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Effect of scan rate on detection of nitrite by modified electrode; (a) Cyclic voltammograms of 10 mM NO2− at GO-CS-AuNPs/GCE in 0.1 M pH 5.0 PBS at the scan rates of 20, 40, 60, 80, 100, 120, 140, 160, 180 and 200 mV/s, respectively; (b) The current response is positively correlated with the square roof of the scan rate.
