Second harmonic a.c. polarography

A.c. polarography Second harmonic a.c. polarography Cyclic voltammetry... 

Thus, the contributions of several orders can be accessed experimentally by means of a detection device tuned to the proper frequency. Applications of this principle have thus far been limited to the so-called second-order techniques second harmonic a.c. polarography [25], faradaic rectification [26], and the recently developed demodulation technique [27],... 

Generally, sensitivity in the analytical sense is greater if the technique employed is faster, i.e. the electrolysis time is shorter, or the frequency of a periodic electrolysis is higher. Resolution of half-wave potentials, and thus accuracy of standard potentials and stability constants, is better if a derivative technique such as differential pulse polarography, a.c. polar-ography, and, preferably, the second derivative technique second-harmonic a.c. polarography, is employed. 

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