Resumen

GAMBOA, Adriana  y  ALVAREZ, Carlos. Geochemical characterization of atmospheric settled particles collected at service stations in Cumana city, northeastern Venezuela. RCTU [online]. 2018, vol.5, n.1, pp.57-62. ISSN 1390-7697.  https://doi.org/10.26423/rctu.v5i1.315.

Services stations can provide contaminants into the air, soils, and waterbodies. In order to analyze Fe, Pb, Cd, Ni residual and bioavailable content, and organic fraction (OF) associated to atmospheric settled particles, samples were taken in three service stations of Cumaná city (northeastern Venezuela), considering three sampling sites (1) entry; (2) petrol pump, and exit, for three weeks. The metals bioavailable fraction analyses consisted in stir the samples at lab temperature with acetic acid for 5 hours. The residue was treated at 80 ° C with HNO3-HCl (3: 1), to obtain the residual fraction. The concentration of metals was determined by atomic absorption spectroscopy and organic fraction by Soxhlet extraction. At the petrol pump, more metals were accumulated, which implies that it is an ideal place to carry out impact studies of service stations as fixed sources of pollutants. There were significant differences (p <0,05) in the medians of Fe (bio), Pb (res) and OF according to the sampling sites, and the services stations: Which allows to infer possible differences in emission sources and accumulation conditions. The positive correlation between Fe (bio) with Ni (bio) and OF; and of Fe (res) with Pb (res), indicates the association of the species according to the emission sources.

Palabras clave : Heavy metals,; Atmospheric Particles; Bioavailability; Organic fraction,; Service stations.

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