Analytische Chemie
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- 2016 (2)
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- Aerosol (2) (entfernen)
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.
Airborne particulate matter is an issue of growing concern in industrialized countries. Particles with diameters of less than 10 μm (especially those smaller than 2.5 μm) can enter the human respiratory system and contribute to various diseases depending on their chemical composition and the chemical bonding state, in which elements are present. This chemical speciation can be obtained using X-ray absorption near-edge structure analysis (XANES), which requires a tunable excitation source and therefore has to be carried out at synchrotron facilities. Our special interest lies on the analysis of indoor airborne particulate matter, as particle composition and health effects of outdoor particles have been studied abundantly. For this work, samples were collected in various office rooms in the Atominstitut (ATI) building.
The BAMline at BESSYII 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 XANES applications. The ATI 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 reflectors and a 30 mm² silicon drift detector (SDD) was used. Aerosol samples were produced using a modified three-stage Dekati™ impactor. For this work, only the coarse (2.5 to 10 μm) and the fine particle fraction (1 to 2.5 μm), were of interest. XANES results of Cr, Cu and Zn will be presented on this poster.
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 and total reflection X-ray fluorescence analysis (GI-XRF and 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 size-fractionated 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.