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Linear sweep voltammograms of Sudan I at the MWCNTs modified GCE in 0.1 M PBS (pH 7.0) containing 5.0×10−5 (a), 4.0×10−5 (b), 3.0×10−5 (c), 2.0×10−5 (d), 5.0×10−6 (e), 0 (f) M of Sudan I, respectively. Accumulation time = 3 min. Scan rate: 100 mV/s.
