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For the electrochemical characterization of the FA sensor, the electrochemical catalytical ability was tested by CV. Figure 3a shows the CV measurements recorded for rGO, Pt–Ag and Pt–Ag/rGO modified SPE, respectively, in 0.1 M NaOH containing 1 mM FA from −0.2 to 0.4 V at a scan rate of 50 mV/s. There is no response from the rGO coated ... asian pragmatic slot