Sorption of isosaccharinic acid, a cellulose degradation product, on cement

Article Abstract:

A study evaluated the effects of cellulose degradation products on the sorption of radioactive waste in a cementitious low- and intermediate-level radioactive waste (L/ILW) repository. A high portion of L/ILW is composed of cellulosic materials, which when subjected to the alkaline conditions can form water-soluble, low molecular weight compounds. Isosaccharinic acid is the primary product of cellulose degradation in the Ca2+ environment of cementitious radioactive waste repositories and can form stable complexes with tri- and tetravalent radionuclides, reducing the sorption of these radioactive wastes in the cement phase.

Waste Management and Remediation Services, Nuclear Environmental Control, Environmental aspects, Nuclear environmental management

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Speciation-dependent toxicity of neptunium(V) toward Chelatobacter heintzii

Article Abstract:

The growth of cultures of Chelatobacter heintzii was shown to be limited by the metal toxicity of aquo NpO2+ at free metal concentrations greater than 10(super-5)M, but neptunium concentrations below 10(super-4)M showed no observable limiting effects on C. heintzii, even when formed as a complex between neptunium and nitrilotriacetic acid or neptunium phosphate. The results show that speciation-dependent toxicity occurs only at neptunium concentrations above 10(super-4)M.

Microbial metabolism, Radioactive pollution

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The Aqueous Geochemistry of Neptunium: Dynamic Control of Soluble Concentrations with Applications to Nuclear Waste Disposal

Article Abstract:

Researchers found that neptunium, which is a small but very significant element within nuclear waste, is more stable in the environment than previously thought, which will make designing appropriate disposal methods more problematic. Tables and figures accompany the article.

United States, Science & research, Nuclear industry, Pollution, Radioactivity, Radioactive substances, Radioactive elements, Radioactive decay, Radioactive pollution of water, Radioactive water pollution

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