Abstract
Detergent–dispersant additized gasoline helps to keep engines clean, inhibits the formation of gum and sludge in the combustion process, and reduces the emissions of contaminants to the atmosphere. In this study, a new procedure using thermogravimetry (TG), derived thermogravimetry (DTG), and differential scanning calorimetry (DSC) was developed to identify the presence of four commercial detergent–dispersant additives used in gasoline in Brazil using sealed aluminum pans with small holes and pinholes and an inert ambient. It was found that when pinholes of the same diameter were used, it was possible to distinguish the additives more accurately. The thermal decomposition temperatures of the active components of each additive were mainly identified by TG and DTG. The results indicate that the active components of additives T and Y are similar, but that their content is slightly different. They can be rapidly and easily distinguished from additives W and G, which allows their quantification by size-exclusion chromatography in real samples of Brazilian gasoline to which they may have been added.
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