Volcanic ashes as a source for nitrated and oxygenated polycyclic aromatic hydrocarbon pollution
2020
Guiñez, María | Escudero, Luis | Mandelli, Alejandro | Martinez, Luis D. | Cerutti, Soledad
In this study, a novel, simple, and highly sensitive analytical procedure for the quantitative evaluation of oxygenated and nitrated polycyclic aromatic hydrocarbons in volcanic ash samples based on dispersive solid–liquid microextraction (DSLME) coupled to ultra high-performance liquid chromatography–tandem mass spectrometry (UHPLC-MS/MS) was developed. Diverse chemometric tools were applied to optimize DSLME working conditions. Thus, a linear calibration curve for all the target analytes in the concentration range from 0.01 to 100 μg g⁻¹ (r² > 0.994) was obtained. The limits of detection for all the compounds were between 14.6 and 56.0 pg g⁻¹, with high reproducibility (relative standard deviation (RSD) was below 8.1% for all the analytes). Additionally, recoveries ranged from 94.2 to 100%. The applicability of the method was evaluated and the feasibility of the existence of nitrated and oxygenated-PAHs in volcanic ashes at ultra-trace levels was demonstrated, which reveals an unknown source of distribution of these pollutants to the environment. Graphical Abstract
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