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. 2021 Mar 26;37(2):169–181. doi: 10.1007/s12550-021-00428-w

Table 2.

Comparison between certified and measured concentrations of certified reference materials

Material Analyte Certified concentration (ng/mL) Measured concentration
(ng/mL) (n = 3)
2009M1761 β-ZEL 1.06 0.94 ± 0.11
β-ZAL 6.63 6.56 ± 0.49
α-ZAL 3.22 2.91 ± 0.10
ZAN 1.09 0.95 ± 0.02
2009M1764 β-ZEL 1.59 1.35 ± 0.03
β-ZAL 16.52 16.15 ± 0.27
α-ZAL 8.56 8.09 ± 0.31
ZAN 2.86 2.75 ± 0.12