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Comprehensive characterization of ambient nanoparticles collected near an industrial science park:Particle size distributions and relationships with environmental factors

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Journal of Environmental Sciences 2011年第8期23卷 1334-1341页

作者： Yuhjeen Huang Lingyen Hsu Yunghsun Chang Department of Biomedical Engineering and Environmental Sciences "National" Tsing Hua University

We investigated the characteristics of ambient particles and their relationships with various environmental factors, including gaseous pollutants （CI-h, non-methane hydrocarbons （NMHC）, total hydrocarbons （THC）, NOx, CO, SO2）, meteorological parameters （humidity, temperature）, and time （day/night, workday/weekend）. We used an electrical low-pressure cascade impactor to measure the number and size distributions of ambient particles （0.007-10 ~m） that were collected approximately 1 km northwest of Hsinchu Science Park in Taiwan between February and May 2007. The number concentrations of particles were enhanced through photochemical reactions during the day. In addition, high traffic flow during workdays increased the formation of particulates. Except for SO2, all of the gaseous pollutants we studied （CH4, NMHC, THC, NOx, CO） correlated positively with the total number concentrations of ambient particles during daytime, indicating that they might contribute to the particulate burden. The poorer relationship between the SO2 level and the total number concentration of particles suggests that SO2 might participate indirectly in the nucleation process during particle formation, The high enrichment factors for Zn, Pb, Cu, and Mn, which mostly comprised the ultrafine particles （diameter：〈 0.1 Ixm） and fine particles （diameter： 0.1-1 ~tm）, presumably arose from emissions from traffic and high technology factories. Heterogeneous reactions on solid particles might play a role in the removal of SOx and NOx from the atmosphere. Sulfides and nitrides can further react with these local pollutants, forming specific Cu-containing compounds： Cut （39%）, CuSO4 （34%）, and Cu（NO3）2 （27%）, within the ambient particles in this industrial area.

关键词： environmental factors ambient particles electrical low-pressure impactor (ELPI) XANES

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Physicochemical characterization and bioreactivity of coarse/fine/ultrafine particulate matters in Shanghai Atmosphere

Physicochemical characterization and bioreactivity of coarse...

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中国毒理学会第五次全国学术大会

作者： Shinichi Yonemochi Ken Donaldson The Center for Environmental Sciences in Saitama Center for Inflammation Research the University of EdinburghScotlandUK

Epidemiologic studies have demonstrated positive relationships between increases in air pollution and adverse health *** major pollutants in the Shanghai atmosphere, physicochemical characterization of ambient particles,PM10 and PM(PMor PM10,particles with aerodynamics diameters less than 2.5 m or 10 m,respectively)and ultrafine particles (UFP,aerodynamic diameter less than 0.1 m)were investigated in this *** results demonstrated that mass concentrations of different size ambient particles collected in urban air are higher than that in suburban air,and that mass level of different size particles are *** highest mass concentration of ambient particles was contributed by the PM 0.56-0.32,while the lowest was found in the particles with diameter 1-0.56 m andparticles consisted of minerals,while the fine particles were mainly composed of sulfates,and there were few particles in the ultrafine ***-MS results showed the highest mass level of heavy metals and the lowest mass level of crustal elements was found in PM1.0-0.56,while the lowest value of these elements was discovered in the ultrafine *** radical-generating ability of the different size particles was tested by *** free radical signals of ambient fine particles were higher than those of coarse,ultrafine *** assay was employed to investigate cellular toxicity of the ambient *** results of cell proliferation assay demonstrated that potency to A549 cell death ratio induced by ultrafine particles was slightly higher compared with fine and coarse *** mechanism of toxic phenomena caused by the different size ambient particles needs further exploration.

关键词： air pollution ambient particles physicochemical characterization toxicity

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