Table 4 Robustness evaluation for the analysis of TIG in intravenous infusion solution using the proposed methods

(1) pH of phosphate buffer (2 ± 0.1)

98.96 ± 0.49

–

(2) Concentration of phosphate buffer (20 ± 0.5 mM)

100.27 ± 1.01

–

(3) Injection time (20 ± 1 min)

99.76 ± 0.69

–

(4) Maximum wavelength (λ_max ± 2 nm)

99.36 ± 0.74

101.21 ± 0.52

(5) Volume of reagents

 (a) Volume of 0.01 M MBTH (1 ± 0.05 mL)

–

100.47 ± 0.24

 (b) Volume of 1% W/V Ce (IV) (1.5 ± 0.1 mL)

–

100.51 ± 0.58

(6)Variation in time (35 ± 1 min)

–

99.90 ± 1.05