38 research outputs found
Progressing Pollutant Elution from Snowpack and Evolution of its Physicochemical Properties During Melting Period—a Case Study From the Sudetes, Poland
Atmospheric particle dry deposition of major ions to the South Atlantic coastal area observed at BaÃa de Todos os Santos, Brazil
Concentration and chemical composition of PM2.5 in Shanghai for a 1-year period
Weekly PM2.5 samples were collected in Shanghai, China at two sites, Tongji University and Hainan Road. Sampling started in March 1999 and was conducted for 1 year. The ambient mass concentration and chemical composition of the PM2.5 were determined. Chemical analyses included elemental composition, water-soluble ions, and organic and elemental carbon. Weekly PM2.5 mass concentrations ranged from 21 to 147 mug/m(3), with annual average concentrations of 57.9 and 61.4 mug/m(3) at the two sites, respectively. Seasonal variation Of PM2.5 concentrations was significant, with the highest concentrations observed from mid-November through December and the lowest from June through September. Ammonium sulfate and nitrate accounted for 41.6\% of the PM2.5 mass with sulfate alone accounting for 23.4\% of the PM2.5 mass. Carbonaceous material accounted for 41.4\% of the PM2.5 mass, with 73\% of that mass being organic, as defined by the TOR analysis method. Crustal components averaged 9.6\% of the PM2.5 mass. Potassium, which was 95\% water soluble, accounted for 2.7\% of the PM2.5 mass. (C) 2002 Elsevier Science Ltd. All rights reserved