Abstract
This study aimed to present the chemical composition of samples of type C gasoline sold in gas stations in the Metropolitan Region of Rio de Janeiro, Brazil. The composition of benzene, toluene and xylene (BTX) were determined by infrared absorption. The results were compared with the specification limits given by the Petroleum, natural gas and biofuel Natioonal Agency, (ANP, No. 309), which specifies a maximum of 1% by volume for benzene, the levels of toluene and xylene are not specified by this agent regulator. The results showed that gasoline sold in some gas stations had benzene levels above the specified limit. In the total levels of toluene, xylene and benzene for samples of gasoline station without a flag were respectively: 2.1 Vol%, 3.4% Vol and 1.0 Vol%. As for the samples of petrol stations with the flag, the average was 2.4% Vol for toluene, 4.0% Vol for xylene and 1.1 Vol% for benzene, indicating a level of action by ANP mainly by the toxic action of benzene.
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