FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2043221043> ?p ?o ?g. }

• W2043221043 endingPage "264" @default.
• W2043221043 startingPage "247" @default.
• W2043221043 abstract "Redox-reactive, biogeochemical phases generated by reductive microbial activity in hyporheic zone sediments from a dynamic groundwater–river interaction zone were evaluated for their ability to reduce soluble pertechnetate [99Tc(VII)O4−] to less soluble Tc(IV). The sediments were bioreduced by indigenous microorganisms that were stimulated by organic substrate addition in synthetic groundwater with or without sulfate. In most treatments, 20 μmol L−1 initial aqueous Tc(VII) was reduced to near or below detection (3.82 × 10−9 mol L−1) over periods of days to months in suspensions of variable solids concentrations. Native sediments containing significant lithogenic Fe(II) in various phases were, in contrast, unreactive with Tc(VII). The reduction rates in the bioreduced sediments increased with increases in sediment mass, in proportion to weak acid-extractable Fe(II) and sediment-associated sulfide (AVS). The rate of Tc(VII) reduction was first order with respect to both aqueous Tc(VII) concentration and sediment mass, but correlations between specific reductant concentrations and reaction rate were not found. X-ray microprobe measurements revealed a strong correlation between Tc hot spots and Fe-containing mineral particles in the sediment. However, only a portion of Fe-containing particles were Tc-hosts. The Tc-hot spots displayed a chemical signature (by EDXRF) similar to pyroxene. The application of autoradiography and electron microprobe allowed further isolation of Tc-containing particles that were invariably found to be ca 100 μm aggregates of primary mineral material embedded within a fine-grained phyllosilicate matrix. EXAFS spectroscopy revealed that the Tc(IV) within these were a combination of a Tc(IV)O2-like phase and Tc(IV)–Fe surface clusters, with a significant fraction of a TcSx-like phase in sediments incubated with SO42−. AVS was implicated as a more selective reductant at low solids concentration even though its concentration was below that required for stoichiometric reduction of Tc(VII). These results demonstrate that composite mineral aggregates may be redox reaction centers in coarse-textured hyporheic zone sediments regardless of the dominant anoxic biogeochemical processes." @default.
• W2043221043 created "2016-06-24" @default.
• W2043221043 creator A5010777390 @default.
• W2043221043 creator A5028050703 @default.
• W2043221043 creator A5028603269 @default.
• W2043221043 creator A5037864366 @default.
• W2043221043 creator A5046184555 @default.
• W2043221043 creator A5061290019 @default.
• W2043221043 creator A5073062396 @default.
• W2043221043 creator A5082347980 @default.
• W2043221043 date "2014-07-01" @default.
• W2043221043 modified "2023-10-14" @default.
• W2043221043 title "Fe(II)- and sulfide-facilitated reduction of 99Tc(VII)O4− in microbially reduced hyporheic zone sediments" @default.
• W2043221043 cites W1963872839 @default.
• W2043221043 cites W1965862312 @default.
• W2043221043 cites W1967918842 @default.
• W2043221043 cites W1986831510 @default.
• W2043221043 cites W1994821405 @default.
• W2043221043 cites W1995569174 @default.
• W2043221043 cites W2001222707 @default.
• W2043221043 cites W2009861384 @default.
• W2043221043 cites W2017233349 @default.
• W2043221043 cites W2020422599 @default.
• W2043221043 cites W2021320531 @default.
• W2043221043 cites W2021519829 @default.
• W2043221043 cites W2029116827 @default.
• W2043221043 cites W2046662802 @default.
• W2043221043 cites W2048386523 @default.
• W2043221043 cites W2050974249 @default.
• W2043221043 cites W2052734120 @default.
• W2043221043 cites W2053085449 @default.
• W2043221043 cites W2054604856 @default.
• W2043221043 cites W2054645658 @default.
• W2043221043 cites W2062716543 @default.
• W2043221043 cites W2076847158 @default.
• W2043221043 cites W2077277848 @default.
• W2043221043 cites W2080350388 @default.
• W2043221043 cites W2085348992 @default.
• W2043221043 cites W2091913250 @default.
• W2043221043 cites W2095346727 @default.
• W2043221043 cites W2095651856 @default.
• W2043221043 cites W2095745113 @default.
• W2043221043 cites W2107971248 @default.
• W2043221043 cites W2115250134 @default.
• W2043221043 cites W2117885339 @default.
• W2043221043 cites W2122989899 @default.
• W2043221043 cites W2134112845 @default.
• W2043221043 cites W2136980894 @default.
• W2043221043 cites W2140091778 @default.
• W2043221043 cites W2143781094 @default.
• W2043221043 cites W2144540011 @default.
• W2043221043 cites W2144668277 @default.
• W2043221043 cites W2144950249 @default.
• W2043221043 cites W2154242761 @default.
• W2043221043 cites W2154403829 @default.
• W2043221043 cites W2162849940 @default.
• W2043221043 cites W2486115935 @default.
• W2043221043 cites W4239505427 @default.
• W2043221043 doi "https://doi.org/10.1016/j.gca.2013.08.017" @default.
• W2043221043 hasPublicationYear "2014" @default.
• W2043221043 type Work @default.
• W2043221043 sameAs 2043221043 @default.
• W2043221043 citedByCount "37" @default.
• W2043221043 countsByYear W20432210432013 @default.
• W2043221043 countsByYear W20432210432014 @default.
• W2043221043 countsByYear W20432210432015 @default.
• W2043221043 countsByYear W20432210432016 @default.
• W2043221043 countsByYear W20432210432017 @default.
• W2043221043 countsByYear W20432210432018 @default.
• W2043221043 countsByYear W20432210432019 @default.
• W2043221043 countsByYear W20432210432020 @default.
• W2043221043 countsByYear W20432210432021 @default.
• W2043221043 countsByYear W20432210432022 @default.
• W2043221043 countsByYear W20432210432023 @default.
• W2043221043 crossrefType "journal-article" @default.
• W2043221043 hasAuthorship W2043221043A5010777390 @default.
• W2043221043 hasAuthorship W2043221043A5028050703 @default.
• W2043221043 hasAuthorship W2043221043A5028603269 @default.
• W2043221043 hasAuthorship W2043221043A5037864366 @default.
• W2043221043 hasAuthorship W2043221043A5046184555 @default.
• W2043221043 hasAuthorship W2043221043A5061290019 @default.
• W2043221043 hasAuthorship W2043221043A5073062396 @default.
• W2043221043 hasAuthorship W2043221043A5082347980 @default.
• W2043221043 hasConcept C107872376 @default.
• W2043221043 hasConcept C127313418 @default.
• W2043221043 hasConcept C138411078 @default.
• W2043221043 hasConcept C13965031 @default.
• W2043221043 hasConcept C147789679 @default.
• W2043221043 hasConcept C151730666 @default.
• W2043221043 hasConcept C178790620 @default.
• W2043221043 hasConcept C184651966 @default.
• W2043221043 hasConcept C185592680 @default.
• W2043221043 hasConcept C199289684 @default.
• W2043221043 hasConcept C2780596425 @default.
• W2043221043 hasConcept C2816523 @default.
• W2043221043 hasConceptScore W2043221043C107872376 @default.
• W2043221043 hasConceptScore W2043221043C127313418 @default.
• W2043221043 hasConceptScore W2043221043C138411078 @default.

• next