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- W1991320005 abstract "A comparison is made of a number of direct complexometric titrations previously published for the determination of yttrium and the lanthanons. Working and ‘optimum’ pH ranges are obtained for what are considered to be the best indicators. Alizarin Red S screened with Methylene Blue, Erioehrome Black T, Copper-Naphthyl Azoxine and Xylenol Orange. The precision and accuracy of the selected methods are determined by carrying out replicate titrations on standard solutions of ceriumIII, yttrium and ytterbium. The results, together with additional observations made on the behaviour of indicators in the different methods, suggest that Xylenol Orange at pH 5.8 to 6.4 is most satisfactory and convenient for direct titrations. Eine Anzahl früher für die Bestimmung von Yttrium und den Lanthaniden publizierter direkter komplexometrischer Titrationsmethoden wurden verglichen. Die besten pH-Arbeitsbereiche für die wahrscheinlich besten Indikatoren, Alizarin S mit Methylenblau, Eriochromschwarz T, Cu-Naphthylazoxin und Xylenol-orange wurden aulgesucht. Genauigkeit und Richtigkeit der Methode wurden mit mehreren Titrationen an Standardlösungen von Cer(III), Yttrium und Ytterbium ermittelt. Die Ergebnisse sprechen zusammen mit weiteren Beobachtungen über das Verhalten von Indikaroten bei den verschiedenen Methoden dafür, daß Xylenolorange bei pH 5,8 bis 6,4 in direkten Titrationen am zufriedenstellendsten und bequemsten arbeitet. On fait la comparaison des titrations complexométriques directes pour le dosage de l'yttrium et de les lanthanons. On décrit aussi les meillieures conditions ppur l'emploi des indicateurs choisies." @default.
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- W1991320005 date "1963-11-01" @default.
- W1991320005 modified "2023-10-09" @default.
- W1991320005 title "Complexometric titration of yttrium and the lanthanons—IA comparison of direct methods" @default.
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- W1991320005 doi "https://doi.org/10.1016/0039-9140(63)80170-8" @default.
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