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List of Abstracts 166P-Observations 2.7 ID:4406 10:30Chemical composition of aerosols in a tropical region considering the influence of local and longdistance transport of pollutantsAdriana Gioda, Beatriz Silva AmaralPontifical Catholic UniversityContact: agioda@puc-rio.brAerosols can affect the climate by changing the way radiation is transmitted through the atmosphere. Directobservations of aerosols are quite limited, making any attempt to estimate their global effect difficult. Due tothe uncertainties of aerosol radiative forcing measurements around the world, especially in SouthernHemisphere tropical regions, to a better estimate of their effects is necessary. The objective of this study is todetermine the chemical composition of aerosol samples collected in the Rio de Janeiro metropolitan area,under the influences of different local (natural, industrial and traffic) and long-range transport. The aerosolsamples were collected for one year (2008-2009). Concentration levels of aerosols, metals, water- solubleions, and soluble organic and nitrogen fractions were measured. Preliminary results showed that the meanaerosol concentrations were 36 µg/m3; 50 µg/m3 and 74 µg/m3 at the natural, downtown and industrial sites,respectively. An increase in the average particle concentrations was observed in the period from May toSeptember probable due to air stagnation increasing pollutant concentrations. Average concentrations ofanions were 1.7 µg/m3 for Cl-, 2.7 µg/m3 for NO3-, 2.5 µg/m3 for SO4= and for cations were 2.9 µg/m3 forNa+, 1.0 µg/m3 for Ca++, 0.3 µg/m3 for K+ and Mg++. Low levels of NH4+ and organic acids (0.04-0.10µg/m3) were measured. Average water-soluble organic compounds (WSOC) were detected in similarconcentrations to the main ions species (2.1 µg/m3). The studied species concentrations are influenced by thesite locations. At the natural site, lower concentrations of NO3- and SO4= were detected as well as when airmasses came from the ocean. According to satellite images, Saharan dust reached the sampling sites,increasing from two to five times aerosols, Ca2+and K+ concentrations. This is the first study reporting theincrease of some aerosol species in Rio de Janeiro due to African outbreaks. Other results of nitrogencompounds and metals will be presented at the meeting.P-Observations 2.8 ID:4306 10:30Dry deposition of trace elements in central IndiaMadhuri Rajak 1 , K.S. Patel 1 , G. Agnihotri 1 , W. Corns 2 , B. Chen 2 , B. Blazhev 3 , E. Yubero 4 , J. Nicolás 41 School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur-492010, India2 PS Analytical Ltd, Arthur House, Unit 3 Crayfields Industrial Estate, Orpington, Kent, BR5 3HP, UK3 Central Laboratory for Chemical Testing and control, 1330-Sofia, Bulgaria4 Atmospheric Pollution Laboratory, Applied Physics Department, Miguel Hernandez University, Avda de lContact: analrsu@sify.comThe vast industrialization and urbanization result in substantial increase of the aerosol concentration in urbansites of India. The aerosol concentration is reached maximum in the winter season (December/January) of ayear with serious environmental and health hazards. The nature of atmospheric deposition reflects the qualityof water and precipitates. Therefore, thirteen resuspended dust deposited in the roof of building of Raipurcity (capital of Chhattisgarh state, India) from the residential(Re), commercial(Co) and industrial(In) siteswere collected in January, 2009. The dust of mesh size ≥ 0.1 mm was sieved out. The concentration of traceelements and ions in dust were determined. The metals i.e. Al, Fe and Mn showed the highest concentration,ranged from 2.6 – 4.0, 5.2 – 12.4 and 0.3 – 9.5% with mean value of 3.0±0.2, 9.2±1.3 and 1.9±1.6%,respectively at 95% probability. Similarly, the concentration of Cr, Ni, Cu, Zn, Cd and Pb is ranged from 54– 527, 25 – 172, 37 – 157, 72 – 408, 63 – 251 and 0.10 – 0.91 mg kg-1 with mean value of 127±68, 49±21,74±19, 275±48, 115±30 and 0.29±11 mg kg-1, respectively. Four metals i.e. Fe, Mn, Zn and Cd exhibitediCACGP-IGAC 2010 14 July, 2010