NIR Associado à Quimiometria

Uma Poderosa Ferramenta Analítica

Abstract

Near infrared (NIR) is a modality of vibrational spectroscopy with relatively high energy in which molecules containing, mainly, the functional groups C–H, N–H, O–H and S–H are analyzed, and can be used in analyzes qualitative and quantitative. Analytical methods resulting from the use of NIR reflect its most significant characteristics, such as fast (one minute or less per sample), non-destructive, non-invasive, with high penetration into the probing radiation beam, suitable for on-line use, nearly universal and with minimal sample preparation demands. Despite these advantages, the use of NIR only became widespread through the development of computing and the discipline of chemometrics. Chemometrics involves the application of statistical and mathematical methods, as well as those based on mathematical logic, to
chemical analysis, providing the tools for gathering information and its rational use. Thus, the scope of this work is to present the main aspects of NIR and chemometrics, whose association is essential when the purpose is to use NIR in quantitative analyses.