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AbstractAbstract
[en] Two methods are compared for the determination of water content in tetra-ammonium uranyl tricarbonate by the Karl Fischer reagent method. In the first method it is Known that the carbonate reacts stoichiometrically with the iodine content of the Karl Fischer reagent in the same way it reacts with the water (mole of apparent H2O per mole of carbonate is produced). In this case, the carbonate content in the sample is determined and a suitable correction is applied to take into account the apparent water results. In the second method it is performed an extraction of the moisture by adding methanol to the sample in an independent flask. After the decantation, an aliquot of the clear supernatant methanol is taken for the determination of water content by the Karl Fischer reagent method. (author)
[pt]
Comparam-se dois procedimentos para a determinacao do teor de agua em tricarbonato de amonio e uranilo (TCAU) utilizando-se o reagente de Karl Fischer. Em um deles assume-se que o carbonato reage estequiometricamente com o iodo presente no reagente de Karl Fischer de modo similar a agua (1 mol de carbonato equivale a 1 mol de agua). Assim, determina-se o teor de carbonato no TCAU e faz-se a correcao apropriada descontando-se o numero de moles de agua aparente do numero total de moles de agua obtido pelo metodo de Karl Fischer. No outro procedimento extrai-se a agua do TCAU com metanol em um recipiente independente, deixa-se em repouso para decantacao e pipeta-se uma aliquota do sobrenadante para ser analisada pelo metodo de Karl Fischer. (autor)Original Title
Determinacao do teor de agua em tricarbonato de amonio e uranilo (TCAU) pelo metodo de Karl Fischer
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Aug 1990; 17 p
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