Table 2.

Comparison of measured and certified data for BCR 482 lichen (μg g⁻¹)

Element	BCR-482 lichen	AAS (UO; %)				AAS (ZÚHK) NDb (%)
	Certified value (μg g−1)	±Uncertainty	Mean	±SD	D a
Cr	4.12	0.15	n.d.	n.d.	n.d.	20
Ni	2.47	0.07	2.16	0.32	−13	20
Cu	7.03	0.19	6.54	0.18	−7.0	10
Zn	100.6	2.2	93.9	2.5	−6.7	10
Cd	0.56	0.02	0.50	0.04	−6.3	20
Pb	40.9	1.4	37.6	0.9	−7.6	20

^aDeviation, the instrumentally measured/certified value expressed (in %) between the results obtained by AAS and the certified value

^bUncertainty of the analytical method (in %) determined for various organic reference materials, as specified in the laboratory accreditation