Size Resolved Chemical Composition of Atmospheric Aerosols Collected in Winter over the Eastern Mediterranean Area

0166461 - UCHP-M 20020148 RIV TW eng C - Conference Paper (international conference)
Smolík, Jiří - Ždímal, Vladimír - Eleftheriadis, K. - Havránek, Vladimír - Mihalopoulos, N. - Schwarz, Jaroslav - Colbeck, I. - Lazaridis, M.
Size Resolved Chemical Composition of Atmospheric Aerosols Collected in Winter over the Eastern Mediterranean Area.
Abstracts. Vol. 1. Taipei, 2002 - (Wang, C.), s. 301-302. ISBN 986-80544-1-9.
[International Aerosol Conference /6./. Taipei, (TW), 09.09.2002-13.09.2002]
Grant - others:EVK2(XE) CT/1999/00052
Keywords : atmospheric aerosols * elemental composition * chemical composition
Subject RIV: CF - Physical ; Theoretical Chemistry

The SUB-AERO project aims at assessing important components of the budget of airborne pollutants in subgrid scale in the eastern Mediterranean area. Within this project a comprehensive study is performed of the physical, chemical and radiative aerosol characteristics including some aerosol precursors. Recently, we have reported (Smolík et al., 2001) on mass and elemental size distributions of atmospheric aerosol collected at Finokalia sampling site on Crete during the summer campaign (10. - 31. 7. 2000). Finokalia (35o 19' N, 25o 40' E) is a coastal remote site eastward Heraklion on the top of a hill (elevation 130m) facing the sea within the sector of 270o to 90o. Depending on the weather the air masses reaching the station originate from Europe to Africa. The current work reports mass, elemental and chemical size distributions of atmospheric aerosol collected by low pressure cascade impactor at Finokalia during the winter campaign (7. - 14. 1. 2001). METHODS Samples of atmospheric particulate matter wer e collected and size segregated by a Berner type low-pressure cascade impactor BLPI 25/0.018/2. The sampling was carried out on the roof of small building with the impactor fixed facing the usual wind direction at the height about 3 m above the ground. The impactor had an multidirectional inlet providing approximately 15 microm upper cut-off particle size. The samples were deposited on Nuclepore polycarbonate foils greased by Apiezone L. Sampling was carried out over 24-hour intervals. The mass size distributions were obtained from the mass of particulate matter deposited on the individual stages, volume flow rate of aerosol and total time of sampling. Further, samples were analysed by ion chromatography (IC) and particle-induced X-ray emission (PIXE). A Dionex AS4A-SC column with ASRS-I suppressor in auto suppression mode of operation was used for the analysis of anions SO42-, NO3-, and Cl-. For cations K+, Na+, NH4+, Ca2+, and Mg2+a CS12-CS column was used with a CSRS-I suppressor. PIXE analyses were performed on 3MeV Van de Graaff electrostatic accelerator at NPI (Nuclear Physics Institute) in Řež. In common samples usually the Al, Si, Cl, Br, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Sr and Pb elements were determined. Elements up to Ti were determined from 1.31 MeV whilst the rest of elements from 2.35 MeV measurement. RESULTS A total of 7 mass size distributions were obtained. They were bimodal with mode mean diameters around 0.4 microm and 5 microm and with minimum between both modes at around 1 microm. The raw size data were inverted into smooth size distributions by the MICRON code (Wolfenbarger and Seinfeld, 1990). The inverted distributions were integrated to obtain PM1 and PM10 concentrations. In comparison with the summer measurements both PM1 and PM10 were lower. As can be seen on Fig. 1, PM1 decreased during the whole period from 9 to 4 microg/cm3 , PM10 varied between 10 and 20 microg/cm3 .
Permanent Link: http://hdl.handle.net/11104/0063584