Wavelength region selection and spectrophotometric simultaneous determination of naphthol isomers based on net analyte signal
Journal: Iranian Chemical Communication (Vol.5, No. 2)Publication Date: 2017-04-01
Authors : Ahmadreza Amraei; Ali Niazi; Mohammad Alimoradi;
Page : 207-216
Keywords : Wavelength selection; hybrid linear analysis; naphthol isomers; wastewater; spectrophotometric;
Abstract
Naphthol isomers were simultaneously and spectrophotometrically determined in wastewater, using a model based on net analyte signal (NAS). The calibration method used is a variation of the original hybrid linear analysis method as proposed by Goicoechea and Olivieri (HLA/GO). Owing to spectral interferences, the simultaneous determination of mixtures of naphthol isomers, using a spectrophotometric method, is difficult. A rapid and powerful method was used for wavelength selection in the modeling step, based on the minimization of the error indicator (EI), which was estimated as a function of the moving spectral region. The calculation of the net analytical signal using a modified HLA/GO method allows us to determine several figures of merit, as selectivity, sensitivity, analytical sensitivity and limit of detection of the proposed multivariate calibration. The limit of detection (LOD) for 1 and 2-naphthol, were 0.04 and 0.06 (µg/mL) respectively. The proposed model was tested in the analysis of wastewater samples, without previous sample preparation steps, obtaining recovery values between 98 and 104.00%, for 1-naphthol and between 97.00 and 103.00%, for 2-naphthol.
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Last modified: 2019-06-26 14:20:01