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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:21 |
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Conference: Bucharest University Faculty of Physics 2022 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Preliminary analysis of morphologic and magnetic properties of aerosols at three sites in Romania
Authors:
Adriana Dumitru (1), Cristian Necula (1), Marius Dumitru (2) and Gabriela Iorga (1,3)
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Affiliation:
1)University of Bucharest, Faculty of Physics, Atomistilor 405, 077125 Bucharest-Magurele, Romania
2)National Institute for Laser, Plasma and Radiation Physics, Atoms Street 409, MÄgurele, 077125, Romania
3)University of Bucharest, Faculty of Chemistry, Regina Elisabeta 4-12, 030018 Bucharest, Romania
E-mail
adriana.dumitru1@gmail.com
Keywords:
ground-based PM10, aerosol magnetic properties, East Europe, FORC, non linear Preisach maps
Abstract:
This study is focused on morphology and the magnetic properties of PM10 aerosol samples collected at three different sites in southern Romania: Bucharest as urban, heavy impacted by traffic in the very center of the city, Magurele as suburban, under the influence of Bucharest and of the agricultural activities in the surrounding areas and Matasari, a rural site located in south-western Romania that is heavy impacted by the industrial activities at open-pit coal mines located in the proximity. Measurement campaigns were performed in different seasons between 2019 and 2022 using low-volume samplers. Sampling times varied from 12 to 72 hours, in order to assure the enough aerosol deposits on the quartz fiber filters for the magnetic properties analyses. Morphological and compositional samples properties were determined by scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDS) analysis. The magnetic properties were determined by using vibration magnetometer (VSM). This study shows first magnetic characterization (IRM aquisition curves, remanent and saturation magnetization, FORC and Preisach diagrams) of aerosol samples in Romania and identified both anthropogenic signatures as magnetit/maghemit in all samples and natural signature by aeolian hematite from desert dust in some of the samples. This work also shows that the use of the magnetic fingerprints coupled with morphology analysis as proxies to monitor the sources of ambient particulate matter represents a powerful method for identification of anthropogenic magnetic minerals and their domain states and interactions.
Acknowledgement:
AD and GI gratefully acknowledge the funding from the NO Grants 2014-2021, under contract no. 31/2020, EEA-RO-NO-2019-0423 project.
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