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Cyclic voltammograms of 5 × 10-4 M pioglitazone HCl in B–R buffer of pH5; without preconcentration (tacc=0 s) (dashed curve), following preconcentration for 30 s (curve 1) and its repetitive cycle at the same mercury drop (curve 2), Scan rate ν=100 mV s-1 and Eacc =-1.5 V.
