engine performance [3]. The presence of inorganic species in alcohol can be a product of the corrosion of the equipments used in process of production, transport and storage of fuel or contamination of the sugarcane. The monitoring of these species is of concern, because they can induce the corrosion of vehicular components,reducing the machinery performance [4]. Besides, they can also promote the ‘‘poisoning’’ of catalysts in industrial processes, such
as in the production of ethylene from ethanol.