Analise do cromo-51 em cromatos

AUTOR(ES)
DATA DE PUBLICAÇÃO

1979

RESUMO

ln the "hot atom" chemistry of chromates, difficulties exist in relating the chromium-51 labeled species measured by chemical analysis after dissolution with those species which are presumed to exist in the irradiated solíd. Reactions of the chromium-51 recoil atoms in the solid can, at present, only be inferred from changes in the distribution of the labeled species after dissolution. This has motivated us to develop two methods of analysis which involve dissolution in different non-aqueous solvents. A comparative study of various methods of analysis of recoil chromium-51 in chromates has indicated an influence of the pH of the dissolving solution and of the analysis on the observed distribution of the products. Samples of neutron irradiated (NH4)2Cr2O7 were subjected to isochronal thermal annealing, then analyzed using both normal (aqueous) and non-aqueous (DMSO and DMF) dissolution. The results show an increased quantity of Cr VI only above 100°C, resulting from oxidation of the Cr III monomer. Simultaneously, polymerization of the Cr III species occurs.

ASSUNTO(S)

processos quimicos analise cromatografica cromo

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