Table 2.
Accuracy (% recovery) and precision (% RSD) in determination of total and inorganic arsenic in herbs.
| Arsenic spiked (ng/g) |
Intraday (n = 6) | Interday (n = 6) | ||||
|---|---|---|---|---|---|---|
| Found (ng/g) (mean ± SD) |
RSD (%) |
Recovery (%) | Found (ng/g) (mean ± SD) |
RSD (%) |
Recovery (%) | |
| Total arsenic | ||||||
| 250 | 244 ± 8.53 | 3.49 | 97.7 | 237 ± 6.68 | 2.82 | 94.9 |
| 500 | 473 ± 13.6 | 2.88 | 94.6 | 478 ± 21.2 | 4.43 | 95.6 |
| 1000 | 945 ± 32.6 | 3.45 | 94.5 | 972 ± 48.5 | 5.00 | 97.2 |
| 2500 | 2,370 ± 41.4 | 1.75 | 94.7 | 2.38 × 103 ± 40.5 | 1.70 | 95.3 |
| Inorganic arsenic |
||||||
| 50 | 47.4 ± 2.54 | 5.37 | 94.8 | 47.7 ± 2.57 | 5.38 | 95.3 |
| 100 | 98.1 ± 4.81 | 4.91 | 98.1 | 97.9 ± 3.36 | 3.43 | 97.9 |
| 500 | 469.8 ± 25.2 | 5.35 | 94.0 | 473 ± 21.9 | 4.63 | 94.6 |
| 1000 | 943.8 ± 13.4 | 1.42 | 94.4 | 941 ± 11.1 | 1.18 | 94.1 |