Caracterização do MP10 e MP2,5 e distribuição por tamanho de cloreto, nitrato e sulfato em atmosfera urbana e rural de Londrina

Freitas, Adriana de M.; Solci, Maria Cristina

doi:10.1590/s0100-40422009000700013

Cited by 21 publications

(17 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…3. Seventy-six percent of PM 10 particles emitted were below 2.5 μm (PM 2.5 ), in agreement with the works from Freitas and Solci (2009), which were of 70%; and 30% of this PM 2.5 were below 0.25 μm, with a large fraction of soot, according to data provided by Sioutas equipment. This data agrees with measurements performed in a tunnel in the city of São Paulo (Sánchez-Ccoyllo et al 2009).…”

Section: Resultssupporting

confidence: 87%

Particle emission from heavy-duty engine fuelled with blended diesel and biodiesel

Martins

Júnior

Solci

et al. 2011

Environ Monit Assess

Self Cite

View full text Add to dashboard Cite

In this study, particulate matter (PM) were characterized from a place impacted by heavy-duty vehicles (Bus Station) fuelled with diesel/biodiesel fuel blend (B3) in the city of Londrina, Brazil. Sixteen priority polycyclic aromatic hydrocarbons (PAH) concentrations were analyzed in the samples by their association with atmospheric PM, mass size distributions and major ions (fluorite, chloride, bromide, nitrate, phosphate, sulfate, nitrite, oxalate; fumarate, formate, succinate and acetate; lithium, sodium, potassium, magnesium, calcium and ammonium). Results indicate that major ions represented 21.2% particulate matter mass. Nitrate, sulfate, and ammonium, respectively, presented the highest concentration levels, indicating that biodiesel may also be a significant source for these ions, especially nitrate. Dibenzo[a,h]anthracene and indeno[1,2,3,-cd]pyrene were the main PAH found, and a higher fraction of PAH particles was found in diameters lower than 0.25 μm in Londrina bus station. The fine and ultrafine particles were dominant among the PM evaluated, suggesting that biodiesel decreases the total PAH emission. However, it does also increase the fraction of fine and ultrafine particles when compared to diesel.

show abstract

Section: Resultssupporting

confidence: 87%

Particle emission from heavy-duty engine fuelled with blended diesel and biodiesel

Martins

Júnior

Solci

et al. 2011

Environ Monit Assess

Self Cite

View full text Add to dashboard Cite

show abstract

“…31 Each filter was extracted from the membranes containing particulate matter using 1 mL of deionized water under mechanical agitation at 100 rpm (Tecnal E140) for 90 min at room temperature. 44 Oxalate, malonate, succinate, formate and acetate were determined by ion chromatography using a SYCAM S1100 with Dionex AG11/HPIC-AS11 separation columns and Dionex AMMS micro-membrane suppressor.…”

Section: Analysis Methodsmentioning

confidence: 99%

“…Analytical precision was better than ± 3%. The limit of detection of the sampling method was defined as three In the analysis of chloride, nitrate and sulfate performed by Freitas and Solci, 31 the same systems and procedure used for carboxylic acids (as described above) were used. The limits of detection and quantification of the sampling method were 0.89 and 0.31; 0.29 and 2.99; 1.04 and 0.97 µmol L −1 for chloride, nitrate and sulfate, respectively.…”

Section: Analysis Methodsmentioning

confidence: 99%

Size-segregated particulate matter and carboxylic acids over urban and rural sites in Londrina City, Brazil

Freitas¹,

Martins

Solci³

2012

J. Braz. Chem. Soc.

Self Cite

View full text Add to dashboard Cite

Amostragens simultâneas de material particulado (PM) de 0,25 a 10 mm foram realizadas entre os meses de março e abril de 2007 em área urbana e rural de Londrina (Paraná). Os resultados indicaram que o material particulado fino (PM 2,5 ) representa uma significativa porção da massa de material particulado PM 10 (70 e 67% na área urbana e rural, respectivamente). Ácidos dicarboxílicos foram encontrados em maior concentração respondendo por 78% e 69% da massa de PM 2,5 na área urbana e rural, respectivamente, sendo que o oxalato e succinato foram os mais abundantes. A distribuição de massa do oxalato em área urbana apresentou picos dominantes em 0,25-0,5 µm. A razão de massa de acetato e formato indicou as emissões veiculares primarias como fonte dominante de ácidos carboxílicos em Londrina. Além disso, análises das trajetórias indicaram a ocorrência de transporte de poluentes do estado de São Paulo para a região de estudo.Samplings of atmospheric particulate matter (PM) from 0.25 to 10 µm were performed between the months of March and April 2007, simultaneously in urban and rural areas of Londrina City (Paraná State, Brazil). Results indicated that the fine fraction (PM 2.5 ) represents a significant portion of the PM 10 mass (70 and 67% in urban and rural areas, respectively). Dicarboxylic acids were found in larger concentration, contributing to the PM 2.5 fraction with 78% in urban and 69% in rural areas, being oxalate and succinate the most abundant species. Mass size distribution of oxalate in urban site was presented as the dominant mode, with peaks at 0.25-0.5 µm. Acetate-to-formate mass ratio indicated the primary vehicular emissions as dominant source of carboxylic acids in Londrina. Moreover, backward trajectories indicated the transport of pollutants from São Paulo State to Londrina region.Keywords: size-segregated particulate matter, carboxylic acids, PM 2.5 , urban and rural aerosols IntroductionThe occurrence and abundance of carboxylic acids in atmospheric particulate matter (PM) depend on meteorological conditions and characteristics of the ambient. The carboxylic acids represent a major fraction of the organic acids present in the atmospheric particulate matter. Among them, the oxalic acid has been the main species, followed by succinic and malonic acids. [1][2][3][4][5][6] Mono-and di-carboxylic acids are important groups of organic compounds identified in the atmospheric particles. 7,8 Formic and acetic acids, the dominant species of organic acids in tropospheric aqueous and gaseous phases, are also ubiquitous in aerosol particles. Oxalic acid has been detected as the major fraction of water-soluble organic compounds in urban, rural and even in remote areas. [3][4][5][6] Since carboxylic acids are highly water-soluble, they have the potential to modify the hygroscopic properties of atmospheric particles, including their ambient size and cloud condensation nuclei activity. 9,10 Weak organic acids could contribute ca. 40 and 60% to the free acidity in precipitation in urban and remote areas, respe...

show abstract

“…14,17,18 These particles are formed by gas-particle transformation through condensation of gaseous precursors and consist primarily of oxides. 19,20 Considering that most of the studies on atmospheric urban pollution were conducted in large (more than 1 million inhabitants) urban areas where limited action can be implemented to mitigate atmospheric pollution, in some regions conurbation is a fast growing process, and still there is time to take actions to mitigate atmospheric pollution, we choose to study the atmosphere over São José dos Campos, a city with about 630,000 inhabitants, which is a part of an important conurbation area between the two largest urban regions of Brazil. 16,21 The objective of this research is to study the characteristics of PM10, based on the data from one observation point that was strategically chosen to sample regional air, to identify the potential emission sources and correlating these characteristics to rainfall height, and speed and direction of wind to establish a sensible monitoring network.…”

Section: Introductionmentioning

confidence: 99%

Inhalable particulate matter characterization in a medium-sized urban region in Brazil (São José dos Campos Town) - Part I: Morphology

Ferreira¹,

Forti²,

Alcaide³

2013

Quím. Nova

View full text Add to dashboard Cite

Recebido em 22/4/13; aceito em 2/7/13; publicado na web em 2/8/13In this study, the concentration and morphological characteristics of inhalable particulate material (PM10) were evaluated and associated with climatic conditions. The mean annual concentration was 11.0 µg m . Wind speed has a higher influence on PM10 dispersion, but direction was associated with particle source. During the wet period, wind speed is the main dispersion factor, while speed and direction both are important during the dry period. Based on the morphological characteristics, it is concluded that biogenic particles prevail during the rainy season and terrigenous particles during the dry period, depending on the wind direction and intensity.

show abstract

Caracterização do MP10 e MP2,5 e distribuição por tamanho de cloreto, nitrato e sulfato em atmosfera urbana e rural de Londrina

Cited by 21 publications

References 22 publications

Particle emission from heavy-duty engine fuelled with blended diesel and biodiesel

Particle emission from heavy-duty engine fuelled with blended diesel and biodiesel

Size-segregated particulate matter and carboxylic acids over urban and rural sites in Londrina City, Brazil

Inhalable particulate matter characterization in a medium-sized urban region in Brazil (São José dos Campos Town) - Part I: Morphology

Contact Info

Product

Resources

About