Figure 6
(A) Amperometric i-t response of h-Cr2Se3 modified SPCE for addition of different concentration of 4-NP into the constantly stirred pH 7. Inset is calibration plot for current response vs. [4-NP], and an enlarged view of amperometric response of h-Cr2Se3 modified SPCE for addition of 0.05 µM (a), 0.1 µM (b), 0.2 µM (c), 0.7 µM (d), 1.5 µM (e), 2.5 µM (f), 4 µM (g) and 5.7 µM (h) 4-NP at the working potential of −0.73 V. (B) Amperometric i-t response of h-Cr2Se3 modified SPCE for addition of 10 µM 4-NP and 500 µM additions of dihydroxybenzene isomers and metal ions at pH 7 with the working potential of −0.73 V. (C) At similar conditions, amperometric i-t response of h-Cr2Se3 modified SPCE for addition of 10 µM of 4-NP and 500 µM additions of phenolic and nitro compounds.
