Analysis of impacted aerosols and XANES to determine oxidation

							    Analysis of impacted aerosols and XANES to determine oxidation state
To understand the effect of aerosols on global climate a detailed understanding of
sources, transport, and fate and not at least of the physical and chemical properties
of atmospheric particles is necessary. Using SR-TXRF application, sampling time can
be diminished resulting in a more precise resolution of atmospheric events. To
optimise sampling and measurements a method that uses aerosol collector plates
directly as sample carriers for SR-TXRF application is desirable and developed.
Aerosol samples, directly sampled on sample reflectors are investigated and XANES
measurements should help to determine the oxidation state of toxic elements, using
the feature of TXRF that only small sample masses are required. In this case the
specimen can be collected directly on the clean reflector by means of impactors that
can also separate the particulate matter by size. The chemical speciation of the toxic
elements is of relevance for the environmental impact. This is done in cooperation
with Prof. Broekaert, Inst. Of Anorganic and Applied Chemistry, Univ. Hamburg.