Fig. 7

(a) DPVs of DBT–CNT/GCE in buffer solution (pH = 7.0) containing different concentrations of IP and PX: from inner to outer corresponds to mixed solutions of 100.0 + 104.1, 300.0 + 312.3, 400.0 + 416.9, 500.0+ 500.3, 700.0 + 700.4, 800.0 + 800.5, 900.0 + 900.6, 1000.0 + 999.7, 1200.0 + 1199.5, and 1300.0 + 1299.8, (b) Calibration plot of IP and (c) Calibration plot of PX