From: 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
Element
Measurement uncertainty, % (k = 2)
Plant aqueous extracts
Plant dry mass
Cd
5.8
8.7
Cr
7.5
8.8
Cu
5.7
8.9
Fe
8.2
8.3
Mn
6.2
6.4
Ni
6.6
Zn
5.9
6.3
As
7.7
9.8