Organic speciation of atmospheric particles in Alvão Natural Park (Portugal)

Alves, Célia; Gonçalves, Cátia; Mirante, Fátima; Nunes, Teresa; Evtyugina, Margarita; Campa, Ana M. Sánchez de la; Marques, Margarida Correia

doi:10.1007/s10661-009-1116-1

Cited by 15 publications

(4 citation statements)

References 73 publications

(95 reference statements)

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“…Isoprene SOA has substantial influence on climate by contributing to the pool of cloud condensation nuclei (CCN) (see Carlton et al, 2009, and references therein). Furthermore, the photooxidation of isoprene produces important biogenic SOA tracers 2-methyltetrols and 2-methylglyceric acid (2MGA) (Claeys et al, 2004;Wang et al, 2005;Alves et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Effect of humidity on the composition of isoprene photooxidation secondary organic aerosol

et al. 2011

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The effect of relative humidity (RH) on the composition and concentrations of gas-phase products and secondary organic aerosol (SOA) generated from the photooxidation of isoprene under high-NO<sub>x</sub> conditions was investigated. Experiments were performed with hydrogen peroxide as the OH precursor and in the absence of seed aerosol. The relative yields of most gas-phase products were the same regardless of initial water vapor concentration with exception of hydroxyacetone and glycolaldehyde, which were considerably affected by RH. A significant change was observed in the SOA composition, with many unique condensed-phase products formed under humid (90 % RH) vs. dry (<2 % RH) conditions, without any detectable effect on the rate and extent of the SOA mass growth. There is a 40 % reduction in the number and relative abundance of distinct particle-phase nitrogen-containing organic compounds (NOC) detected by high resolution mass spectrometry. The suppression of condensation reactions, which produce water as a product, is the most important chemical effect of the increased RH. For example, the total signal from oligomeric esters of 2-methylglyceric acid was reduced by about 60 % under humid conditions and the maximum oligomer chain lengths were reduced by 7–11 carbons. Oligomers formed by addition mechanisms, without direct involvement of water, also decreased at elevated RH but to a much smaller extent. The observed reduction in the extent of condensation-type oligomerization at high RH may have substantial impact on the phase characteristics and hygroscopicity of the isoprene aerosol. The reduction in the amount of organic nitrates in the particle phase has implications for understanding the budget of NOC compounds

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Section: Introductionmentioning

confidence: 99%

Effect of humidity on the composition of isoprene photooxidation secondary organic aerosol

et al. 2011

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“…[5][6][7][8][9] The portion resulting from the anthropogenic sources is composed of two classes of compounds: one is inorganic (e.g., metals, sulphates, nitrates, ammonium) and other is a carbonaceous fraction (i.e., total carbon). The compound classes for tracking the particle emissions from motor vehicles consist of several homologous series of petroleum biomarkers (hopanes and sterones).…”

Section: Introductionmentioning

confidence: 99%

“…The compound classes for tracking the particle emissions from motor vehicles consist of several homologous series of petroleum biomarkers (hopanes and sterones). [5][6][7][8][9] The portion resulting from the anthropogenic sources is composed of two classes of compounds: one is inorganic (e.g., metals, sulphates, nitrates, ammonium) and other is a carbonaceous fraction (i.e., total carbon). In particular, the carbonaceous material is considered a very important parameter for the urban air quality evaluation.…”

Section: Introductionmentioning

confidence: 99%

Measurement of organic and elemental carbon in downtown Rome and background area: physical behavior and chemical speciation

Avino

Manigrasso

Rosada

et al. 2015

Environ. Sci.: Processes Impacts

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A significant portion of the particulate matter is the total carbonaceous fraction (or total carbon, TC), composed of two main fractions, elemental carbon (EC) and organic carbon (OC), which shows a large variety of organic compounds, e.g. aliphatic, aromatic compounds, alcohols, acids, etc. In this paper, TC, EC and OC concentrations determined in a downtown Rome urban area are discussed considering the influence of meteorological conditions on the temporal-spatial aerosol distribution. Similar measurements were performed at ENEA Casaccia, an area outside Rome, which is considered as the ome background. Since 2000, TC, EC and OC measurements have been performed by means of an Ambient Carbon Particulate Monitor equipped with a NDIR detector. The EC and OC concentrations trends are compared with benzene and CO trends, which are specific indicators of autovehicular traffic, for identifying the primary EC and OC contributions and the secondary OC fraction origin. Further, a chemical investigation is reported for investigating how the main organic (i.e., n-alkanes, n-alkanoic acids, polyaromatic hydrocarbons and nitro-polyaromatic hydrocarbons) and inorganic (i.e., metals, ions) fractions vary their levels during the investigated period in relationship to new regulations and/or technological innovations.

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“…Isoprene (2-methyl-1,3-butadiene, C 5 H 8 ), the most abundant nonmethane hydrocarbon in the atmosphere, is a major precursor to secondary organic aerosol (SOA). − Photooxidation of isoprene produces a number of compounds that end up in SOA, including tracer molecules 2-methylglyceric acid (2MGA) and 2-methyltetrols. − Oligomer formation by particle-phase accretion reactions is significant in isoprene SOA. , …”

Section: Introductionmentioning

confidence: 99%

Nitrogen-Containing Organic Compounds and Oligomers in Secondary Organic Aerosol Formed by Photooxidation of Isoprene

Nguyen

Laskin

et al. 2011

Environ. Sci. Technol.

101

131

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Electrospray ionization high-resolution mass spectrometry (ESI HR-MS) was used to probe molecular structures of oligomers in secondary organic aerosol (SOA) generated in laboratory experiments on isoprene photooxidation at low- and high-NO(x) conditions. Approximately 80-90% of the observed products are oligomers and up to 33% by number are nitrogen-containing organic compounds (NOC). We observe oligomers with maximum 8 monomer units in length. Tandem mass spectrometry (MS(n)) confirms NOC compounds are organic nitrates and elucidates plausible chemical building blocks contributing to oligomer formation. Most organic nitrates are comprised of methylglyceric acid units. Other important multifunctional C(2)-C(5) monomer units are identified including methylglyoxal, hydroxyacetone, hydroxyacetic acid, and glycolaldehyde. Although the molar fraction of NOC in the high-NO(x) SOA is high, the majority of the NOC oligomers contain only one nitrate moiety resulting in a low average N:C ratio of 0.019. Average O:C ratios of the detected SOA compounds are 0.54 under the low-NO(x) conditions and 0.83 under the high-NO(x) conditions. Our results underscore the importance of isoprene photooxidation as a source of NOC in organic particulate matter.

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Organic speciation of atmospheric particles in Alvão Natural Park (Portugal)

Cited by 15 publications

References 73 publications

Effect of humidity on the composition of isoprene photooxidation secondary organic aerosol

Effect of humidity on the composition of isoprene photooxidation secondary organic aerosol

Measurement of organic and elemental carbon in downtown Rome and background area: physical behavior and chemical speciation

Nitrogen-Containing Organic Compounds and Oligomers in Secondary Organic Aerosol Formed by Photooxidation of Isoprene

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