Fig. 7.

SW stripping voltammograms of model human urine sample from volunteer (diluted with BR buffer at pH 8.0 containing 6 × 10⁻⁴ M CTAB in the ratio of 1:20, v/v): (dashed line) in the absence of favipiravir, (a) in the presence of 0.05 μg mL⁻¹ favipiravir, (b–e) after standard additions to obtain final concentration levels of 0.025, 0.050, 0.075, 0.100 μg mL⁻¹ favipiravir. Inset depicts the result of analysis by standard addition method. The other operating conditions as indicated in Fig. 5.