Thermal stability and degradation kinetic study of white and colored cotton fibers by thermogravimetric analysis |
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Authors: | E Corradini E M Teixeira P D Paladin J A Agnelli O R R F Silva L H C Mattoso |
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Institution: | (1) Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;(2) Pacific Northwest National Laboratory, Richland, WA 99352, USA |
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Abstract: | Complexation of neptunium(V) with fluoride in aqueous solutions at elevated temperatures was studied by spectrophotometry
and microcalorimetry. Two successive complexes, NpO2F(aq) and NpO2F2−, were identified by spectrophotometry in the temperature range of 10–70°C. Thermodynamic parameters, including the equilibrium
constants and enthalpy of complexation between Np(V) and fluoride at 10–70°C were determined. Results show that the complexation
of Np(V) with fluoride is endothermic and that the complexation is enhanced by the increase in temperature — a two-fold increase
in the stability constants of NpO2F(aq) and more than five-fold increase in the stability constants of NpO2F2− as the temperature is increased from 10 to 70°C. |
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Keywords: | complexation fluoride neptunium temperature effect |
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