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Abstract  

A simple destructive neutron activation method for the determination of Hg and Se has been developed. The irradiated, sample is heated in a stream of oxygen at 1000°C, in a quartz tube in which two charcoal traps are positioned. The evaporated Hg, Se and contaminants such as Br are collected in the first charcoal trap. Only Hg is removed to the second trap by heating the first one at 750°C in a stream of nitrogen. The charcoal traps are them measured with a Ge(Li) detector. The analytical results obtained by this method for Hg and Se in several biological standard reference materials showed good agreement with the certified values.

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Abstract  

The present paper describes radiochemical separation procedures developed for the determination of the elements As, Cr, Hg, Sb and Se in biological reference materials. The methods chosen utilize ion exchange, retention on inorganic exchangers and solvent extraction techniques for the isolation of the elements of interest. These procedures are more rapid than previously used methods, such as distillation and precipitation. As to the sample dissolution, the following procedures were tested using radioactive tracers and reference materials: treatment of the materials in teflon bombs with a mixture of HNO3+H2SO4 or HNO3 only in a normal oven, and with HNO3 in a microwave oven using specially designed digestion bombs.

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Journal of Radioanalytical and Nuclear Chemistry
Authors:
R. Zeisler
,
N. Haselberger
,
M. Makarewicz
,
R. Ogris
,
R. Parr
,
S. Stone
,
O. Valkovic
,
V. Valkovic
, and
E. Wehrstein

Abstract  

The most important fraction of aerosols with respect to human health is the respirable fraction, which has particles less than 10 m in equivalent aerodynamic diameter (EAD), the so called PM 10 fraction. The collection of these respirable particles and the determination of their trace element composition is the focus of an IAEA Co-ordinated Research Programme (CRP). The IAEA Laboratory participated in this Programme and established collection sites for the air particulate samples on the grounds of the Atominstitute of the Austrian Universities in Vienna and the IAEA Laboratories, Seibersdorf, representing an urban residential site and a rural site. The collected samples as well as samples of simulated air filters (used also for blind controls) and control materials were analyzed sequentially and/or in sections by X-ray fluorescence (XRF), proton induced X-ray emission (PIXE), instrumental neutron activation analysis (INAA), and atomic absorption spectrometry (AAS). Results demonstrate the applicability of the PM-10 sampling approach, provided PIXE and/or INAA are used in the determinations. Reliable results can be obtained that will lead in comparable air pollution data for many regions in the world through CRP.

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