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Accuracy checks of As, Cd, Pb, Cr and Co measurements using certified reference material (CRM) ERM CD 200 showing certified and mean measured concentration (± SD) in mg kg−1 and recoveries obtained for each analyte in % (n = 6).
| Metal (loid) | Certified value | Mean measured value | Recovery, % |
|---|---|---|---|
| As | 0.50 ± 0.1 | 0.52 ± 0.04 | 104 |
| Cd | 0.50 ± 0.1 | 0.53 ± 0.5 | 106 |
| Pb | 1.0 ± 0.2 | 0.94 ± 0.5 | 94 |
| Cr | - | 0.48 ± 15 | - |
| Co | 50 ± 10 | 0.45 ± 5 | 90 |
Note: SD, standard deviations.
