kg) | Recovery (%) |
| Na | 2500 | 500 | 2990 | 490 | 98 |
| K | 3345 | 600 | 3946 | 601 | 100.20 |
| Ca | 1670 | 500 | 2160 | 490 | 98 |
| Mg | 2438 | 500 | 2933 | 495 | 99 |
| Mn | 1296 | 500 | 1798 | 502 | 100.40 |
| Fe | 3694 | 600 | 4284 | 590 | 98.30 |
| Zn | 11.90 | 5.00 | 16.50 | 4.60 | 92 |
| Cu | 35.00 | 15.00 | 49.0 | 14.0 | 93.30 |
| Co | ND | - | - | - | - |
| Cd | 0.20 | 0.1 | 0.29 | 0.09 | 90 |
| Pb | 0.26 | 0.1 | 0.35 | 0.09 | 90 |