a. Why is square wave voltammetry more sensitive than sampled current voltammetry?
b. Explain why the peak shape in square wave voltammetry is the derivative of the peak shape in sampled current voltammetry in Figure 17-28.

 Figure 17-28

Transcribed Image Text:

Current (A) -30 -20 -10 0 1 1 E 0.0 Square wave -0.2 -0.6 -0.8 Potential (V vs. S.C.E.) Harris/Lucy, Quantitative Chemical Analysis, 10e, 2020 W. H. Freeman and Company Sampled current -0.4 -1.0 -1.2 FIGURE 17-28 Comparison of polarograms of 5 mM5 mM Cd2+Cd²+ in 1 M HCL 1 M HCl. Waveforms are shown in Figures 17-23 and 17-27. Sampled current: drop time-Is, drop time = 1. 8, step height-4 mV, step height=4 V, 7, sampling time-17 ms sampling time = 17 ms. Square wave: drop time=1 s, drop time = 18, step height-4 mv,step height = 4 mV, pulse period-67 ms, pulse period = 67 cas, pulse height-25 mv pulse height = 25 mV, sampling time = 17 ms. sampling time-17 ms.