Chemical speciation and source apportionment of fine particulate matter in Santiago, Chile, 2013

Zotero

Author

Ana M. Villalobos
Francisco Barraza
Héctor Jorquera
James J. Schauer

Tipo de elemento

Journal Article

DOI

10.1016/j.scitotenv.2015.01.006

ISSN

0048-9697

Abstract Note

Santiago is one of the largest cities in South America and has experienced high fine particulate matter (PM2.5) concentrations in fall and winter months for decades. To better understand the sources of fall and wintertime pollution in Santiago, PM2.5 samples were collected for 24 h every weekday from March to October 2013 for chemical analysis. Samples were analyzed for mass, elemental carbon (EC), organic carbon (OC), water soluble organic carbon (WSOC), water soluble nitrogen (WSTN), secondary inorganic ions, and particle-phase organic tracers for source apportionment. Selected samples were analyzed as monthly composites for organic tracers. PM2.5 concentrations were considerably higher in the coldest months (June–July), averaging (mean ± standard deviation) 62 ± 15 μg/m3 in these two months. Average fine particle mass concentration during the study period was 40 ± 20 μg/m3. Organic matter during the peak winter months was the major component of fine particles comprising around 70% of the particle mass. Source contributions to OC were calculated using organic molecular markers and a chemical mass balance (CMB) receptor model. The four combustion sources identified were wood smoke, diesel engine emission, gasoline vehicles, and natural gas. Wood smoke was the predominant source of OC, accounting for 58 ± 42% of OC in fall and winter. Wood smoke and nitrate were the major contributors to PM2.5. In fall and winter, wood smoke accounted for 9.8 ± 7.1 μg/m3 (21 ± 15%) and nitrate accounted for 9.1 ± 4.8 μg/m3 (20 ± 10%) of fine PM. The sum of secondary inorganic ions (sulfate, nitrate, and ammonium) represented about 30% of PM2.5 mass. Secondary organic aerosols contributed only in warm months, accounting for about 30% of fine PM during this time.

Access Date

2015-12-29 00:42:27

Fecha

April 15, 2015

Journal Abbreviation

Science of The Total Environment

Library Catalog

ScienceDirect

Páginas

133-142

Publication Title

Science of The Total Environment

Título

Chemical speciation and source apportionment of fine particulate matter in Santiago, Chile, 2013

URL

http://www.sciencedirect.com/science/article/pii/S0048969715000091

Volume

512–513

Attachment Title

ScienceDirect Snapshot

Attachment URL

[No URL]

Archivos

Citación

Ana M. Villalobos et al., “Chemical speciation and source apportionment of fine particulate matter in Santiago, Chile, 2013,” Omeka para Cedeus, consulta 28 de noviembre de 2020, http://pubs.cedeus.cl/omeka/document/55.

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