scholarly journals Elemental Mass Size Distribution for Characterization, Quantification and Identification of Trace Nanoparticles in Serum and Environmental Waters

2017 ◽  
Vol 51 (7) ◽  
pp. 3892-3901 ◽  
Author(s):  
Xiao-xia Zhou ◽  
Jing-fu Liu ◽  
Gui-bin Jiang
Keyword(s):  
Size Distribution ◽  
Environmental Waters ◽  
Mass Size Distribution ◽  
Mass Size ◽  
Elemental Mass

Preliminary study of elemental mass size distribution of urban aerosol collected in Debrecen, Hungary

1999 ◽  
Vol 30 ◽  
pp. S273-S274 ◽  
Author(s):  
Zs. Kerte´sz ◽  
I. Borbe´ly-Kiss ◽  
A´.Z. Kiss ◽  
E. Koltay ◽  
Gy. Szabo´
Keyword(s):  
Size Distribution ◽  
Urban Aerosol ◽  
Mass Size Distribution ◽  
Mass Size ◽  
Preliminary Study ◽  
Elemental Mass

ELEMENTAL MASS SIZE DISTRIBUTION OF ATMOSPHERIC AEROSOL IN PRAGUE

2001 ◽  
Vol 32 ◽  
pp. 167-168
Author(s):  
J. SCHWARZ ◽  
L. DŽUMBOVÁ ◽  
J. KUGLER ◽  
J. SMOLÍK ◽  
R. HILLAMO ◽  
...  
Keyword(s):  
Size Distribution ◽  
Atmospheric Aerosol ◽  
Mass Size Distribution ◽  
Mass Size ◽  
Elemental Mass

scholarly journals Impact of vehicular emissions on the formation of fine particles in the Sao Paulo Metropolitan Area: a numerical study with the WRF-Chem model

2016 ◽  
Vol 16 (2) ◽  
pp. 777-797 ◽  
Author(s):  
A Vara-Vela ◽  
M. F. Andrade ◽  
P. Kumar ◽  
R. Y. Ynoue ◽  
A. G. Muñoz
Keyword(s):  
Size Distribution ◽  
Metropolitan Area ◽  
Atmospheric Aerosols ◽  
Fine Particles ◽  
Sao Paulo ◽  
Vehicular Emissions ◽  
São Paulo ◽  
Mass Size Distribution ◽  
Mass Size ◽  
The Impact

Abstract. The objective of this work is to evaluate the impact of vehicular emissions on the formation of fine particles (PM2.5;  ≤  2.5 µm in diameter) in the Sao Paulo Metropolitan Area (SPMA) in Brazil, where ethanol is used intensively as a fuel in road vehicles. The Weather Research and Forecasting with Chemistry (WRF-Chem) model, which simulates feedbacks between meteorological variables and chemical species, is used as a photochemical modelling tool to describe the physico-chemical processes leading to the evolution of number and mass size distribution of particles through gas-to-particle conversion. A vehicular emission model based on statistical information of vehicular activity is applied to simulate vehicular emissions over the studied area. The simulation has been performed for a 1-month period (7 August–6 September 2012) to cover the availability of experimental data from the NUANCE-SPS (Narrowing the Uncertainties on Aerosol and Climate Changes in Sao Paulo State) project that aims to characterize emissions of atmospheric aerosols in the SPMA. The availability of experimental measurements of atmospheric aerosols and the application of the WRF-Chem model made it possible to represent some of the most important properties of fine particles in the SPMA such as the mass size distribution and chemical composition, besides allowing us to evaluate its formation potential through the gas-to-particle conversion processes. Results show that the emission of primary gases, mostly from vehicles, led to a production of secondary particles between 20 and 30 % in relation to the total mass concentration of PM2.5 in the downtown SPMA. Each of PM2.5 and primary natural aerosol (dust and sea salt) contributed with 40–50 % of the total PM10 (i.e. those  ≤  10 µm in diameter) concentration. Over 40 % of the formation of fine particles, by mass, was due to the emission of hydrocarbons, mainly aromatics. Furthermore, an increase in the number of small particles impaired the ultraviolet radiation and induced a decrease in ozone formation. The ground-level O3 concentration decreased by about 2 % when the aerosol-radiation feedback is taken into account.

Relation between particle number and mass size distribution in the diesel car exhaust

1999 ◽  
Vol 30 ◽  
pp. S777-S778 ◽  
Author(s):  
V.-M. Kerminen ◽  
T. Mäkelä ◽  
R. Hillamo ◽  
L. Rantanen
Keyword(s):  
Size Distribution ◽  
Particle Number ◽  
Mass Size Distribution ◽  
Car Exhaust ◽  
Mass Size

Mass size distribution of major monosaccharide anhydrides and mass contribution of biomass burning

2019 ◽  
Vol 220 ◽  
pp. 1-9 ◽  
Author(s):  
Zoltán Imre Blumberger ◽  
Anikó Vasanits-Zsigrai ◽  
Gergő Farkas ◽  
Imre Salma
Keyword(s):  
Size Distribution ◽  
Biomass Burning ◽  
Mass Size Distribution ◽  
Mass Size ◽  
Monosaccharide Anhydrides

scholarly journals Role of black carbon mass size distribution in the direct aerosol radiative forcing

2019 ◽  
Vol 19 (20) ◽  
pp. 13175-13188 ◽  
Author(s):  
Gang Zhao ◽  
Jiangchuan Tao ◽  
Ye Kuang ◽  
Chuanyang Shen ◽  
Yingli Yu ◽  
...  
Keyword(s):  
Size Distribution ◽  
Black Carbon ◽  
Radiative Forcing ◽  
Climate Models ◽  
Radiative Effects ◽  
Aerosol Radiative Forcing ◽  
Mass Size Distribution ◽  
Mass Size ◽  
Mixing States ◽  
Aerosol Radiative

Abstract. Large uncertainties exist when estimating radiative effects of ambient black carbon (BC) aerosol. Previous studies about the BC aerosol radiative forcing mainly focus on the BC aerosols' mass concentrations and mixing states, while the effects of BC mass size distribution (BCMSD) were not well considered. In this paper, we developed a method of measuring the BCMSD by using a differential mobility analyzer in tandem with an Aethalometer. A comprehensive method of multiple charging corrections was proposed and implemented in measuring the BCMSD. Good agreement was obtained between the BC mass concentration integrated from this system and that measured in the bulk phase, demonstrating the reliability of our proposed method. Characteristics of the BCMSD and corresponding radiative effects were studied based on a field measurement campaign conducted in the North China Plain by using our own measurement system. Results showed that the BCMSD had two modes and the mean peak diameters of the modes were 150 and 503 nm. The BCMSD of the coarser mode varied significantly under different pollution conditions with peak diameter varying between 430 and 580 nm, which gave rise to significant variation in aerosol bulk optical properties. The direct aerosol radiative forcing was estimated to vary by 8.45 % for different measured BCMSDs of the coarser mode, which shared the same magnitude with the variation associated with assuming different aerosol mixing states (10.5 %). Our study reveals that the BCMSD as well as its mixing state in estimating the direct aerosol radiative forcing matters. Knowledge of the BCMSD should be fully considered in climate models.

scholarly journals Assessment of Air Quality in School Environments in Hanoi, Vietnam: A Focus on Mass-Size Distribution and Elemental Composition of Indoor-Outdoor Ultrafine/Fine/Coarse Particles

Atmosphere ◽  
2020 ◽  
Vol 11 (5) ◽  
pp. 519
Author(s):  
Trinh Dinh Tran ◽  
Phuong Minh Nguyen ◽  
Dung Trung Nghiem ◽  
Tuyen Huu Le ◽  
Minh Binh Tu ◽  
...  
Keyword(s):  
Trace Elements ◽  
Elemental Composition ◽  
Size Distribution ◽  
World Health ◽  
Emission Sources ◽  
Mass Size Distribution ◽  
Minor Elements ◽  
Mass Size ◽  
Pm2.5 And Pm10 ◽  
Indoor And Outdoor

Indoor and outdoor ultrafine, accumulation mode, and coarse fractions collected at two preschools (S1 and S2) in Hanoi capital, Vietnam were characterized in terms of mass-size distribution and elemental composition to identify major emission sources. The sampling campaigns were performed simultaneously indoors and outdoors over four consecutive weeks at each school. Indoor average concentrations of CO2 and CO at both schools were below the limit values recommended by American Society of Heating, Refrigerating and Air-Conditioning Engineers (1000 ppm for CO2) and World Health Organization (7 mg/m3 for CO). Indoor concentrations of PM2.5 and PM10 at S1 and S2 were strongly influenced by the presence of children and their activities indoors. The indoor average concentrations of PM2.5 and PM10 were 49.4 µg/m3 and 59.7 µg/m3 at S1, while those values at S2 were 7.9 and 10.8 µg/m3, respectively. Mass-size distribution of indoor and outdoor particles presented similar patterns, in which ultrafine particles accounted for around 15–20% wt/wt while fine particles (PM2.5) made up almost 80% wt/wt of PM10. PM2.5–10 did not display regular shapes while smaller factions tended to aggregate to form clusters with fine structures. Oxygen (O) was the most abundant element in all fractions, followed by carbon (C) for indoor and outdoor particles. O accounted for 36.2% (PM0.5–1) to 42.4% wt/wt (PM0.1) of indoor particles, while those figures for C were in the range of 14.5% (for PM0.1) to 18.1% (for PM1–2.5). Apart from O and C, mass proportion of other major and minor elements (Al, Ca, Cr, Fe , K, Mg, Si, Ti) could make up to 50%, whereas trace elements (As, Bi, Cd, Co, Cr, Cu, La, Mn, Mo, Ni, Pb, Rb, Sb, Se, Sn, Sr, and Zn) accounted for less than 0.5% of indoor and outdoor airborne particles. There were no significant indoor emission sources of trace and minor elements. Traffic significantly contributed to major and trace elements at S1 and S2.

Preliminary studies of elemental carbon mass size distribution in Katowice

1989 ◽  
Vol 20 (8) ◽  
pp. 1265-1268 ◽  
Author(s):  
J.S. Pastuszka ◽  
J. Kolarczyk ◽  
A. Sztyler
Keyword(s):  
Size Distribution ◽  
Elemental Carbon ◽  
Mass Size Distribution ◽  
Mass Size ◽  
Carbon Mass
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