697698.fig.004a
(a)
697698.fig.004b
(b)
Figure 4: Calibration graphs (left sides) and Eadie-Hofstee plots (background subtracted steady-state current as a function of electrode sensitivity, right sides) registered at an applied potential of −50 mV (Ag/AgCl, 1 M KCl); phosphate-citrate buffer, pH 7.0; temperatures: (a) 25°C, (b) 30°C.