Fig. 9.

Representative results of repeated measurements of Cd (9 μM) and Pb (5 μM) metals in sodium acetate buffer over a 5 day period by two different sensors. Between measurements sensors were cleaned and stored in ambient air. All analytes were pre-concentrated at −1.8 V for 600 s; for clarity only data for two sensors on days 1, 3, and 5 are presented