Table 3
Assigned and measured concentrations of the SRM 1577c and BCR-186 reference material used for quality control. Values are given with the standard uncertainties and with the 95% confidence interval.
| Elements | Assigned values (NIST 1577c) ± U | Measured value ±U |
|---|---|---|
| 75As, μg/kg | 19.6 ± 1.4 | 20.5 ± 1.1 |
| 111Cd, μg/kg | 97 ± 1.4 | 97.9 ± 2.6 |
| 208Pb, μg/kg | 62.8 ± 1.0 −1.6% | 63.3 ± 2.6 |
| 63Cu, mg/kg | 275.2 ± 4.6 | 271.9 ± 5.7 |
| 57Fe, mg/kg | 197.94 ± 0.65 | 197.43 ± 5.21 |
| 66Zn, mg/kg | 181.1 ± 1.0 | 180.9 ± 1.8 |
| 55Mn, mg/kg | 10.46 ± 0.47 | 10.55 ± 0.25 |
| 52Cr, μg/kg | 53 ± 14 | 51 ± 2.8 |
| 59Co, mg/kg | 0.3 ± 0.018 | 0.31 ± 0.016 |
| 60Ni, μg/kg | 44.5 ± 9.2 | 52.7 ± 4.3 |
| 77Se, mg/kg | 2.031 ± 0.045 | 2.055 ± 0.066 |
| Element | Assigned value (BCR-186) ± U | Measured value ± U |
| Hg (total), μg/g | 1.97±0.04 | 2.02 ± 0.07 |
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