CONTAMINAÇÃO DA ÁGUA SUBTERRÂNEA E DO SOLO POR HIDROCARBONETOS ORIUNDOS DE POSTOS DE SERVIÇOS DE BRASÍLIA, DISTRITO FEDERAL, BRASIL

Abstract

The research aimed at quantifying hydrocarbons on land at gas stations located in the Brazilian Cerrado, more specifically in Brasilia, Federal District, by conducting Detailed Environmental Liability Investigations. For this purpose, 83 surveys were carried out in ten establishments (P-1 to P-10) aiming to delimit plumes of contamination in free phase, sorbed and dissolved. In total, 117 groundwater and 83 soil samples were analysed for the parameters benzene, toluene, ethylbenzene and xylenes (BTEX) and polycyclic aromatic hydrocarbons (PAH). The results showed no environmental contamination by PAH, however, in 80% of the establishments BTEX was identified in groundwater and soil, the highest concentrations of which were 2.653.00 μg.L^-1 (B; P-8), 14,744.00 μg.L^-1 (T; P-7), 3,820.00 μg.L^-1 (E; P-5), 29,650.00 μg.L^-1 (X; P-5) for subsurface water, and 1.18 mg.Kg^-1 (B; P-5) and 112.76 mg.Kg^-1 (X; P-7) for soil. Actions aimed at human and environmental protection on contaminated land are necessary, which should be done based on the next steps of the GAC Methodology.