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Amperograms obtained from the measurements of carbaryl in the concentration range from 20 to 100 μM in 0.1 M phosphate buffer of pH 4 at the applied potential (Edc) of 0.2 V using (a) SPCE-A400, (c) SPCE-A600, and (e) SPCE-A800; inset: Cotrell plot was taken from each figure. The corresponding calibration plot of carbaryl concentration versus their slopes obtained from the Cotrell plot measured with (b) SPCE-A400, (d) SPCE-A600, and (f) SPCE-A800.
