Particle transport of U-234-U-238 in the Kalix River and in the Baltic Sea
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%...
| Päätekijät: | , , , |
|---|---|
| Aineistotyyppi: | Journal article |
| Julkaistu: |
1998
|
| _version_ | 1826306214355533824 |
|---|---|
| author | Andersson, P Porcelli, D Wasserburg, G Ingri, J |
| author_facet | Andersson, P Porcelli, D Wasserburg, G Ingri, J |
| author_sort | Andersson, P |
| collection | OXFORD |
| description | 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 δ234U 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 (K̂Fed) 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 K̂Fed 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. Copyright © 1998 Elsevier Science Ltd. |
| first_indexed | 2024-03-07T06:44:32Z |
| format | Journal article |
| id | oxford-uuid:fa6bd697-64d9-456a-a96f-8dcfeaf64a04 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T06:44:32Z |
| publishDate | 1998 |
| record_format | dspace |
| spelling | oxford-uuid:fa6bd697-64d9-456a-a96f-8dcfeaf64a042022-03-27T13:05:40ZParticle transport of U-234-U-238 in the Kalix River and in the Baltic SeaJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:fa6bd697-64d9-456a-a96f-8dcfeaf64a04Symplectic Elements at Oxford1998Andersson, PPorcelli, DWasserburg, GIngri, JThe 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 δ234U 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 (K̂Fed) 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 K̂Fed 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. Copyright © 1998 Elsevier Science Ltd. |
| spellingShingle | Andersson, P Porcelli, D Wasserburg, G Ingri, J Particle transport of U-234-U-238 in the Kalix River and in the Baltic Sea |
| title | Particle transport of U-234-U-238 in the Kalix River and in the Baltic Sea |
| title_full | Particle transport of U-234-U-238 in the Kalix River and in the Baltic Sea |
| title_fullStr | Particle transport of U-234-U-238 in the Kalix River and in the Baltic Sea |
| title_full_unstemmed | Particle transport of U-234-U-238 in the Kalix River and in the Baltic Sea |
| title_short | Particle transport of U-234-U-238 in the Kalix River and in the Baltic Sea |
| title_sort | particle transport of u 234 u 238 in the kalix river and in the baltic sea |
| work_keys_str_mv | AT anderssonp particletransportofu234u238inthekalixriverandinthebalticsea AT porcellid particletransportofu234u238inthekalixriverandinthebalticsea AT wasserburgg particletransportofu234u238inthekalixriverandinthebalticsea AT ingrij particletransportofu234u238inthekalixriverandinthebalticsea |