Figure 5

Cyclic voltammograms of (a–c,e) negative samples, and (d,f,g) positive samples, using SPE sensor within a potential window (−0.4 V to 0.0 V).
Cyclic voltammograms of (a–c,e) negative samples, and (d,f,g) positive samples, using SPE sensor within a potential window (−0.4 V to 0.0 V).