Multicomponent analysis in the wavelet domain of highly overlapped electrochemical signals: resolution of quaternary mixtures of chlorophenols using a peg-modified sonogel-carbon electrode

摘要: Abstract Chemometric methods have been applied to resolve mixture of phenols; phenolic compounds are amongst the most interesting chemical species from an environmental viewpoint. However, number papers that apply multivariate calibration electroanalytical signals phenols is low. In this paper, we propose a new chemometric methodology resolve, in wavelet domain, quaternary mixtures chlorophenols: 4-chloro-3-methylphenol, 4-chlorophenol, 2,4-dichlorophenol and 2,4,6-trichlorophenol, concentration range 0.05 0.25 mg·L− 1, using differential pulse adsorptive stripping voltammetry (DPAdSV) as electrochemical technique, polyethylenglycol-modified Sonogel–Carbon electrode. The results obtained after applying Fast Wavelet Transform (FWT)-based feature selection algorithm, coupled with different (multilinear regression-MLR partial least squares regression-PLS) compared those direct PLS. Besides, Orthogonal Signal Correction (OSC)-based Calibration Transfer procedure (OSC-CT) also applied, pre-processing tool, order improve previous techniques.