Other wavelet transform applications in voltammetry

Another research team has successfully applied WT in voltammetric studies. Specifically, WT was applied to process DPV signals [32], potentiometric-titration- [33], and oscillographic chronopotentiometric signals [34,35]. Chen et al. [32] proposed a new type of wavelet function, the difference of 

Gaussians (DOG), to process differential pulse voltammetric signals. The function is defined as  

Oscillographic chronopotentiometry is a new type of electroanalytical technique, developed in the P. R. China [35]. This technique is based on the change of oscillographic signal on the cathode ray oscilloscope. Harr and Daubechies wavelet functions were employed by another group in the P. R. China to de-noise the oscillographic signals of Pb(II) ions in NaOH solution and multi-components systems such as Cu(II) and Al(III) ions in LiCl solution and Cd(II) and In(III) in NaOH solution [34,35]. They found that this 

the wavelet de-noising process was performed separately on Sa and Sb. and the de-noised signals were then recombined to regenerate the signal in the original domain. 

In conclusion, researchers in the P.R. China have applied WT successfully in electroanalytical studies, and we hope that this Chapter will introduce the works from the P.R. China to the other chemists around the world. 

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