This paper reports the results of an optimisation study for a procedure to determine the total selenium and its inorganic species, Se(IV) and Se(VI) using atomic absorption spectrometry combined with hydride generation and in-situ trapping of the analyte on the inner walls of the graphite tube. With the use of the proposed modi cation, a detection limit (3¼ ) of 0.018 ng/ml is achieved. This paper presents exemplary results, according to the proposed procedure, for selenium determination in samples of marine water. The concentrations of selenium in the samples ranged from < 0.02 ng/ml to 0.16 ng/ml of Se(IV) and from < 0.02 ng/ml to 0.10 ng/ml of Se(VI).
In order to determine the concentrations of atmospheric selenium and divide it into size classes, aerosols were collected on nitro-cellulose filters, using the PIXE impactors, at three coastal stations in Preila (Lithuania), Hoburg (Gotland, Sweden) and Kap Arkona (Rugia Island, Germany). The determination of selenium and other elements in samples was made using the TXRF (total-reflection X-ray fluorescence) analysis. Air mass trajectories and the results of selenium studies indicate that the highest concentrations of selenium occur with air masses advecting from western and southwestern Europe, while the smallest concentrations were observed for air masses from north and northeastern Europe. It was confirmed that submicron particles of sizes smaller than 2 μm dominate the transport of suspended selenium. It was revealed that selenium in the air above the Baltic Sea is mainly of anthropogenic origin and originates in the same sources as the trace metals such as Cu, Pb and Zn.Keywords Aerosol · Selenium · TXRF · Baltic Sea Atmosphere B. Dudzińska-Huczuk ( ) Kashubian-Pomeranian College 84-200 Wejherowo ul.
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