Table 6 Evaluation of the proposed method robustness

Parameter

RIV

 (a) Volume of reagent Ag-NPs (0.40 ml ± 0.03)

  0.37 ml

99.11 ± 0.56

  0.40 ml

99.95 ± 0.10

  0.43 ml

99.25 ± 1.06

 (b) Excitation wavelength (258 nm ± 2)

  256 nm

101.94 ± 0.92

  258 nm

100.65 ± 0.20

  260 nm

100.63 ± 0.88

Parameter

EDT

 (a) Volume of reagent Ag-NPs (0.40 ml ± 0.02)

  0.38 ml

100.63 ± 0.38

  0.40 ml

100.39 ± 1.10

  0.42 ml

99.41 ± 1.13

 (b) Excitation wavelength (258 nm ± 2)

  256 nm

99.65 ± 0.93

  258 nm

100.39 ± 1.10

  260 nm

100.32 ± 0.19