Central European Journal of Chemistry

Texto completo: acesso restrito. p. 1328-1337 Submitted by Edileide Reis (leyde-landy@hotmail.com) on 2014-07-29T15:19:18Z No. of bitstreams: 1 Iuri M. Pepe.pdf: 869413 bytes, checksum: 280ac9781b0d6cf55f17e9497c4e4218 (MD5) Made available in DSpace on 2014-07-29T15:19:18Z (GMT). No. of bitstreams: 1 Iuri M. Pepe.pdf: 869413 bytes, checksum: 280ac9781b0d6cf55f17e9497c4e4218 (MD5) Previous issue date: 2012 Regressions based on fluorescence spectroscopy were developed to provide relatively inexpensive and rapid measurements of the concentration, viscosity, and specific gravity of biodiesel-diesel blends. The methods involved obtaining a mathematical model from spectrofluorimetric data and data from a given property (concentration, dynamic viscosity, or specific gravity) using partial least squares (PLS) regression, which was then applied as a model for predicting properties of interest. The predicted concentrations, dynamic viscosities, and specific gravities of the biodiesel-diesel blends were compared with actual values and agreed reasonably well with the obtained results. The models showed high correlation between real and predicted values. The R-square values near 1 indicated excellent model accuracy for predicting concentrations, specific gravities, and dynamic viscosities of biodiesel-diesel blends. The residual distribution did not follow a trend with respect to the predicted variables, indicating an excellent fit to the data.