Validation and measurement uncertainty evaluation of the ICP-OES method for the multi-elemental determination of essential and nonessential elements from medicinal plants and their aqueous extracts

Journal of Analytical Science and Technology

Table 1 Wavelengths for selected elements, LoD, and LoQ in aqueous extracts and in dry plants

Element	Wavelength (nm)	Plant aqueous extracts^a			Plant dry mass^b
Element	Wavelength (nm)	LoD (mg L⁻¹)	LoQ (mg L⁻¹)	Target value^c(mg L⁻¹)	LoD (mg kg⁻¹)	LoQ (mg kg⁻¹)	Target value^d(mg kg⁻¹)
Cd	228.805	0.13 × 10⁻³	0.43 × 10⁻³	0.50 × 10⁻³	0.019	0.063	0.05 × 10⁻³
Cr	267.713	0.60 × 10⁻³	2.00 × 10⁻³	5.00 × 10⁻³	0.075	0.25	-
Cu	327.398	0.75 × 10⁻³	2.50 × 10⁻³	200 × 10⁻³	0.12	0.40	-
Fe	238.205	2.24 × 10⁻³	7.46 × 10⁻³	20 × 10⁻³	0.25	0.83	-
Al	396.153	1.59 × 10⁻³	5.30 × 10⁻³	20 × 10⁻³	0.20	0.67	-
Mg	258.213	0.60 × 10⁻³	2.00 × 10⁻³	-	0.11	0.37	-
Pb	220.355	0.29 × 10⁻³	0.97 × 10⁻³	1.00 × 10⁻³	0.043	0.14	0.5 × 10⁻³
Mn	257.611	0.25 × 10⁻³	0.83 × 10⁻³	5.00 × 10⁻³	0.030	0.10	-
Ni	231.604	0.57 × 10⁻³	1.90 × 10⁻³	2.00 × 10⁻³	0.13	0.43	-
Zn	213.856	1.52 × 10⁻³	5.06 × 10⁻³	-	0.22	0.73	-
As	193.759	0.30 × 10⁻³	1.00 × 10⁻³	1.00 × 10⁻³	0.045	0.15	-

^aCalculated for the extraction method (1 g of plant digested with nitric acid and perhydrol in 100 volumetric flask); ^bcalculated for the extraction method (0.5 g of plant extracted in water in 100 volumetric flask); ^c10% of the limit values according to Drinking Water Directive; ^d10% of the limit values according to the European Pharmacopeia.