Table 1.
Quality control of measurement for toxic elements (As, Cd, Pb and Cr) among four types of food: rice, wheat, red meat and chicken.
| Toxic Element | As | Cd | Pb | Cr |
|---|---|---|---|---|
| QC (%) * | 94.10 | 98.20 | 97.35 | 94.15 |
| Recovery (%) $ | ||||
| Rice | 92.52 | 109.67 | 115.63 | 96.14 |
| Wheat | 90.59 | 108.80 | 113.27 | 91.85 |
| Meat | 94.18 | 109.77 | 115.28 | 90.14 |
| Chicken | 93.16 | 106.65 | 112.25 | 92.65 |
* Mixed concentration (20 μg/L) of each element was measured after every five measurements; for purpose of continuing calibration verification (CCV). $ Sample of each food type was spiked by adding a mixture of concentration (20 μg/L) of each element.