3 edition of Sampling carbonaceous aerosols found in the catalog.
Sampling carbonaceous aerosols
by U.S. Environmental Protection Agency, Atmospheric Research and Exposure Assessment Laboratory in Research Triangle Park, NC
Written in English
|Other titles||Project summary|
|Statement||Roy L. Bennett and Leonard Stockburger|
|Contributions||Stockburger, Leonard, Air and Energy Engineering Research Laboratory|
|The Physical Object|
A portion of each quartz filter ( cm 2) was cut and used to determine the carbonaceous species using a thermal/optical transmittance aerosol carbon analyzer (Sunset Laboratory, OR, USA). The first stage of carbon analysis was performed in an inert helium atmosphere, while the second stage was conducted under an environment of 2% O 2 /98% He. Sampling is an indispensable and quite often critical step for the chemical characterization of atmospheric aerosol particles. Except for some on-line techniques which are capable of measuring the chemical composition of individual particles, most analytical methods require prior collection of the particles on a substrate.
method for comparable sampling of carbonaceous aerosol, and the difﬁculty to distinguish between OC and EC (Salma et al., ). With regard to artefacts arising during carbonaceous aerosol sam-pling, a number of authors (Turpin et al., ; Mader et al., ) demonstrated the prevalence of positive over negative artefacts. Positive sampling. Aerosol Science and Technology , 46 (2), DOI: / Pavel Mikuška, Zbyněk Večeřa, Anna Bartošíková, Willy Maenhaut. Annular diffusion denuder for simultaneous removal of gaseous organic compounds and air oxidants during sampling of carbonaceous aerosols.
This study examines the carbonaceous-aerosol characteristics at three contrasting urban environments in Greece (Ioannina, Athens, and Heraklion), on the basis of 12 h sampling during winter (January to February ), aiming to explore the inter-site differences in atmospheric composition and carbonaceous-aerosol characteristics and sources. The winter-average organic carbon (OC) and . Sampling Atmospheric Carbonaceous Aerosols Using a Particle Trap Impactor/Denuder Sampler. Environmental Science & Technology , 35 (24), DOI: /eso.
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Southeast Asia is one of the major regions of biomass burning in the world. To investigate the light absorption properties of carbonaceous aerosols produced from biomass burning, mass concentrations of PM and its major chemical compositions were obtained by filter sampling, and aerosol absorption coefficient (b ap) at nm (b apnm) and at nm (b apnm) were synchronously.
Carbonaceous Aerosols Sampling Artifacts As with most ambient aerosol measure- ments, the most frequently employed sam- pling technique for organic aerosols is collection on filters, usually quartz fiber filters.
Because the organic aerosols are a complex mixture of many compounds with a wide range of vapor pressure, sorp- tion properties, and. Sampling Carbonaceous Aerosols Sampling methods for determining or-ganic aerosol concentration and, if de-sired, the corresponding vapor phase concentration of semivolatile compounds have evolved from the simple arrange-ment of a single filter followed by a sor-bent trap.
As investigators have attempted to eliminate or quantify the various arti. Constantin Papastefanou, in Handbook of Radioactivity Analysis (Third Edition), 3 Aerosol Sampling.
The problem of sampling aerosols from the ambient atmosphere has been considered from a theoretical point of view by Liu and Pui ().Following a review of the various aerosol samplers and inlets used in ambient aerosol sampling, the factors contributing to high sampling efficiency for.
Improved measurement of carbonaceous aerosol: evaluation of the sampling artifacts and inter-comparison of the thermal-optical analysis methods. Cheng et al. Viewed. Show all Final revised paper only Preprint only Total article views: 2, Sampling Methods for Carbonaceous Aerosols nique wherein the sample is heated succes- sively to °C, "C, and °C in an He atmosphere over a MnO, catalyst, and the evolved CO, is catalytically reduced to methane for detection by flame ionization (Fung, ).
Southeast Asia is one of the major regions of biomass burning in the world. To investigate the light absorption properties of carbonaceous aerosols pr. 1. Introduction. Carbonaceous aerosols, composed mainly of organic carbon (OC) and elemental carbon (EC), play important roles in human health, radiative forcing and climate change, as they make up a significant proportion of particulate matter smaller than μm (PM ) (Jacobson,Mauderly and Chow, ).OC, a complex mixture of hundreds of organic compounds (e.g.
polycyclic. Carbonaceous aerosol sampling of gasoline direct injection engine exhaust with an integrated organic gas and particle sampler Author links open overlay panel Naomi Zimmerman a b 1 Khaled Rais b Cheol-Heon Jeong a Pallavi Pant c d Juana Mari Delgado-Saborit d 2 James S.
Wallace a b Greg J. Evans a Jeffrey R. Brook a e f Krystal J. Godri Pollitt g. Carbonaceous aerosols are one of major particle types in fine ambient particles and should be more toxic than inorganic ions. They are directly produced from various combustion sources (diesel and gasoline engine exhaust, biomass burning, coal burning, industrial emissions, domestic heating, cooking, and so on) and formed by gas-to-particle.
The first one collects a sample of atmospheric aerosols on a quartz fiber filter positioned inside a small stainless-steel chamber, at a controlled sampling flow rate of LPM. The default sampling time of TCA08 is 60 min, but can be set from 20 min – 24 h, depending on the ambient aerosol concentrations.
In order to investigate the size distributions and seasonal variations of carbonaceous aerosols (organic carbon (OC) and elemental carbon (EC)), the carbonaceous species were collected in Nanjing, a typical industrial city located in Yangtze River Delta, China, in the summer, autumn, and winter of and spring ofand then analyzed by.
More recent simultaneous measurements in smoke plumes of aerosol absorption with a photoacoustic instrument and the same BrC filter sampling system utilized here show an overall conversion ratio of (r 2 = ) for WS BrC to aerosol absorption at a wavelength of nm, consistent with the factor of 4 here, considering uncertainly (see.
The sampling artifacts (both positive and negative) and the influence of thermal-optical methods (both charring correction method and the peak inert mode temperature) on the split of organic carbon (OC) and elemental carbon (EC) were evaluated in Beijing.
The positive sampling artifact constituted 10% and 23% of OC concentration determined by the bare quartz filter during winter and summer. Carbonaceous aerosols are an important part of atmospheric fine particulate matter (PM ) in China and have a considerable impact on the atmospheric environment , accounting for approximately 20–50% of the PM mass concentration [2,3,4,5,6,7].Carbonaceous aerosols are composed of organic carbon (OC) and elemental carbon (EC) .The OC is mainly composed of primary organic.
Carbonaceous aerosols (CA) in environments have received special attention recently in the modern India, because of their effects on the local environment, water resources, agriculture production, ambient air quality, decline, visibility and public health (Jacobson ).The CA includes two components, organic carbon (OC) and elemental carbon (EC) also known to be as black carbon (BC).
Furthermore, in the course of the sampling, the composition of the collected organic compounds may be modified by oxidants (O_3, NO_2, PAN, peroxides) that are present in the air passing through the sampler. It is clear that new, artifact free, method for sampling of carbonaceous aerosols is needed.
surement of carbonaceous aerosols. Comparison between the backup quartz and the organic denuder approach could provide important insights into the sampling artifact problem (Cheng et al., ), but few studies have been published.
Another concern regarding the measurement of carbonaceous aerosols is the split duration sampling is an alternative choice for China, which might be more suitable for a general perspective of the PM composition on a national scale. Therefore, in this study we focus on the inﬂuence of sampling frequency (i.e., duration) on the measurement of carbonaceous aerosol.
It. Methods of Observation of Carbonaceous Aerosol.- Sampling of Carbonaceous Aerosol.- Methods for Determination of Main Carbonaceous Aerosol Components.- 3. Major Carbonaceous Particle Types and their Sources.- Soot-Black Carbon (BC), Elemental Carbon (EC), Graphitic Carbon.- Primary Organic Aerosol.- Secondary Organic Aerosol.
 Synchronous sampling of bulk‐aerosols, carried out during wintertime from the two strategically located sites in North India, reveals that total suspended particulates (TSP) over an urban site (Hisar: °N °E; m asl) ranged from 67 to μg m −3; in contrast, TSP at Manora Peak (a high‐altitude station: °N °E; m asl) was relatively low (range: to Vapor adsorption artifact in the sampling of organic aerosol: Face velocity effects.
Atmospheric Environment. Part A. General Topics24 (10), DOI: /(90) Douglas R. Lawson, Susanne V. Hering. The Carbonaceous Species. Ambient Aerosol Sampling. John G. Watson. Desert Research Institute, Nevada System of Higher Education, Reno, Nevada, USA Book Editor(s): Sui-Xin Liu, Ru-Jin Huang, Ning-ning Zhang, Ping Wang, The rural carbonaceous aerosols in coarse, fine, and ultrafine particles during haze pollution in northwestern China, Environmental Science and.