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Opis: Temporal and vertical variations in uranium (U) concentrations and U isotope (δ238U, ‰) signatures were examined in sediment cores collected seven times over a one year period, from two lakes in Ontario, Canada, which are contaminated with U by historical mining activities. Bow Lake is holomictic, experiencing seasonal anoxia, while the sediments of meromictic Bentley Lake are permanently anoxic. Average annual peak concentrations of U in Bow Lake subsurface sediments were approximately 300 μg L−1 and 600 μg g−1 in porewater and bulk sediments, respectively. Similar ranges of concentrations (900 μg L−1 and 600 μg g−1, respectively) were observed in Bentley Lake sediments. The exceedingly high levels of U observed in the porewaters of both lakes, as well as the seasonal variability in U levels, challenge the traditional paradigm regarding U chemistry, i.e., that reduced U(IV) should be insoluble under anoxic conditions. The average annual δ238U ‰ values at the sediment-water interface of both lakes were similar (i.e., 0.47 ± 0.09‰ and 0.50 ± 0.16‰, relative to IRMM-184). The deep sediments in both Bentley Lake and Bow Lake record U isotope composition with a typical fractionation of 0.6‰ relative to the surface water, confirming authigenic U accumulation, i.e., negligible contribution of particulate material from the tailings. Also, the δ238U values in porewater have an average offset of ca. −0.1‰ relative to bulk sediments in anoxic zones and are reversed in the oxic sediment layer.
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Povzetek najdenega: ...Uranium Isotope composition Uranium tailings Biogeochemical cycling Redox chemistry... ...levels, challenge the traditional paradigm regarding U chemistry, i.e., that reduced U(IV) should be insoluble under...
Ključne besede: Uranium Isotope composition Uranium tailings Biogeochemical cycling Redox chemistry
Objavljeno: 09.10.2019; Ogledov: 2384; Prenosov: 0
Polno besedilo (3,89 MB)

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Povzetek najdenega: ...calixarene, covalent polymers, redox chemistry, chemical switches...
Ključne besede: calixarene, covalent polymers, redox chemistry, chemical switches
Objavljeno: 03.09.2020; Ogledov: 1716; Prenosov: 0
Polno besedilo (373,43 KB)

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Povzetek najdenega: ...redox chemistry, viologen, covalent organic polymers, calixarene, dye adsorption,...
Ključne besede: redox chemistry, viologen, covalent organic polymers, calixarene, dye adsorption, iodine adsorption
Objavljeno: 11.09.2020; Ogledov: 1779; Prenosov: 0
Polno besedilo (2,11 MB)