Table 1.
Analytical results obtained for validation of the optimized procedure after spiking with standard solutions
| Metal | Type of tobacco sample | Amount in unspiked sample (μg/g) | Amount added (μg/g) | Amount in spiked sample (μg/g) | (%) Recovery |
|---|---|---|---|---|---|
| Cd | Shewa Robit raw tobacco leaves | 1.30 ± 0.04 | 0.26 | 1.54 ± 0.07 | 92.3 ± 6.0 |
| Billate processed tobacco leaves | 1.45 ± 0.023 | 0.6 | 2.03 ± 0.03 | 96.7 ± 1.9 | |
| Nyala processed tobacco leaves | 1.55 ± 0.23 | 0.6 | 2.11 ± 0.06 | 93.3 ± 3.6 | |
| Cr | Shewa Robit raw tobacco leaves | 1.45 ± 0.11 | 0.6 | 1.99 ± 0.12 | 90.0 ± 7.8 |
| Billate processed tobacco leaves | 1.65 ± 0.08 | 0.6 | 2.23 ± 0.03 | 96.7 ± 1.7 | |
| Nyala processed tobacco leaves | 1.62 ± 0.11 | 0.6 | 2.19 ± 0.08 | 95.0 ± 4.5 | |
| Cu | Shewa Robit raw tobacco leaves | 7.30 ± 0.19 | 1.0 | 8.34 ± 0.02 | 104 ± 0.3 |
| Billate processed tobacco leaves | 9.80 ± 0.04 | 1.0 | 10.8 ± 0.08 | 102 ± 1 | |
| Nyala processed tobacco leaves | 8.95 ± 0.31 | 1.0 | 10.0 ± 0.24 | 107 ± 3.1 | |
| Ni | Shewa Robit raw tobacco leaves | 1.96 ± 0.08 | 0.6 | 2.49 ± 0.02 | 88.3 ± 0.9 |
| Billate processed tobacco leaves | 2.35 ± 0.19 | 0.6 | 2.91 ± 0.08 | 93.8 ± 3.6 | |
| Nyala processed tobacco leaves | 4.70 ± 0.04 | 0.6 | 5.25 ± 0.25 | 91.7 ± 6.1 | |
| Zn | Shewa Robit raw tobacco leaves | 33.2 ± 1.9 | 1.4 | 34.6 ± 0.25 | 104 ± 0.9 |
| Billate processed tobacco leaves | 101 ± 0.4 | 1.4 | 103 ± 0.4 | 106 ± 0.5 | |
| Nyala processed tobacco leaves | 79.3 ± 0.77 | 1.4 | 80.6 ± 0.37 | 94.3 ± 0.6 |