Fig. 7From: Simultaneous and sensitive determination of ascorbic acid, dopamine and uric acid via an electrochemical sensor based on PVP-graphene compositeCVs obtained on PVP-GR/GCE in phosphate buffer solution PBS (0.1 M, pH 6.0) in the presences of 1.0 mM AA (a), 20 μM DA (b) and 50 μM UA (c) respectively by different scan rates (20, 40, 60, 80, 100, 120, 140, 160, 180, 200 mV s−1)Back to article page