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Particle transport of ^(234)U-^(238)U in the Kalix River and in the Baltic Sea

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.

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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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Wasserburg, G. J.0000-0002-7957-8029
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).
Funding AgencyGrant Number
Swedish Natural Science Research CouncilG/GU 06331-311
Swedish Natural Science Research CouncilG/GU 06331-312
Department of Energy (DOE)DE-FG-03-88ER-13851
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Caltech Division of Geological and Planetary Sciences5695
Lunatic Asylum Lab950
Issue or Number:3
Record Number:CaltechAUTHORS:20131119-112504419
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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, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42569
Deposited By: Ruth Sustaita
Deposited On:19 Nov 2013 21:07
Last Modified:10 Nov 2021 16:25

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