01481nab a2200205 4500 20260520000816.0 260224s2009 xxu Study of brazilian gasoline quality using hydrogen nuclear magnetic resonance (1H NMR) spectroscopy and chemometrics ene. 2009 15/05/2009 ; 15/04/2009 7 p. ; 272-279 Transcripción del resúmen publicado por el autor: The identification of gasoline adulteration by organic solvents is not an easy task, because compounds that constitute the solvents are already in gasoline composition. In this work, the use of hydrogen nuclear magnetic resonance (1H NMR) with a statistical approach for identifying gasoline adulteration by organic solvents is described. Both principal component analysis (PCA) and hierarchical cluster analysis (HCA) from NMR data of 47 commercial samples allowed the distinction between conform and nonconform samples. The 1H NMR-PCA and 1H NMR-HCA models were evaluated through the analyses of 21 intentionally adulterated samples, which showed a tendency to meet in the nonconform group with the increase of the solvent concentration. Energy & fuels 23 ARTICULO Monteiro, Marcos R. 40890 Ambrozin, Alessandra R.P. 40891 Liao, Luciano M. 40892 169566 169566 http://pubs.acs.org/doi/full/10.1021/ef800436p 0 0 0 0 237385 BVIAPG BVIAPG 2026-03-05 200044368 0 200044368 2026-03-05 15:11:46 2026-03-05 ARTICULO