Hopanoid hydrocarbons in PM10 from road tunnels in So Paulo, Brazil

Autor(es)

Alves, Celia A. ^[1] ; Vicente, Ana M. ^[1] ; Rocha, Sonia ^[1] ; Vasconcellos, Perola ^[2]

Afiliação do(s) autor(es)

^[1] Univ Aveiro, Dept Environm, Ctr Environm & Marine Studies, P-3810193 Aveiro - Portugal

^[2] Univ Sao Paulo, Chem Inst, Cidade Univ, BR-05508900 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: AIR QUALITY ATMOSPHERE AND HEALTH; v. 10, n. 7, p. 799-807, SEP 2017.
• Citações Web of Science: 3

Resumo

The fleet of flexible fuel vehicles in Brazil is the largest in the world. To diagnose the contribution of vehicle emissions to atmospheric particulate matter, organic molecular markers, such as hopanes, can be used. However, nothing is known about the particulate matter mass fractions of these tracers in environments exclusively impacted by road emissions. In this study, the hopanoid composition of PM10 inside two tunnels in the So Paulo metropolitan area with very distinct circulating fleets (JA cent nio Quadros (JQ) and Rodoanel (RA)) was obtained. Higher mean concentrations (82.4 ng m(-3)) and PM10 mass fractions (239 ng mg(-1)) were obtained in RA, in which the fleet is composed of both light and heavy duty vehicles. The most abundant species were 17 alpha(H),21 beta(H)-30-norhopane (27.9 ng mg(-1) in JQ, 47.9 ng mg(-1) in RA) and 17 alpha(H),21 beta(H)-hopane (32.6 ng mg(-1) in JQ, 44.3 ng mg(-1) in RA). Diverse concentration ratios were calculated and compared with those of other sources. Overlapping values may preclude the use of these parameters as source assignment tools. Some compounds, such as 18 alpha(H)-22,29,30-trisnorneohopane, 17 alpha(H)-22,29,30-trisnorhopane, 17 alpha(H),21 beta(H)-30-norhopane, 18 alpha(H)-30-norneohopane, 17 alpha(H),21 beta(H)-hopane, 17 alpha(H),21 beta(H)-22S-homohopane and 17 alpha(H),21 beta(H)-22R-homohopane, were found to be very good predictors of the total concentrations of hopanoids. (AU)

• 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