Table 4.
Validation statistics
| Method | Statistic | Bean | Cowpea | Maize | |||
|---|---|---|---|---|---|---|---|
| Fe | Zn | Fe | Zn | Fe | Zn | ||
| ICP-OES | Range | 50.0–83.8 | 24.3–37.9 | 50.2–79.7 | 28.5–59.4 | 11.4–30.1 | 16.7–37.6 |
| Avg RSD | 0.8 | 0.7 | 0.9 | 0.9 | 1.7 | 1.5 | |
| Oxford Instruments | r2 | 0.97 | 0.93 | 0.97 | 0.98 | 0.91 | 0.92 |
| X-Supreme 8000 | SEP | ±2.8 | ±1.7 | ±1.8 | ±1.4 | ±1.3 | ±1.8 |
| 95% CI | ±5.5 | ± 3.3 | ±3.5 | ± 2.8 | ±2.5 | ±3.5 | |
| Biasa | - 0.18 | + 0.36 | - 0.05 | - 0.08 | + 0.13 | - 0.34 | |
| Avg SD | 1.0 | 2.5 | 0.72 | 1.9 | 0.58 | 2.5 | |
| Avg RSD | 1.6 | 3.0 | 1.1 | 1.1 | 1.8 | 1.5 | |
| Bruker | r2 | 0.96 | 0.93 | 0.98 | 0.99 | 0.92 | 0.95 |
| S2 Ranger | SEP | ±2.5 | ±1.5 | ±1.9 | ±1.4 | ±1.2 | ±1.2 |
| 95% CI | ±5.0 | ± 3.0 | ± 3.7 | ± 2.8 | ±2.3 | ±2.3 | |
| Biasa | + 0.46 | + 0.93 | + 0.60 | + 0.81 | - 0.37 | + 0.50 | |
| Avg SD | 1.3 | 0.49 | 1.5 | 0.52 | 0.77 | 0.44 | |
| Avg RSD | 2.0 | 1.7 | 2.3 | 1.2 | 3.8 | 1.9 | |
All units are presented as mg kg-1 , apart from RSD (%) and r2