ANGELICA PRETTO
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Artigo IPEN-doc 25054 Determining VOCs reactivity for ozone forming potential in the megacity of São Paulo2018 - ALVIM, DEBORA S.; GATTI, LUCIANA V.; CORREA, SERGIO M.; CHIQUETTO, JULIO B.; SANTOS, GUACIARA M.; ROSSATTI, CARLOS de S.; PRETTO, ANGELICA; ROZANTE, JOSE R.; FIGUEROA, SILVIO N.; PENDHARKAR, JAYANT; NOBRE, PAULOHigh ozone (O-3) concentrations are a major concern about air quality in the Sao Paulo Metropolitan Area (SPMA). During 2016, the 8-hour state standard of 140 mu g m(-3) was exceeded on 32 days, whereas the 1-hour national standard of 160 mu g m(-3) was exceeded on 76 days. Exposure to such unhealthy O-3 levels and other pollutants can lead to respiratory disease. The focus of this study is to determine the main O-3 precursor in terms of the volatile organic compounds (VOCs) in order to provide a scientific basis for controlling this pollutant. In this work, 66 samples of hydrocarbons, 62 of aldehydes and 42 of ethanol were taken during the period from September 2011 to August 2012 from 7:00 to 9:00 a.m. The OZIPR trajectory model and SAPRC atmospheric chemical mechanism were used to determine the major O-3 precursors. During the studied period, aldehydes represented 35.3% of the VOCs, followed by ethanol (22.6%), aromatic compounds (15.7%), alkanes (13.5%), ketones (6.8%), alkenes (6.0%) and alkadienes (less than 0.1%). Considering the concentration of VOCs and their typical reactivity, the simulation results showed that acetaldehyde contributed 61.2% of the O-3 formation. The total aldehydes contributed 74%, followed by aromatics (14.5%), alkenes (10.2%), alkanes (1.3%) and alkadienes (e.g., isoprene; 0.03%). Simulation results for the SPMA showed that the most effective alternative for limiting the O-3 levels was reducing the VOC emissions, mainly the aldehydes.Artigo IPEN-doc 23026 Main ozone-forming VOCs in the city of Sao Paulo: observations, modelling and impacts2017 - ALVIM, DEBORA S.; GATTI, LUCIANA V.; CORREA, SERGIO M.; CHIQUETTO, JULIO B.; ROSSATTI, CARLOS de S.; PRETTO, ANGELICA; SANTOS, MARIA H. dos; YAMAZAKI, AMELIA; ORLANDO, JOAO P.; SANTOS, GUACIARA M.High-ozone concentrations currently represent the main air pollution problem in the city of São Paulo, Brazil. To elucidate the main volatile organic compounds (VOCs), which act as ozone precursors, samples from air quality monitoring stations were evaluated. Thirty-five samples were collected in August–September of 2006 and 43 in July–August of 2008, when the consumption of ethanol was about 50%of the total fuel used in the São Paulo Metropolitan Area. Samples were collected using electropolished stainless canisters. Chemical analyses were performed on pre-concentrated samples followed by gas chromatograph with flame ionization and mass spectrometry detection. The incremental reactivity scale was used to rank the ozone precursors using the Ozone Isopleth Package for Research (OZIPR) trajectory model coupled with chemical mechanism Statewide Air Pollution Research Center (SAPRC). Sixty-nine species of VOCs were quantified, and the ten main ozone precursors identified in 2008 were as follows: formaldehyde (42.8 %), acetaldehyde (13.9 %) , ethene (12.2 %) , propene (5.1 %), 1- methylcyclopentene (3.0 %), p-xylene (2.4 %), 1-butene (2.1 %), trans-2-pentene (1.9 %), 2-methyl 2-butene (1.7 %) and trans-2-butene (1.6 %). Volatile organic compound mass distribution showed that in 2008 alkanes represented 46 % of the total VOCs, alkenes 27 %, aromatics 14 %, alkadienes 1% and aldehydes 12 %.Artigo IPEN-doc 23883 Analysis of the influence of co2 concentration and others external factors on the N2O quantification2013 - PRETTO, A.; IZIDORO, J.C.; GATTI, L.V.; CORREIA, C.S.C.; MARTINEWSKI, A.; BASSO, L.S.; BORGES, V.F.; ROSSATI, C.; MILLER, J.B.; CROTWELL, A.; TANS, P.Artigo IPEN-doc 20248 Compostos orgânicos voláteis principais precursores de ozônio na cidade de São Paulo2014 - ALVIM, DEBORA S.; GATTI, LUCIANA V.; CORREA, SERGIO M.; PRETTO, ANGELICA; ROSSATTI, CARLOS de S.; ORLANDO, JOAO P.Tese IPEN-doc 10427 Artigo IPEN-doc 14199 Emission factors for gas-powered vehicles traveling through road tunnels in Sao Paulo, Brazil2006 - MARTINS, LEILA D.; ANDRADE, MARIA F.; FREITAS, EDMILSON D.; PRETTO, ANGELICA; GATTI, LUCIANA V.; ALBUQUERQUE, EDLER L.; TOMAZ, EDSON; GUARDANI, MARIA L.; MARTINS, MARIA H.R.B.; JUNIOR, OLIMPIO M.A.