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Magic extraction: solid-phase extraction and analytical pyrolysis to study polycyclic aromatic hydrocarbon and polychlorinated biphenyls in freshwater
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A new solventless solid-phase extraction method was tested for extracting polycyclic aromatic hydrocarbons and polychlorinated biphenyls from freshwater samples. The Magic Chemisorber material selectively captured these persistent organic pollutants without the need for large volumes of organic solvents. This cleaner analytical technique reduces hazardous waste while maintaining good recovery of target contaminants.
Polycyclic aromatic hydrocarbons and polychlorinated biphenyls are commonly categorized as persistent organic pollutants. In order to analyze these pollutants, customized stationary phases are increasingly being developed and synthesized for solid-phase extraction. In this work, we tested a new solventless solid-phase extraction approach based on the use of a Magic Chemisorber® (Frontier Lab) which consists of a bead-covered polydimethylsiloxane stationary phase with a thickness of 500 µm. These devices are directly immersed into aqueous samples and then introduced into a pyrolysis-gas chromatography-mass spectrometry system equipped with a cryofocusing system for the thermal desorption and analysis of the adsorbed species. Our new method performs better than the most recent solid-phase extraction devices, with limits of detection lower than 2.7 ng/L and limits of quantification lower than 9.0 ng/L. The method was tested on standard compounds and on an environmental sample, showing the potential to characterize other chemical species besides the persistent organic pollutants, such as phthalate plasticizers and antioxidants.
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Analiza polikloriranih bifenilov adsorbiranih na plastičnih granulatih: primerjava ekstrakcijskih tehnik
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This thesis developed and compared four methods for extracting polychlorinated biphenyls (PCBs) from marine plastic resin pellets, finding that pressurized fluid extraction (PFE) offered the best efficiency and repeatability compared to Soxhlet, ultrasonication, and maceration approaches. The work provides a reliable protocol for measuring the toxic organic pollutants that plastic pellets accumulate in ocean environments.
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