Uranium determination in seawater by total reflection X-ray fluorescence spectrometry |
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| Affiliation: | 1. Department of Translational Research, National Cancer Institute - CRO-IRCCS, Aviano, Italy;2. Doctoral School in Nanotechnology, University of Trieste, Italy;3. Doctoral School in Pharmacological Sciences, University of Padova, Italy;4. Amity Institute of Molecular Medicine & Stem Cell Research, Amity University, Noida, India;5. Department of Molecular Sciences and Nanosystems and Electron Microscopy Center “Giovanni Stevanato”, University Ca'' Foscari of Venezia, Italy;6. European Center of Living Technology, Venezia-Mestre, Italy;7. Doctoral School in Chemistry, University of Trieste, Italy;8. Department of Surgical, Oncological and Gastroenterological Sciences, Section of Surgery, University of Padova, Italy;9. Pediatric Research Institute, Città della Speranza, Padova, Italy;10. Department of Pharmacy, University of Pisa, Italy |
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| Abstract: | A study regarding uranium determination in seawater by total reflection X-ray fluorescence (TXRF) spectrometry is reported. Uranium, present in seawater in concentration of about 3.3 ng/mL, was selectively extracted in diethyl ether and determined by TXRF after its preconcentration by evaporation and subsequent dissolution in a small volume of 1.5% suprapure HNO3. Yttrium was used as an internal standard. Before using diethyl ether for selective extraction of uranium from seawater, its extraction behavior for different elements was studied using a multielement standard solution having elemental concentrations in 5 ng/mL levels. It was observed that the extraction efficiency of diethyl ether for uranium was about 100% whereas for other elements it was negligible. The detection limit of TXRF method for uranium in seawater samples after pre-concentration step approaches to 67 pg/mL. The concentrations of uranium in seawater samples determined by TXRF are in good agreement with the values reported in the literature. The method shows a precision within 5% (1σ). The study reveals that TXRF can be used as a fast analytical technique for the determination of uranium in seawater. |
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