Table 1.
Certified and recovered values for CRM 7405-a.
| Analyte | Total Concentration of Metals in CRM 7405-a (mg/kg) | % Recovery | |
|---|---|---|---|
| Certified Value | Recovered | ||
| K | 47,500 ± 700 | 46,550 ± 686 | 98.0 |
| Ca | 15,200 ± 300 | 15,048 ±297 | 99.0 |
| Mg | 6790 ± 100 | 6620 ± 97.5 | 97.5 |
| Pb | 0.43 ± 0.03 | 0.45 ± 0.04 | 104.7 |
| Cd | 0.79 ± 0.02 | 0.75 ± 0.03 | 94.9 |
| Al | 147 ± 7 | 141 ± 6 | 95.9 |
| Mn | 14.1 ± 0.7 | 14.5 ± 0.6 | 102.8 |
| Cu | 1.55 ± 0.07 | 1.52 ± 0.06 | 98.1 |
| Zn | 13.4 ± 0.5 | 13.1 ± 0.4 | 97.7 |
| Fe | 311 ± 11 | 317 ± 8 | 101.9 |
| As | 35.8 ± 0.9 | 35.26 ± 0.88 | 98.5 |
| Na | 16,200 ± 200 | 16,038 ± 198 | 99.0 |
| Ni | 2.2 ± 0.1 | 2.3 ± 0.08 | 104.6 |
| Cr | 3.4 ± 0.1 | 3.29 ± 0.09 | 96.8 |