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National Repository of Grey Literature

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Recoveries of elements following fast decomposition of biological and other materials by alkaline-oxidative fusion Kučera, Jan ; Krausová, Ivana Recoveries of selected elements were studied for fast decomposition of biological and other materials using alkaline-oxidative fusion in a mixture of NaOH and Na2O2 at 850 to 900°C. The procedure yields total mineralization of samples within 2 to 3 minutes. It is therefore especially suitable in radiochemical activation analysis (RAA) for determination of elements forming short-lived radionuclides. Recoveries of the elements F, Si, S, Cl, Ti, V, Mn, Ge, As, Br, Mo, Ru, In, Sb, I, Re, Os, and U determined using radiotracers were in the range 95-100 %, while those for Se and Hg were significantly lower and highly variable. Detailed record

Determination of lanthanides in agricultural crops by instrumental and radiochemical neutron activation analysis Mizera, Jiří ; Kučera, Jan ; Řanda, Zdeněk ; Vávrová, M. The lanthanide elements were measured in soils and agricultural crops collected in an area polluted by emissions from a phosphate fertilizer plant. Concentrations of lanthanides in the soil and crop samples were determined by instrumental neutron activation analysis (INAA). Selected crop samples were also analyzed using radiochemical neutron activation analysis (RNAA) based on alkaline-oxidative fusion of the irradiated samples followed by precipitation of REE oxalates. Elevated levels of lanthanides were found in some samples, especially in wheat chaff and parsley. Detailed record

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