Table 8 Recovery analysis (n = 2) of heavy metals and LODs of investigated methods for method validation
Method | Percentage, LOD (µg/g) | ||||
|---|---|---|---|---|---|
Cd | Cr | Pb | As | Se | |
Method 1 (HNO3) | 96.80, 0.0076 | 95.20, 0.094 | 70.70, 0.012 | 80.00, 0.152 | 72.50, 0.0049 |
Method 2 (HNO3 overnight) | 99.50, 0.0052 | 97.30, 0.0026 | 100.00, 0.0047 | 89.30, 0.014 | 100.03, 0.0084 |
Method 3 (HNO3 and H2O2) | 94.80, 0.016 | 74.90, 0.062 | 75.80, 0.186 | 95.60, 0.021 | 72.00, 0.0124 |
Method 4 (HNO3 –HClO4) | 76.20, 0.002 | 93.50, 0.068 | 74.90, 0.0052 | 90.20, 0.065 | 86.10, 0.0325 |
Method 5 (H2SO4) | 80.60, 0.018 | 56.00, 0.128 | 65.00, 0.194 | 58.80, 0.176 | 71.20, 0.0982 |
Method 6 (Dry ashing) | 113.60, 0.0142 | 87.40, 0.0014 | 84.70, 0.024 | 93.20, 0.052 | 60.20, 0.0018 |