Development of a novel dispersive solid-liquid microextraction approach coupled to UHPLC-MS/MS detection for the determination of nitrated and oxygenated polycyclic aromatic hydrocarbons in volcanic ashes

? MARÍA GUIÑEZ; LUIS ESCUDERO; ALEJANDRO MANDELLI; LUIS D MARTINEZ; E. CERUTTI

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

SPRINGER HEIDELBERG

Lugar: HEIDELBERG; Año: 2020 vol. 27 p. 16972 - 16982

0944-1344

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.