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Rapid extraction method of polycyclic aromatic compounds in soil using basic silica selective pressurized liquid extraction
Örebro University, School of Science and Technology. (Man-Technology-Environment (MTM) Research Centre)ORCID iD: 0000-0003-1404-3186
Örebro University, School of Science and Technology. (Man-Technology-Environment (MTM) Research Centre)ORCID iD: 0000-0003-2392-0515
Örebro University, School of Science and Technology. (Man-Technology-Environment (MTM) Research Centre)ORCID iD: 0000-0003-1404-3186
2020 (English)In: Journal of Chromatography A, ISSN 0021-9673, E-ISSN 1873-3778, Vol. 1618, article id 460896Article in journal (Refereed) Published
Abstract [en]

Complex chemical mixtures found in soils at contaminated sites typically includes polycyclic aromatic compounds (PACs), thus posing potential environmental and human health risks. Pressurized liquid extraction (PLE) followed by silica clean-up is one of the most often used extraction methods for PACs in soil. While silica clean-up provide satisfactory recovery of oxygenated polycyclic aromatic hydrocarbons (OPAHs), this technique provides limited recovery of azaarenes. In this work, we used PLE and in-cell clean up with basic silica to increase the recovery of OPAHs and azaarenes. The optimized selective pressurized liquid extraction (SPLE) method used 4 g basic silica, dichloromethane, 100% flush volume, 100 and 120 °C extraction temperatures, with two static cycles for each temperature, no rinse in between the two extractions, and 20 and 120 s purge for the first and second extraction temperature, respectively. The method was validated for a wide range of PAC groups, including OPAHs, azaarenes, alkylated PAHs, and sulfur heterocycles (SPACs), in total 87 PACs, using certified reference material and in comparison to the results from previous inter-laboratory data. Our SPLE method yielded results that are in agreement with certified values and inter-laboratory data from prior analysis. The SPLE method also yielded lower variation than the results from the inter-laboratory data for analysis of OPAH and azaarenes, suggesting better precision than previous methods. More importantly, the SPLE method increases sample analysis throughput as extra clean-up step is not necessary anymore. The SPLE method was then successfully applied to rapidly screen PACs in three soil samples.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 1618, article id 460896
Keywords [en]
Selective pressurized liquid extraction (SPLE), Polycyclic aromatic compounds (PACs), Soil, Oxygenated PAHs (OPAHs), Azaarenes
National Category
Analytical Chemistry
Research subject
Chemistry
Identifiers
URN: urn:nbn:se:oru:diva-80713DOI: 10.1016/j.chroma.2020.460896ISI: 000528932300041PubMedID: 32005529Scopus ID: 2-s2.0-85078476432OAI: oai:DiVA.org:oru-80713DiVA, id: diva2:1415191
Funder
Knowledge Foundation, 20160019Available from: 2020-03-17 Created: 2020-03-17 Last updated: 2024-01-16Bibliographically approved

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Titaley, Ivan A.Eriksson, UlrikaLarsson, Maria

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