TY - CONF A1 - Prost, J. A1 - Windbichler, A. A1 - de Oliveira Guilherme Buzanich, Ana A1 - Reinholz, Uwe A1 - Riesemeier, Heinrich A1 - Radtke, Martin A1 - Pepponi, G. A1 - Migliori, A. A1 - Karydas, A.G. A1 - Czyzycki, M. A1 - Eichert, D.M. A1 - Jark, W.H. A1 - Wobrauschek, P. A1 - Streli, C. T1 - SR-TXRF-XANES of indoor aerosol samples at BESSY II and ELETTRA N2 - Airborne particulate matter is an issue of growing concern in industrialized countries. Particles with diameters of less than 10 μm, in particular those with less 2.5 μm, are of special concern, as they can enter the human lungs and contribute to various cardiovascular and respiratory diseases. As the composition and health effects of airborne particles in urban, rural and industrial outdoor air has been studied abundantly, our focus lies on the analysis of airborne particle samples collected indoors, which may also have a significant effect on human health, depending on the chemical composition of the particles and the chemical bonding state, in which elements are present. This chemical speciation can be obtained using X-ray absorption near edge structure (XANES) analysis, which requires a tunable excitation source and therefore has to be carried out at synchrotron facilities. For this work, samples were collected in office rooms of the Atominstitut building. The BAMline at BESSYII, Berlin, features a double-multilayer monochromator (DMM) and a double-crystal monochromator (DCM). The DCM offers an energy resolution E/ΔE of around 103, which makes it suitable for X-ray absorption fine structure (XAFS) applications. The Atominstitut SR-TXRF vacuum chamber, formerly located at HASYLAB, Beamline L, is now available at the BAMline. The chamber offers a sample changer for up to 8 quartz carriers suitable for total reflection X-ray fluorescence analysis (TXRF) and was equipped with a 30 mm² silicon drift detector (SDD). Aerosol samples were produced using a modified three-stage Dekati™ impactor. For this work, only the coarse (2.5 to 10 μm, Stage 2) and the fine particle fraction (1 to 2.5 μm, Stage 3), were of interest. XANES analysis was performed for the elements Cr, Cu and Zn. Oxidation states of these 3 elements will be presented. The X-ray Fluorescence beamline at ELETTRA operates in partnership with the IAEA an ultra-high vacuum instrument with a 7-axis manipulator suitable for a variety of X-ray analytical techniques, such as grazing incidence X-ray fluorescence analysis (GI-XRF), TXRF, X-ray reflectometry (XRR) and XANES. Samples were produced using a four-stage Sioutas Personal Cascade Impactor. With this impactor, it is possible to produce sizefractionated samples down to the sub-μm range (Stages: A > 2.5 μm, B 1 to 2.5 μm, C 0.5 to 1 μm and D 0.25 to 0.5 μm). Direct sampling was performed on siliconized 25 mm Si wafers suitable for TXRF. Cu-K edge SR-TXRF-XANES analysis was carried out for samples of all impactor stages. Results of these experiments will be shown. T2 - Denver X-ray Conference CY - Rosemont, Illinois, USA DA - 01.08.2016 KW - Synchrotron KW - BAMline KW - XANES KW - Aerosol PY - 2016 AN - OPUS4-38762 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -