Data for: Elucidating the sources and dynamics of PM10 aerosols in Cienfuegos (Cuba) using their multi-stable and radioactive isotope and ion compositions

Published: 21-05-2020| Version 2 | DOI: 10.17632/fh3nf99wxn.2
Contributors:
Yasser Morera-Gómez,
Carlos Alonso Hernandez,
Jesús Miguel Santamaría,
David Elustondo,
Esther Lasheras,
Marjorie Bagur,
David Widory

Description

PM10 samples were collected during 2015 and 2016 on pre-combusted (4 hours at 550 ºC) quartz fiber filters (Munktell, 150 mm diameter) using high-volume samplers (MCV-CAV) operating at a flow rate of 30 m3h−1 at several sites in the coastal region of Cienfuegos, Cuba. A total of 38 samples were simultaneously collected at an urban (noted US, 21 samples) and a rural (noted RS, 17 samples) site during 48h every 15 days between February 2015 and January 2016. Due to technical issues with the high-volume samplers some samples were unfortunately not collected, discontinuing our time series. In addition, a total of 40 samples were collected during a monitoring survey (24h-PM10 samples every 2 days) carried out at a traffic (noted TS, 14 samples), a residential (noted ES, 14 samples) and an industrial-suburban (noted IS, 12 samples) sites during February, March and April 2016, respectively. Ammonium (NH4+) and major anions (Cl-, NO3- and SO42-) were analyzed by Ion Chromatography (Dionex ICS 1100 for ammonium and Dionex ICS 2000 for anions) in the soluble fraction using a quarter of each filter from the TS, ES and IS sampling sites. The pH and electric conductivity (EC) were also analyzed in the soluble fraction of these samples. Total carbon (TC), total nitrogen (TN) and their corresponding stable isotope compositions (δ13C and δ15N) were determined in samples collected at TS, ES and IS sampling sites using an Elemental Analyzer (EA, Vario MICRO Cube, Elementar, Hanau, Germany) coupled to an Isotope Ratio Mass Spectrometer (IRMS, IsoPrime 100, Cheadle, UK) operating in continuous flow mode. The inorganic carbon fraction (carbonate) was not removed prior to the isotope analysis. For the δ13C analysis a 1.3 cm2 piece punched from each PM10 quartz filter was packed into a tin capsule and analyzed by EA-IRMS. For the δ15N analysis, we adapted the method by gathering several smallest punches that reached a total area of 3.0 cm2 that we also packed into a tin capsule, and adding tungsten oxide (WO3) as a catalyst to achieve complete combustion. Isotope compositions were expressed using the regular δ13C and δ15N notations, which represent the relative difference expressed in per mil (‰) between the isotope ratio measured in the sample and that of an international standard (Pee Dee Belemnite (PDB) for carbon and atmospheric N2 for nitrogen). The 210Pb, 7Be, 137Cs and 40K activity concentrations (in mBq m-3) were measured directly in the PM10 samples from the US and RS sampling site using a low-level gamma spectrometric system with an HPGe well detector.

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