Table 1 Results of certified reference materials for checking the analytical accuracy
Target sample | Reference material | Heavy metal | Analysis method | Certified value | Observed value (n = 3) | Recovery rate |
|---|---|---|---|---|---|---|
Mean ± Ua (mg/kg) | AM ± SDb (mg/kg) | AM ± SD (%) | ||||
Soil | BAM-U112a | As | Total | 10.3 ± 0.5 | 9.8 ± 0.15 | 95.1 ± 1.48 |
Cd | Total | 4.12 ± 0.15 | 4.3 ± 0.06 | 104.4 ± 1.40 | ||
Plant | SRM 1573a | As | Total | 0.112 ± 0.004 | 0.106 ± 0.004 | 95 ± 0.5 |
Cd | Total | 1.52 ± 0.08 | 1.42 ± 0.03 | 93 ± 2.0 |