Avaliação da qualidade de pescados do litoral pernambucano impactados pelo derramamento de óleo de 2019: aplicando-se técnicas electrometrias de massa por abundância e de razões isotópicas

Abstract

In August 2019, large slicks of crude oil were detected that reached the coast of 11 states in the northeast and southeast of Brazil. Two years after this oil spill, samples of fish belonging to the Ariidae and Lutjanidae families were collected, as they are of great economic interest in the Brazilian Northeast region. Analyzes of 13C e 15N isotopic signals (via EA-IRMS) and concentrations of Ni and V trace elements (via ICP- MS) were performed and left with data reported in the literature on oil residues and biota impacted by oil spills and/or with intense anthropic activity. Data on the isotopic ratios of carbon in the specimens acquired had their means varying between -17.20 ‰ and -13.19 ‰, while in the literature crude oil and its derivatives presented 13C varying between -30.00 ‰ and -26 ,50 ‰. The mean concentrations of nickel and vanadium found in individuals of the Ariidae family ranged from 0.04 mg/kg – 0.11 mg/kg and 0.05 mg/kg – 0.08 mg/kg respectively, while for members of the family Lutjanidae these same average concentrations varied between 0.01 mg/kg – 0.04 mg/kg and 0.05 mg/kg – 0.06 mg/kg of wet mass, respectively. It was concluded that, in the presence of remaining contamination, the oil did not influence the isotopic signal of the collected samples or that these organisms were no longer exposed to these substances. It was also concluded, based on the literature, that the concentration intervals of Ni and V were the lowest mentioned in the studies or intersect close to their minimum values, suggesting that the values found on the coast of the Northeast region are reflecting pre-existing proportionate experiences in the environment and not concentrated features of locations impacted by oil spills.