Five gasoline samples from different gas stations around the Campus
of the Universidade Federal de Santa Catarina (UFSC, Florianópolis,
Brazil), prepared by dilution in ethanol, were analyzed in this work,
four were normal (gasoline without additives) and one special (containing
unknown additives that help cleaning the motor parts). The
samples, collected in amber glass bottles, were immediately taken to
the laboratory and analyzed in the same day. The two gasoline samples
used for the method optimization were named C (from common
gasoline), and the five samples used for the analytical application were
named G