Trindade Felipe C S, de Souza Sobrinha Izabel G, Pereira Goreti, Pereira Giovannia A L, Raimundo Ivo M, Pereira Claudete F
Universidade Federal de Pernambuco, Departamento de Química Fundamental, Recife, Pernambuco, Brazil 50740560.
Universidade Federal de Pernambuco, Departamento de Química Fundamental, Recife, Pernambuco, Brazil 50740560; Universidade de Aveiro, Departamento de Química & CESAM, Aveiro, Portugal 3810-193.
Spectrochim Acta A Mol Biomol Spectrosc. 2024 Dec 5;322:124867. doi: 10.1016/j.saa.2024.124867. Epub 2024 Jul 22.
A green, fast and effective multivariate method for the determination of atrazine (ATZ) was developed using conventional infrared equipment furnished with an attenuated total reflectance module (ATR-IR), providing limit of detection (LOD) and limit of quantification (LOQ) in the ranges from 1.9 to 4.6 µg/mL and from 5.6 to 14 µg/mL, respectively. Furthermore, the surface-enhanced infrared absorption (SEIRA) approach was investigated to improve the sensitivity of the measurements and detect ATZ at low concentrations, addressing the compatibility with reference methods. To this end, a substrate formed by silver selenide quantum dots stabilized with mercaptopropionic acid (AgSe/MPA), synthesized in aqueous medium by an one-pot synthesis, was used. The spectral data were investigated by univariate and multivariate calibrations, allowing to calculate the enhancement factor (EF) and the multivariate enhancement factor (MEF), respectively. The SEIRA strategy proved to be able to enhance the atrazine signal up to 86-fold, allowing the detection of ATZ at concentrations as low as 0.001 µg/mL.
