Andersson, P. S. and Porcelli, D. and Wasserburg, G. J. and Ingri, J. (1998) Particle transport of ^(234)U-^(238)U in the Kalix River and in the Baltic Sea. Geochimica et Cosmochimica Acta, 62 (3). pp. 385-392. ISSN 0016-7037. doi:10.1016/S0016-7037(97)00342-6. https://resolver.caltech.edu/CaltechAUTHORS:20131119-112504419
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Abstract
The role of particles for U isotope transport was investigated in the Kalix River watershed, a particle-poor, Fe/Mn-rich river in northern Sweden, and in the Baltic Sea estuary. Particles >0.45μm are strongly enriched in U and contain 20-50% of the total riverine uranium budget and <1% of the total U in brackish waters (3-7 PSU). The particles have high δ^(234)U which is close to that of dissolved U in the associated water, indicating that U on particles is dominantly nondetrital and isotopically exchanges rapidly with the ambient dissolved U. Particles at the river mouth are dominated by nondetrital Fe-Mn oxyhydroxides. Uranium and Fe are strongly correlated, clearly demonstrating that secondary Fe-oxyhydroxide is the major carrier of U in river water. There is no evidence for significant association of U with Mn-oxyhydroxide. Apparent U distribution coefficients (K_d^(Fe)) were calculated for U between the authigenic Fe on particles and the solution. These values appear to be relatively constant throughout the year. This suggests an equilibrium between Fe in solution and authigenic Fe-oxyhydroxides on detrital particles. High values of K_d^(Fe) calculated for one summer as well as high U concentrations in brackish waters can be explained by U scavenging by biogenic phases with low authigenic Fe content.
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| Additional Information: | © 1998 Elsevier Science Ltd. Received June 18, 1997; accepted in revised form September 24, 1997. This work was supported by Swedish Natural Science Research Council grants G/GU 06331-311 and G/GU 06331-312 to PSA and DOE grant DE-FG-03-88ER-13851. We thank the Swedish Meteorological and Hydrological Institute for allowing us to participate in the R/V Argos cruise. Magnus Hedberg gave us invaluable support. Reviews by J. Edmond and D. Turner significantly improved the manuscript. This is Div. Contr. No. 5695 (950). | |||||||||
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| Issue or Number: | 3 | |||||||||
| DOI: | 10.1016/S0016-7037(97)00342-6 | |||||||||
| Record Number: | CaltechAUTHORS:20131119-112504419 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20131119-112504419 | |||||||||
| Official Citation: | P.S Andersson, D Porcelli, G.J Wasserburg, J Ingri, Particle Transport of 234U-238U in the Kalix River and in the Baltic Sea, Geochimica et Cosmochimica Acta, Volume 62, Issue 3, February 1998, Pages 385-392, ISSN 0016-7037, http://dx.doi.org/10.1016/S0016-7037(97)00342-6. (http://www.sciencedirect.com/science/article/pii/S0016703797003426) | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 42569 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Ruth Sustaita | |||||||||
| Deposited On: | 19 Nov 2013 21:07 | |||||||||
| Last Modified: | 10 Nov 2021 16:25 |
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