Naslov
Determination of uranium in liquid samples

Autori
Rožmarić Mačefat, Martina ; Grahek, Željko ; Gojmerac Ivšić, Astrid

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Abstracts, IRPA 12, Strengthening Radiation Protection Worldwide / - Buenos Aires, 2008, 454-455

Skup
12th International Congress of the International Radiation Protection Association (IRPA 12)

Mjesto i datum
Buenos Aires, Argentina, 19.10.2008. - 24.10.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
uranium; thorium; TRU resin; ICP MS; spectrophotometry

Sažetak
Uranium is a natural occuring radionuclide and the first member of natural radioactive chains which makes its determination in natural materials interesting from geochemical and radioecological aspect. It can be quantitatively determined as element and/or its radioisotopes by different spectrometric methods (ICP-MS, spectrophotometry, alpha spectrometry). It is necessary to develop inexpensive, rapid and sensitive methods for the routine analysis. Therefore, in this paper, development of a new method for the isolation of uranium from liquid samples and subsequent determination by spectrophotometry and ICP-MS will be described. It is possible to isolate uranium from drinking and seawater using extraction chromatography or mixed solvent ion exchange. Uranium can be strongly bound on the TRU extraction chromatographic resin from nitric acid (chemical recovery is 100%) and can be separated from other interfering elements, while separation from thorium, which can be also strongly bound on this resin, is possible with hidrochloric acid. It is also possible to separate uranium from thorium on the anion exchanger Amberlite CG-400 (NO3- form) because uranium is much more weakly bound on this exchanger from alcoholic solutions of nitric acid. After the separation uranium is determined by ICP-MS and by spectrophotometric method with arsenazo III (λ max=652 nm). Developed method enables selection of the optimal mode of isolation for the given purposes.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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