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

Autor(es)

Caumo, Sofia ^[1] ; Bruns, Roy E. ^[2] ; Vasconcellos, Perola C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim, BR-05508000 Sao Paulo - Brazil

^[2] Univ Estadual Campinas, Inst Quim, BR-13083861 Campinas - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ATMOSPHERE; v. 11, n. 6 JUN 2020.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 16/23339-1 - Caracterização molecular e ocorrência de compostos orgânicos na fase gasosa e particulada do material atmosférico coletado no Pólo Petroquímico de Capuava (SP)
• Beneficiário: Sofia Ellen Caumo Miranda
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 08/58104-8 - Narrowing the uncertainties on aerosol and climate changes in São Paulo State: NUANCES-SPS
• Beneficiário: Maria de Fátima Andrade
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático