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(a) Cyclic voltammograms obtained at the PGMCPE in 0.2 M PBS in pH values, (a) 5.5 (b) 6 (c) 6.5 (d) 7 (e) 7.5 (f) 8 containing Tz (1 × 10−4 M) (b) Plot of anodic peak current vs. pH (5.5–8.0) of Tz (1 × 10−4M) at the PGMCPE (c) Plot of Epc vs pH for Tz (d) The scheme of oxidation of Tz.
