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