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. 2022 Jan 7;12:117. doi: 10.1038/s41598-021-03495-2

Figure 8.

Figure 8

(A) Square wave adsorptive stripping voltammograms at GN:ZnO NC/GCE at different concentrations of p-NP using phosphate buffer (pH 6.8). Deposition-potential: − 1.0 V, deposition-time: 300 s. (B) Plot of concentration of p-NP aganist peak current with error bars. (C) SW-AdS voltagrams for p-NP determination using standard adition method spiked with (1) 35.61 × 10–8 M ,(2) 71.22 × 10−8 M and 106.83 × 10–8 M p-NP in river water sample. (D) SW-AdS voltagrams for p-NP determination using standard adition method spiked with (1) 35.61 × 10–8 M , (2) 71.22 × 10−8 M and 106.83 × 10–8 M p-NP in ground water sample.