FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1978590933> ?p ?o ?g. }

• W1978590933 endingPage "157" @default.
• W1978590933 startingPage "129" @default.
• W1978590933 abstract "Geochemical and mineralogical studies of the 15- to 20-m-thick soil and saprolite profile developed over the Coles Hill uranium deposit demonstrate that uranium transport may be inhibited or naturally attenuated by the precipitation of U(VI) phosphate minerals in oxidizing and saturated soil environments. This study examines geochemical conditions in which these secondary uranium phosphates are formed and remain stable for hundreds of thousands of years. We also describe geochemical conditions that may lead to their dissolution. The lower part of the weathering profile, which consists of groundwater saturated saprolite, contains up to 1300 mg/kg uranium (within the solid). This concentration is approximately 1.5 times greater than the average ore grade of the deposit, indicating that the saturated saprolites are enriched relative to the underlying primary ore. Uranium within this zone is dominantly associated with U(VI) phosphates of the meta-autunite mineral group. Groundwaters from this zone contain less than 14 μg/l uranium suggesting that the U(VI) phosphate minerals present within the Coles Hill saprolites are capable of buffering dissolved uranium concentrations to values significantly lower (by a factor of 2 or more) than the US-EPA maximum contaminant level of 30 μg/l. Above the water table, U(VI) phosphates of the type found in the saturated saprolite zone are not present, and the soil uranium concentration drops to an average value of 250 mg/kg. Thus, the zone of water table fluctuation represents a major transition zone in uranium mineralogy. Mineralogical characterization of the upper part of the profile suggests that geochemical conditions in the unsaturated zone are not conducive to uranium stabilization by meta-autunite group minerals. Uranium within the vadose zone, however, is associated with phosphate (e.g. Al phosphate minerals and sorption with phosphate to ferric oxyhydroxides). As a whole, the Coles Hill soil profile is interpreted to have reached a steady state with respect to uranium transport and immobilization. Results of this study suggest that uranium is leached from the unsaturated part of the profile (meta-autunite unstable) and reprecipitated below the water table where the measured activity ratio of dissolved phosphate to carbonate is higher. Based on estimates of weathering rates for this region, the processes responsible for the dispersal of uranium within the Coles Hill system are estimated to have been active on a time scale of hundreds of thousands of years. This system thus represents an excellent natural laboratory for understanding the long-term mineralogical and geochemical processes involved in the coupling of uranium and phosphorus in natural, fluid-rich systems." @default.
• W1978590933 created "2016-06-24" @default.
• W1978590933 creator A5006425249 @default.
• W1978590933 creator A5033680570 @default.
• W1978590933 creator A5043041747 @default.
• W1978590933 date "2003-08-01" @default.
• W1978590933 modified "2023-10-01" @default.
• W1978590933 title "Natural immobilization of uranium by phosphate mineralization in an oxidizing saprolite–soil profile: chemical weathering of the Coles Hill uranium deposit, Virginia" @default.
• W1978590933 cites W13841476 @default.
• W1978590933 cites W1970131464 @default.
• W1978590933 cites W1980951511 @default.
• W1978590933 cites W1982487268 @default.
• W1978590933 cites W1995706097 @default.
• W1978590933 cites W2013123095 @default.
• W1978590933 cites W2024378050 @default.
• W1978590933 cites W2034363526 @default.
• W1978590933 cites W2038081055 @default.
• W1978590933 cites W2044933256 @default.
• W1978590933 cites W2052546009 @default.
• W1978590933 cites W2053431262 @default.
• W1978590933 cites W2054424460 @default.
• W1978590933 cites W2068212877 @default.
• W1978590933 cites W2073863738 @default.
• W1978590933 cites W2078288112 @default.
• W1978590933 cites W2078741827 @default.
• W1978590933 cites W2086709807 @default.
• W1978590933 cites W2095352076 @default.
• W1978590933 cites W2098301077 @default.
• W1978590933 cites W2123152408 @default.
• W1978590933 cites W2128872268 @default.
• W1978590933 cites W2152015161 @default.
• W1978590933 cites W2291220259 @default.
• W1978590933 cites W2352426508 @default.
• W1978590933 cites W2582451913 @default.
• W1978590933 doi "https://doi.org/10.1016/s0009-2541(03)00080-9" @default.
• W1978590933 hasPublicationYear "2003" @default.
• W1978590933 type Work @default.
• W1978590933 sameAs 1978590933 @default.
• W1978590933 citedByCount "66" @default.
• W1978590933 countsByYear W19785909332012 @default.
• W1978590933 countsByYear W19785909332013 @default.
• W1978590933 countsByYear W19785909332014 @default.
• W1978590933 countsByYear W19785909332015 @default.
• W1978590933 countsByYear W19785909332016 @default.
• W1978590933 countsByYear W19785909332017 @default.
• W1978590933 countsByYear W19785909332018 @default.
• W1978590933 countsByYear W19785909332019 @default.
• W1978590933 countsByYear W19785909332020 @default.
• W1978590933 countsByYear W19785909332021 @default.
• W1978590933 countsByYear W19785909332022 @default.
• W1978590933 countsByYear W19785909332023 @default.
• W1978590933 crossrefType "journal-article" @default.
• W1978590933 hasAuthorship W1978590933A5006425249 @default.
• W1978590933 hasAuthorship W1978590933A5033680570 @default.
• W1978590933 hasAuthorship W1978590933A5043041747 @default.
• W1978590933 hasConcept C107872376 @default.
• W1978590933 hasConcept C127313418 @default.
• W1978590933 hasConcept C147789679 @default.
• W1978590933 hasConcept C159390177 @default.
• W1978590933 hasConcept C159750122 @default.
• W1978590933 hasConcept C171699385 @default.
• W1978590933 hasConcept C17409809 @default.
• W1978590933 hasConcept C178790620 @default.
• W1978590933 hasConcept C185592680 @default.
• W1978590933 hasConcept C187320778 @default.
• W1978590933 hasConcept C191897082 @default.
• W1978590933 hasConcept C192562407 @default.
• W1978590933 hasConcept C199289684 @default.
• W1978590933 hasConcept C2777132085 @default.
• W1978590933 hasConcept C35391346 @default.
• W1978590933 hasConcept C40724407 @default.
• W1978590933 hasConcept C549924466 @default.
• W1978590933 hasConcept C555451288 @default.
• W1978590933 hasConcept C76177295 @default.
• W1978590933 hasConcept C82844589 @default.
• W1978590933 hasConcept C88380143 @default.
• W1978590933 hasConcept C90982505 @default.
• W1978590933 hasConceptScore W1978590933C107872376 @default.
• W1978590933 hasConceptScore W1978590933C127313418 @default.
• W1978590933 hasConceptScore W1978590933C147789679 @default.
• W1978590933 hasConceptScore W1978590933C159390177 @default.
• W1978590933 hasConceptScore W1978590933C159750122 @default.
• W1978590933 hasConceptScore W1978590933C171699385 @default.
• W1978590933 hasConceptScore W1978590933C17409809 @default.
• W1978590933 hasConceptScore W1978590933C178790620 @default.
• W1978590933 hasConceptScore W1978590933C185592680 @default.
• W1978590933 hasConceptScore W1978590933C187320778 @default.
• W1978590933 hasConceptScore W1978590933C191897082 @default.
• W1978590933 hasConceptScore W1978590933C192562407 @default.
• W1978590933 hasConceptScore W1978590933C199289684 @default.
• W1978590933 hasConceptScore W1978590933C2777132085 @default.
• W1978590933 hasConceptScore W1978590933C35391346 @default.
• W1978590933 hasConceptScore W1978590933C40724407 @default.
• W1978590933 hasConceptScore W1978590933C549924466 @default.
• W1978590933 hasConceptScore W1978590933C555451288 @default.
• W1978590933 hasConceptScore W1978590933C76177295 @default.
• W1978590933 hasConceptScore W1978590933C82844589 @default.
• W1978590933 hasConceptScore W1978590933C88380143 @default.

• next