Medidas de Impedância Elétrica e Análise Estatística de três variedades de Petróleos Brasileiros

Electrical responses of three samples of Brazilian oil of the same farm field were analyzed by means of Electrical Impedance Spectroscopy. For each sample, duplicates with different heptane/oil ratios were analyzed and subsequently separated into two groups. Results were assessed througn the Paired t Test, Hierarchical Cluster Analysis and Principal Component Analysis. In samples B and C, a transition band was detected, due to the petroleum’s electric behavior change. This transition may be related to changes in the asphaltene micelles.