Chemometrics-assisted cyclodextrin-enhanced excitation?emission fluorescence spectroscopy for the simultaneous green determination of bisphenol A and nonylphenol in plastics

ROCÍO B. PELLEGRINO VIDAL; GABRIELA IBAÑEZ; GRACIELA ESCANDAR

TALANTA

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2015 vol. 413 p. 162 - 168

0039-9140

This work presents a novel green approach for the simultaneous determination of bisphenol A (BPA) and 4-nonylphenol (NP), two relevant priority chemicals, combining the sensitivity of molecular fluorescence in organized media and the selectivity of second-order chemometric algorithms. Excitation-emission fluorescence matrices, measured in an aqueous methyl-β-cyclodextrin solution, were processed by applying parallel factor analysis (PARAFAC) and partial least-squares coupled to residual bilinearization (PLS/RBL). The feasibility of unfolded PLS/RBL to successfully quantify both analytes is demonstrated, in spite of their very similar fluorimetric spectral profiles. Using a recent IUPAC-consistent approach, limits of detection in the ranges 1?2 and 4?14 ng mL?1 were calculated in validation samples for BPA and NP, respectively, and relative prediction errors between 3?8 % were achieved. The applied algorithm also faced the challenge of solving the strong spectral overlapping with other sample components, as was demonstrated in the analysis of diverse plastic materials. Satisfactory results were obtained using very simple analytical protocol and without using massive amounts of organic solvents. In positive samples, after an easy treatment with a small volume of ethanol at 35 oC, concentrations were found to range from 26 to 199 ng g?1 for BPA, and from 95 to 30,000 ng g?1 for NP.