Simultaneous determination of APAP and AA
Differential pulse voltammetry, which has a high current sensitivity and a low charging contribution to the background current, was used to estimate the lower limit of detection. Fig. 4 shows the simultaneous differential pulse voltammetry responses of APAP (10.0 μM) and AA (50.0 μM) on the surface of the SWCNT/CCE. As can be seen, two sharp and well-resolved anodic peaks at −62 and 302 mV appear, representing APAP and AA, respectively. The resultant separation in two peak potentials is sufficient (364 mV) to achieve accurate simultaneous determination of APAP and AA in mixtures.