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INORGANIC, ORGANIC, PHYSICAL
Titrimetric determination of thiocyanate in solutions of the hafnium-zirconium separation process
AND ANALYTICAL CHEMISTRY (1)
Vazquez, Cristina; Botbol, Moises; Hernandez, M.H. Comision Nacional de Energia Atomica, Buenos Aires (Argentina). Dept. de Quimica
Descriptors ANTITHYROID DRUGS (1) CARBONIC ACID DERIVATIVES (1) CHEMICAL ANALYSIS (1) 14 More Publication Year 1980 (1) Publication Year Range 1976 – 1980 (1) Country of publication Argentina (1) Language Spanish (1) INIS Volume 16 (1) INIS Issue 21 (1)
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[en] The control of the thiocyanate concentration is necessary during the process of separating hafnium from zirconium by the hexone-thiocyanate method. Said control is carried out by titrimetric determination of thiocyanate in aqueous and organic solutions containing hydrochloric acid and ammonium thiocyanate in presence or absence of zirconium and/or hafnium. The method consists in a redox volumetric analysis using a cerium (IV) salt as titrating agent, and ferroine as the final point indicator. Owing to the instability of thiocyanate in an acid medium it is necessary to know previously if the decomposition of solutions with different concentration of ammonium thiocyanate and hydrochloric acid may have an influence upon the analytic results or may even invalidate them. In order to obtain reliable results, it must be taken into account that the stability of the solutions depends on the thiocyanate concentration, the acidity and the time elapsed from the moment the sample is taken until the test is performed. The decomposition process can be slowed down by cooling the solutions. This method allows to control the plant and does not require any special equipment. (M.E.L) [es] En el proceso de dehafniado de circonio por la linea hexona-tiocianato es necesario controlar la concentracion de este ultimo. Dicho control se efectua por determinacion titrimetrica del tiocianato en soluciones acuosas y organicas que contienen acido clorhidrico y tiocianato de amonio en presencia o ausencia de circonio y/o hafnio. El metodo consiste en una volumetria redox empleando como agente titulante una sal de cerio (IV) y ferroina como indicador del punto final. Debido a la inestabilidad del tiocianato en medio acido es necesario conocer previamente si la descomposicion de soluciones con distinta concentracion de tiocianato de amonio y acido clorhidrico puede llegar a influir en los resultados analiticos o a invalidarlos. Para que los resultados sean confiables se debe tener en cuenta que la estabilidad de las soluciones depende de la concentracion del tiocianato, de la acidez y del tiempo transcurrido entre la toma de la muestra y el momento del analisis. El proceso de descomposicion se puede retardar por refrigeracion de las soluciones. Este metodo permite el control de planta y no requiere instrumental especial. (M.E.L) Original Title Primary Subject Source Record Type Report Number Country of publication Descriptors (DEI) Descriptors (DEC)
Language Reference Number Publication Year INIS Volume INIS Issue
Determinacion titrimetrica de tiocianato en soluciones de proceso de dehafniado de circonio INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY (B1100) 1980; 5 p; 9. Scientific meeting of the Argentine Association of Nuclear Technology; San Carlos de Bariloche (Argentina); 3-7 Nov 1980 Miscellaneous INIS-MF--10020 Argentina HAFNIUM, QUANTITATIVE CHEMICAL ANALYSIS, REDOX PROCESS, THIOCYANATES, TITRATION, ZIRCONIUM ANTITHYROID DRUGS, CARBONIC ACID DERIVATIVES, CHEMICAL ANALYSIS, DRUGS, ELEMENTS, METALS, ORGANIC COMPOUNDS, ORGANIC SULFUR COMPOUNDS, REPROCESSING, SEPARATION PROCESSES, TRANSITION ELEMENTS Spanish 16073738 1980 16 21
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