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Table 9 Uncertainty components of Cr in plant aqueous extracts and mass fraction in plant dry mass

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

Symbol Unit Plant aqueous extracts Plant dry mass
Value Standard uncertainty r i Value Standard uncertainty r i
C 1 mg L−1 0.00 0.004 0.5 0.00 0.004 0.5
C 2 mg L−1 0.05 0.004 0.5 0.05 0.004 0.5
C 3 mg L−1 0.10 0.004 0.4 0.10 0.004 0.5
C 4 mg L−1 0.20 0.004 0.4 0.20 0.004 0.4
C 5 mg L−1 0.40 0.004 0.3 0.40 0.004 0.3
C 6 mg L−1 0.60 0.004 0.3 0.60 0.004 0.3
C 7 mg L−1 0.80 0.004 0.0 0.80 0.004 0
C 8 mg L−1 1.00 0.004 0.1 1.00 0.004 0.1
A 1 - 20,190 3,028 0.4 20,190 3,028 0.4
A 2 - 55,030 1,045 0.0 55,030 1,045 0
A 3 - 95,540 840 0.0 95,540 840 0
A 4 - 181,800 1,181 0.0 181,800 1,181 0
A 5 - 355,180 1,882 0.0 355,180 1,882 0
A 6 - 529,800 3,284 0.2 529,800 3,284 0.2
A 7 - 703,882 3,097 0.1 703,882 3,097 0.1
A 8 - 880,011 5,104 0.1 880,011 5,104 0.1
A - 255,400 1,127 0.1 31,140 4,670 0.1
R - 1.00 0.015 20.4 1.00 0.027 35.8
F rep - 1.00 0.029 76.2 1.00 0.029 60.7
C m g L−1 - - - 10 0.001 0.0
Result   0.283 mg L−1 0.019 mg L−1 (6.7%, k = 2)   2.53 mg kg−1 0.202 mg kg−1 (9.0%, k = 2)  
  1. C1 to C8 are the concentrations of calibration standard solutions; A1 to A8 are the respective standard solutions; A is the emission intensity of the sample; R is the recovery from CRM; and Frep is repeatability factor; C m is the concentration of measured sample in digested solution.