Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Variation of the Distribution of Atmosphericn-Alkanes Emitted by Different Fuels' Combustion

Full text
Author(s):
Caumo, Sofia [1] ; Bruns, Roy E. [2] ; Vasconcellos, Perola C. [1]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Inst Quim, BR-05508000 Sao Paulo - Brazil
[2] Univ Estadual Campinas, Inst Quim, BR-13083861 Campinas - Brazil
Total Affiliations: 2
Document type: Journal article
Source: ATMOSPHERE; v. 11, n. 6 JUN 2020.
Web of Science Citations: 0
Abstract

This study presents the emission profiles ofn-alkanes for different vehicular sources in two Brazilian cities. Atmospheric particulate matter was collected in Sao Paulo (Southeast) and in Salvador (Northeast) to determinen-alkanes. The sites were impacted by bus emissions and heavy and light-duty vehicles. The objective of the present study is to attempt to differentiate the profile ofn-alkane emissions for particulate matter (PM) collected at different sites. PM concentrations ranged between 73 and 488 mu g m(-3), and the highest concentration corresponded to a tunnel for light and heavy duty vehicles. At sites where diesel-fueled vehicles are dominant, then-alkanes show a unimodal distribution, which is different from the bimodal profile observed in the literature. Carbon preference index values corresponded to anthropogenic sources for most of the sites, as expected, but C(max)varied comparing to literature and a source signature was difficult to observe. The main sources to air pollution were indicated by principal component analysis (PCA). For PCA, a receptor model often used as an exploratory tool to identify the major sources of air pollutant emissions, the principal factors were attributed to mixed sources and to bus emissions. Chromatograms of four specific samples showed distinct profiles of unresolved complex mixtures (UCM), indicating different contributions of contamination from petroleum or fossil fuel residues, which are unable to resolve by gas chromatography. The UCM area seemed higher in samples collected at sites with the abundance of heavy vehicles. (AU)

FAPESP's process: 16/23339-1 - Molecular characterization and occurrence of organic compounds in gaseous and particulate phase in atmospheric particulate matter collected in Petrochemical Industry of Capuava (SP)
Grantee:Sofia Ellen Caumo Miranda
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 08/58104-8 - Narrowing the uncertainties on aerosol and climate changes in São Paulo State: NUANCES-SPS
Grantee:Maria de Fátima Andrade
Support Opportunities: Research Program on Global Climate Change - Thematic Grants