HR: 1340h
AN: A53A-0165 [Abstracts]
TI: Measurement of Sulfur Isotope Ratios in Micrometer-Sized Aerosol Samples by NanoSIMS
AU: * Winterholler, B
EM: winterho@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, Dept. Biogeochemistry, P.O. Box 3060, Mainz, D-55020
Germany
AU: Hoppe, P
EM: hoppe@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, Dept. Particle Chemistry, P.O. Box 3060, Mainz, D-55020
Germany
AU: Foley, S
EM: foley@uni-mainz.de
AF: Johannes Gutenberg University, Dep. Mineralogy, Joh.-J.-Becher-Weg 21, Mainz, D-55099
Germany
AU: Andreae, M O
EM: andreae@mpch-mainz.mpg.de
AF: Max Planck Institute for Chemistry, Dept. Biogeochemistry, P.O. Box 3060, Mainz, D-55020
Germany
AB:
The isotopic composition of sulfur in the atmosphere is highly variable and source dependent. Sulfur isotopic ratios are a
well established tool for identifying sources of sulfur in the environment, estimating emission factors, and tracing the
spread of sulfur from anthropogenic point sources in terrestrial ecosystems.
Conventional mass spectrometry needs a minimum of 1 micromol of sulfur to perform one analysis. In the case of atmospheric
aerosol particles the results of such an analysis averages the isotopic compositions of millions of aerosol particles, and
thus normally includes several different types of sulfur aerosol. The new Cameca NanoSIMS 50 ion microprobe technique permits
analysis of individual aerosol particles with volumes down to 0.3 cubic micron and a precision for delta34S of 3-10 (2
sigma). As a result, this technique is able to introduce a new scale into the study of the atmospheric sulfur cycle. Linking
the chemical, mineralogical, morphological and isotopic information of individual particles will allow a better understanding
of external and internal mixing states by analyzing more than one spot on coarse mode particles. Moreover it will improve
source identification by complementing the chemical and isotopic information.
First samples have been collected from the Sahara desert, an urban site in central Europe, and a costal site in Western
Ireland and show the potentials of this new technique.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0394 Instruments and techniques
DE: 0488 Sulfur cycling
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005