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Table 6 Results from the repeatability study for two levels of concentration

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 Average (μg L−1) sr(%) r(%) Average (μg L−1) sr(%) r(%)
Cd 23.6 6.8 19 211 3.6 10
Cr 24.6 7.1 20 208 3.7 10
Cu 26.1 6.4 18 198 4.4 12
Fe 25.5 9.5 27 221 6.3 18
Al 25.0 6.2 17 213 3.8 11
Mg 25.3 4.1 11 200 2.9 8.1
Pb 24.6 7.1 20 222 3.2 9.0
Mn 24.8 7.4 21 232 4.1 11
Ni 26.3 7.8 22 215 5.2 15
Zn 25.1 6.9 19 225 4.7 13
As 24.3 8.8 25 208 6.5 18
  1. sr, standard deviation of repeatability; r, limit of repeatability (sr × 2.8).