Determination of237Np in environmental samples using inductively coupled plasma mass spectrometry |
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| Authors: | Chang-Kyu Kim A Takaku M Yamamoto H Kawamura K Shiraishi Y Igarashi S Igarashi H Takayama N Ikeda |
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| Institution: | (1) Institute of Nuclear Energy Research, Nuclear Analytical Chemistry Center, 32500 Lung-Tan, Taiwan, (Republic of China);(2) Department of Chemistry, University of California, 92521 Riverside, CA, (USA) |
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| Abstract: | Ammonium uranates (AU) obtained by the addition of aqueous NH4 OH to a solution of UO2 (NO3)2 or the equilibrium reaction of UO3 · 2H2 O with the vapour over concentrated NH4 OH have been studied by X-ray diffraction (XRD) analysis, diffuse reflectance Fourier transform infrared spectrometry (DR-FTIR) and chemical analysis. Ammonia can be present as either NH3 or NH
4
+
. For precipitates obtained at a pH of 3.7, ammonia in the form of NH3 is predominant. For ammonium uranate obtained by reaction over concentrated NH4OH, most of the ammonia is bonded as NH
4
+
. The reaction mechanism and structures of the products are also discussed. |
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