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. 2021 Oct 6;414(11):3341–3348. doi: 10.1007/s00216-021-03653-5

Fig. 2.

Fig. 2

Cyclic voltammograms of bare SPCE (blue), filter paper-modified SPCE (green) and Whatman paper-modified SPCE (red) recorded at different scan rates (25, 50, 100 mV/s) using the redox probe [Fe(CN)6]4− 2 mM in PBS buffer and KCl 3 mM