title: Quantitative Determination of Fluorine Content in Blends of Polylactide (PLA)-Talc Using Near Infrared Spectroscopy.
abstract: Near-infrared spectroscopy (NIRS) has been widely used for quantitative and/or qualitative determination of a wide range of matrices. The objective of this study was to develop a NIRS method for the quantitative determination of fluorine content in polylactide (PLA)-talc blends. A blending profile was obtained by mixing different amounts of PLA granules and talc powder. The calibration model was built correlating wet chemical data (alkali digestion method) and NIR spectra. Using FT (Fourier Transform)-NIR technique, a Partial Least Squares (PLS) regression model was set-up, in a concentration interval of 0 ppm of pure PLA to 800 ppm of pure talc. Fluorine content prediction (R²cal = 0.9498; standard error of calibration, SEC = 34.77; standard error of cross-validation, SECV = 46.94) was then externally validated by means of a further 15 independent samples (R²EX.V = 0.8955; root mean standard error of prediction, RMSEP = 61.08). A positive relationship between an inorganic component as fluorine and NIR signal has been evidenced, and used to obtain quantitative analytical information from the spectra.
authors.affiliation: Department of Life Science and Biotechnology, University of Ferrara, Via L. Borsari, Ferrara 46 | 44121, Italy. tme@unife.it.
authors.forename: Elena
authors.initials: E
authors.lastname: Tamburini
authors.affiliation: Lab Control Srl, Chemical Analysis and Technological Services, Via Cà Donà, San Martino di Venezze, Rovigo 545 | 45030, Italy. chiara.tagliati@student.unife.it.
authors.forename: Chiara
authors.initials: C
authors.lastname: Tagliati
authors.affiliation: Lab Control Srl, Chemical Analysis and Technological Services, Via Cà Donà, San Martino di Venezze, Rovigo 545 | 45030, Italy. ambiente@lab-control.it.
authors.forename: Tiziano
authors.initials: T
authors.lastname: Bonato
authors.affiliation: Department of Life Science and Biotechnology, University of Ferrara, Via L. Borsari, Ferrara 46 | 44121, Italy. stefania.costa@unife.it.
authors.forename: Stefania
authors.initials: S
authors.lastname: Costa
authors.affiliation: Department of Life Science and Biotechnology, University of Ferrara, Via L. Borsari, Ferrara 46 | 44121, Italy. scc@unife.it.
authors.forename: Chiara
authors.initials: C
authors.lastname: Scapoli
authors.affiliation: Department of Life Science and Biotechnology, University of Ferrara, Via L. Borsari, Ferrara 46 | 44121, Italy. pdp@unife.it.
authors.forename: Paola
authors.initials: P
authors.lastname: Pedrini
keywords: PLA; blends; fluorine; near infrared spectroscopy; polylactide; quantitative calibration; talc