Recent advances in atomic and molecular spectroscopy

Abstract

The following are summaries of three of the papers presented a t a Joint Meeting of the North East Region and Atomic Spectroscopy and Molecular Spectroscopy Groups held on March 29th-30th, 1988, in the University of Hull.

Removal of brilliant green and malachite green from aqueous solution by a viable magnetic polymeric nanocomposite: Simultaneous spectrophotometric determination of 2 dyes by PLS using original and first derivative spectra

“…The principles and application of partial least squares (PLS) regression and principal component regression in spectrometry have been discussed by several researchers . Recently, the combination of derivative techniques with multivariate calibration methods has been proposed, and the convenience of such an approach has been evaluated by several workers with contradictory results . In this work, a spectrophotometric method has been developed for simultaneous analysis of binary mixtures of dyes (BG and MG) in synthetic samples and some wastewater samples with applying PLS.…”

“…[15][16][17][18] Recently, the combination of derivative techniques with multivariate calibration methods has been proposed, and the convenience of such an approach has been evaluated by several workers with contradictory results. [19][20][21] In this work, a spectrophotometric method has been developed for simultaneous analysis of binary mixtures of dyes (BG and MG) in synthetic samples and some wastewater samples with applying PLS. In addition, the original and first derivative absorption spectra of the binary mixtures were used to perform the optimization of the calibration matrices by the PLS method.…”

Simultaneous determination of nafcillin and methicillin by different fluorimetric techniques using partial least-squares calibration

“…Martens and co-workers [10][11][12] quantified three botanical components, pericarp, aleurone and endosperm, by using several emission scans, recorded at different excitation wavelengths, characteristic of each of the mixture components. Jones et al 13 reported the use of excitation, emission and synchronous spectra for the determination of acyclovir and guanine.…”

Comparison of Chemometric Methods: Derivative Ratio Spectra and Multivariate Methods (CLS, PCR and PLS) for the Resolution of Ternary Mixtures of the Pesticides Carbofuran Carbaryl and Phenamifos After Their Extraction into Chloroform

“…However, their convenience is contradictory. [15][16][17] In this work, the resolution of the ternary mixtures of carbofuran, carbaryl and fenamiphos by extraction-UV spectrophotometry was carried out, using the chemometric methods second-derivative ratio spectra, CLS, PCR, and PLS (types 1 and 2). A comparison of the results obtained in the analysis of synthetic samples by the different methods applied was made by using analysis of variance (ANOVA).The data used were the absorption spectra and their transformations (logarithm or derivative) and these data were preprocessed in different ways (mean centring or variance scaling).…”