Artículo de revista
Deltamethrin determination in natural water samples via photochemically-induced fluorescence coupled to third-order multivariate calibration
Fecha
2020Registro en:
Microchemical Journal 159 (2020) 105561
10.1016/j.microc.2020.105561
Autor
Veneciano, Rodrigo I.
Parra, V. Sonnia
Quiroz, Waldo
Fuentes Pérez, Edwar
Aguilar, Luis F.
Bravo, Manuel A.
Institución
Resumen
In this work, an analytical method for deltamethrin determination in natural waters based on photochemicallyinduced fluorescence coupled to third-order/four-way calibration was evaluated and compared with secondorder/three-way calibration. The four-way data were obtained during the photodegradation of deltamethrin in the form of excitation-emission fluorescence matrices and modelled by unfolded partial least squares coupled to residual trilinearization (U-PLS-RTL). According to the results, the third-order model resulted in a satisfactory fit and better figures of merit, even in the presence of unexpected interferences due to the additional dimension. In this way, the method presents a limit of detection of 2.9 mu g L-1 and a relative error of prediction of 15.8%. The optimization of a dispersive liquid-liquid microextraction (DLLME) procedure reached an enrichment factor (EF) of 5, improving the detection and quantification limits. Finally, the analytical method based on third-order multivariate calibration was applied to quantify this analyte in spiked natural water samples, both directly and after preconcentration. In all cases, the third-order property allowed us to satisfactorily model the data and quantify this compound in these complex matrices, demonstrating the superior analytical performance of the high-order data evaluated.