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In this study an inexpensive near infrared light emitting diodes (NIR LEDs) photometer using a webcam as a transmittance detector is proposed for the first time. As an illustrative application, the proposed NIR LED Webcam (NLW) photometer was used to detect adulterations of hydrated ethyl alcohol fuel (HEAF) by water or methanol. The proposed photometer used seven NIR LEDs in peak wavelengths of 805,...
In this work, it is proposed the one-voltammogram simultaneous determination of methanol and ethanol in hydrated ethyl alcohol fuel (HEAF) samples by cyclic voltammetry and multivariate calibration. To perform the determination, different multivariate calibration approaches were tested namely partial least-squares regression (PLS) and multivariate linear regression (MLR). To minimize collinearity...
In this study, a novel, simple, and efficient spectrofluorimetric method to determine directly and simultaneously five phenolic compounds (hydroquinone, resorcinol, phenol, m-cresol and p-cresol) in air samples is presented. For this purpose, variable selection by the successive projections algorithm (SPA) is used in order to obtain simple multiple linear regression (MLR) models based on a small subset...
This paper proposes an analytical method to determine directly and simultaneously five phenolic compounds (4-nitrophenol, 2-nitrophenol, phenol, 2,4,6-trichlorophenol and 4-chlorophenol) in sea water (Ria de Bahía Blanca, Argentine). The advantages of this method is that only requires spectrophotometric measurements (separation steps and derivatization reagents are avoided) and chemometric modelling...
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