Ultratrace-level radium-226 determination in seawater samples by isotope dilution inductively coupled plasma mass spectrometry |
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Authors: | Zsolt Varga |
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Affiliation: | (1) Radiation Safety Department, Institute of Isotopes, Hungarian Academy of Sciences, Konkoly-Thege utca 29-33, 1121 Budapest, Hungary |
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Abstract: | An improved and novel sample preparation method for 226Ra determination in liquid samples by isotope dilution inductively coupled plasma sector field mass spectrometry using laboratory-prepared 228Ra tracer has been developed. The procedure involves a selective preconcentration achieved by applying laboratory-prepared MnO2 resin followed by cation exchange chromatographic separation. In order to completely eliminate possible molecular interferences, medium mass resolution (R = 4,000) combined with chemical separation was found to be a good compromise that enhanced the reliability of the method. The detection limit of 0.084 fg g−1 (3.1 mBq kg−1) achieved is comparable to that of the emanation method or alpha spectrometry and is suitable for low-level environmental measurements. The chemical recovery of the sample preparation method ranged from 72 to 94%. The proposed method enables a rapid, accurate and less labor-intensive approach to routine environmental 226Ra determination than the radioanalytical techniques conventionally applied. |
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Keywords: | Radium Inductively coupled plasma mass spectrometry Liquid samples Seawater Environmental analysis |
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