Summary
The test commonly given using copper(II) sulphate solution to distinguish between pyro- and meta-vanadates has been examined and shown to be incorrect. The investigation has shown that the test can be used, and has established that the colours of the precipitates previously given should be reversed.
Zusammenfassung
Die übliche Reaktion für die Unterscheidung zwischen Pyro- und Metavanadat mit Hilfe von Kupfersulfat wurde als unzutreffend erwiesen. Man kann diese Reaktion zwar verwenden, aber die Färbung der dabei auftretenden Niederschläge ist für Metavanadat nicht grün, sondern gelb, für Pyrovanadat nicht gelb, sondern grün.
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References
R. K. McAlpine andB. A. Soule, Qualitative Analysis. London: Chapman & Hall. 1933. p. 393;A. I. Vogel, A Text Book of Macro- and Semimicro-Qualitative Inorganic Analysis, 4th London: Longmans. 1954. p. 594.
J. F. Hazel, W. M. McNabb, andR. J. Santini, J. Physic. Chem.57, 681 (1953).
J. W. Mellor, Comprehensive Inorganic Chemistry, Vol. IX. London: Longmans. 1929. p. 766. This reference also contains a summary of much previous work on various copper vanadates.
W. R. Schoeller andA. R. Powell, The Analysis of the Minerals and Ores of the Rarer Elements. London: Griffin. 1940. p. 178.
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Carter, A.H. Studies in qualitative inorganic analysis. Part XXXVIII. Mikrochim Acta 57, 1097–1099 (1969). https://doi.org/10.1007/BF01219254
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DOI: https://doi.org/10.1007/BF01219254