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Contributo in atti di convegno
Tipo: Abstract in atti di convegno
Titolo: REE patterns in PM10 collected in the Arctic region
Anno di pubblicazione: 2015
Autori: R. Salzano, S. Becagli, A. di Sarra, F. Giardi, R. Traversi, R. Salvatori, M. Severi and R. Udisti
Affiliazioni autori: Institute of Atmospheric Pollution Research, National Research Council of Italy, Sesto Fiorentino, 50019, Italy Department of Chemistry, University of Florence, Sesto Fiorentino, 50019, Italy ENEA, Laboratory for Earth Observations and Analyses, Rome, 00123, Italy.
Abstract: The source apportionment of particulate matter in polar regions is a critical issue for the discrimination of long range transport contributes in the atmosphere (Seinfeld & Pandis 2006). The advancements in analytical techniques offer the opportunity to include new geochemical markers in transport models such as Rare Earth Elements (REE). REEs are lanthanides that have been traditionally used as tracers for a variety of geochemical processes in hydrosphere and lithosphere due to their very distinctive geochemical properties (McLennan 2001). The possibility to determine such elements at very low concentration, as in particulate matter sampled in polar regions, is an important innovation for this kind of studies. The present work introduces the first attempt to determine REEs in polar regions, obtained sampling PM10 at Ny Alesund (Svalbard Islands, Norway, 78.9°N, 11.9°E) and at Thule (Greenland, 6.5°N, 68.8°W) from spring 2010 to winter 2011. Teflon filters were collected using TECORA Skypost samplers over 24 - 48 hours time resolution. The determinations were performed digesting the samples in microwave oven at 220°C for 25min with a sub-boiled distilled HNO3 and H2O2 suprapure solution. The concentrations of heavy metals and REEs were determined by using a HR-ICP-MS Element2 Thermo-Fisher equipped by APEX desolvatation system and ACM module (able to reduce the oxide interferences) as sample introduction system. The obtained results were included in a large database that included the local outcropping rocks of Svalbard Islands and Greenland, the signature of oil combustion by-product, the composition of worldwide ores and the signature of some potential resuspended materials (seawater salts, ice, snow and loess). The REEs patterns at Thule during spring and summer periods showed that particulate matter is enriched in light REEs (from La to Sm) compared to fall and winter. While the LREE/HREE at Thule between summer and spring is pretty similar, at Ny Alesund during summer is lower than spring. From a general point of view Ny Alesund aerosols are enriched in REEs compared to Thule. All these features can be explained by invoking a higher local crustal contribute during the melting season instead of a more important long range transport of anthropic components the rest of the year. The association between local rocks and particulate matter is supported by the comparison between the different potential rock sources and the observed REE patterns of PM10. The same approach can support the relationship between anthropic components and potential source regions.
Stato della pubblicazione: Published version
Congresso nome: European Aerosol Conference 2015
Congresso luogo: Milano
Congresso data: 06-11/11/2015
Congresso rilevanza: Internazionale
Congresso relazione: Contributo
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