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- Title
Determination of naturally occurring uranium concentrations in seawater, sediment, and marine organisms in Japanese estuarine areas.
- Authors
Takata, Hyoe; Aono, Tatsuo; Tagami, Keiko; Uchida, Shigeo
- Abstract
For safety assessments of geological repositories of nuclear waste, understanding of uranium (U) fate in estuarine areas is important because U chemical behavior in the areas is expected to be complex. Environmental transfer parameters such as sediment-water distribution coefficients ( K) and concentration ratios (CRs) for marine organisms are useful in mathematical models for the assessment. However, due to its low concentration in estuarine water, K and CF data for U are scarce. Thus we studied a rapid method for separation and concentration of U from estuarine water samples using NOBIAS-CHELATE PA1 resin columns followed by inductively coupled plasma mass spectrometry (ICP-MS) for U measurement. Chemical recovery was about 100% at pH of 5.7 ± 0.1 from the water samples and alkali and alkaline earth metals were removed. The method was used to measure U concentrations in estuarine water samples collected at eight Japanese estuarine areas; they ranged from 0.1 to 3.8 μg L. We also measured U concentrations in sediment and marine organism samples by ICP-MS after acid digestion. Using these values, we observed K (range: 39-284 L kg) and CRs (0.86-52 L kg for macroalgae, 0.087-15 L kg for crustaceans, and 0.52-93 L kg for molluscs).
- Subjects
URANIUM; SEAWATER; SEDIMENTS; MARINE organisms; ESTUARINE ecology; RADIOCHEMISTRY; WATER sampling
- Publication
Journal of Radioanalytical & Nuclear Chemistry, 2011, Vol 287, Issue 3, p795
- ISSN
0236-5731
- Publication type
Article
- DOI
10.1007/s10967-010-0827-7