Neptunium Valence Adjustment through Photochemically Induced Redox Reactions at Low Concentrations
نویسندگان
چکیده
منابع مشابه
Geomicrobiological redox cycling of the transuranic element neptunium.
Microbial processes can affect the environmental behavior of redox sensitive radionuclides, and understanding these reactions is essential for the safe management of radioactive wastes. Neptunium, an alpha-emitting transuranic element, is of particular importance because of its long half-life, high radiotoxicity, and relatively high solubility as Np(V)O(2)(+) under oxic conditions. Here, we des...
متن کاملMineralogic controls on aqueous neptunium(V) concentrations in silicate systems
The presence of radioactive neptunium in commercially spent nuclear fuel is problematic due to its mobility in environmental systems upon oxidation to the pentavalent state. As uranium is the major component of spent fuel, incorporation of neptunium into resulting U(VI) mineral phases would potentially influence its release into environmental systems. Alternatively, aqueous neptunium concentrat...
متن کاملPhotochemically driven redox chemistry induces protocell membrane pearling and division.
Prior to the evolution of complex biochemical machinery, the growth and division of simple primitive cells (protocells) must have been driven by environmental factors. We have previously demonstrated two pathways for fatty acid vesicle growth in which initially spherical vesicles grow into long filamentous vesicles; division is then mediated by fluid shear forces. Here we describe a different p...
متن کاملA mixed-valence copper coordination polymer generated by hydrothermal metal/ligand redox reactions.
A novel coordination polymer of mixed-valence copper(I,II) with 4,4'-bipyridine and in situ oxidized isophthalate, [Cu2(ipO)(4,4'-bpy)] (ipOH = 2-hydroxyisophthalate), was hydrothermally synthesized and crystallographically characterized to be a laminated structure via weak copper(II)--oxygen interactions.
متن کاملChemical redox reactions induced by cryptoelectrons on a PMMA surface.
We show that pristine PMMA can spontaneously transfer electrons to species in a liquid, thereby inducing a variety of electron transfer reactions. The electrons that are transferred we call cryptoelectrons; these have a surface density of the order of 5 x 10(13) cm(-2) and are at a considerably more negative reduction potential than the PMMA bonding electrons. For example, metal ions including ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Nuclear Science and Technology
سال: 1989
ISSN: 0022-3131,1881-1248
DOI: 10.1080/18811248.1989.9734381