| Certified value (μg/g) | Mean, n = 23 triplicates (μg/g) | % Recovery | CV |
SRM 1570a (Spinach leaves) | 2.89 ± 0.07 | 2.69 ± 0.05 | 95.5 | 4.71 |
SRM 2710 (Montana soil) | 21.80 ± 0.2 | 21.58 ± 0.31 | 99.00 | 1.43 |