Table 5.
Analysis of CRMs and dried baby shrimp for total As
| CRM/RM | Certificate value, μg g−1 ± Ua | Measured value, μg g−1 ± Ua |
|---|---|---|
| BCR 627 | 4.8 ± 0.3 | 4.8 ± 1.6 |
| DORM 2 | 18 ± 1.1 | 17.3 ± 2.2 |
| TORT 2 | 21.6 ± 1.8 | 20.7 ± 3 |
| TORT 3 | 59.5 ± 3.8 | 62 ± 6 |
| G99 3 | 1.4 ± 0.3 | 1.21 ± 0.29 |
| G99 14 | 0.79 ± 0.2 | 0.68 ± 0.15 |
| Dried baby shrimp | Portable XRF, μg g−1 ± uc | DRC-ICP-MS, μg g−1 (SD)b |
| Home A shrimp | 30 ± 2 | 28 (5.2) |
| Home B shrimp | 17 ± 1 | 17.1 (3.4) |
| Home C shrimp | 6 ± 1 | 6.9 (0.1) |
a
The uncertainty (U) in certified values is defined on the relevant CRM certificate, whereas for measured values, U is defined elsewhere.48
b
The SD reported here represents the spread of results across multiple shrimp from the same lot, and thus includes biological variation.