Neutron activation analysis for chromium(III) and (VI) in lixiviated liquid through a calcined chromium(VI) adsorbed hydrotalcite |
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Authors: | S. Martínez-Gallegos S. Bulbulian |
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Affiliation: | (1) Instituto Nacional de Investigaciones Nucleares; Facultad de Ciencias, Universidad Autónoma del Estado de México, A.P.18-1027. Col. Escandón, Delegación Miguel Hidalgo, C.P. 11801, México D. F., Mexico; Instituto Literario no. 100 Col. Centro, Toluca, Edo. de México, C.P. 50000, Mexico;(2) Instituto Nacional de Investigaciones Nucleares, A.P.18-1027. Col. Escandón, Delegación Miguel Hidalgo, C.P. 11801, México D. F., Mexico |
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Abstract: | Summary Electrophoresis followed by neutron activation analysis was utilized to determine chromium(III) and (VI) in mixed solutions. These solutions proceeded from Cr(VI) adsorbed hydrotalcites heated at 800 °C to partially immobilize Cr in the Mg-Al oxide solid solution. Immobilization was studied by Cr lixiviation with NaCl solutions through the heated hydrotalcites. The results have shown that Cr lixiviated was in the form of CrO42- ions, mainly because some Cr(VI) was not completely reduced to Cr(III) during heating. Chromium lixiviated from HT-Cr sample, heated at 800 °C and γ-irradiated at 1000 kGys, was found, as well, in the form of CrO42- ions. Although γ-irradiation increases Cr immobilization in the solid, it does not reduce completely all CrO42- ions present in the solid and, therefore, some Cr is lixiviated through the solid in the form of CrO42- ion. |
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