Summary
Selenate can be detected by reduction to selenium with iron(II) in the presence of 5M hydrochloric acid. It can be distinguished from selenite (which gives the same reaction product) by first removing the latter by reduction to selenium with hydroxylamine.
Zusammenfassung
Selenat läßt sich in Gegenwart von 5-m Salzsäure durch Eisen(II) zu Selen reduzieren und damit nachweisen. Selenit (das ebenfalls zu Selen reduziert wird) kann man ausschließen, indem man es vorher mit Hydroxyl-amin reduziert.
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References
Midialands Association for Qualitative Analysis Semi-Micro Qualitative Analysis, Advanced Scheme. Birmingham: Stanford & Mann. 1964.
F. Feigl, Spot Tests in Inorganic Analyses, 5th Ed. Amsterdam: Elsevier. 1958. p. 351.
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Part XXXV, Mikrochim. Acta [Wien] 1968, 1277.
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Dowson, W.M. Studies in qualitative inorganic analysis. Part XXXVI. Mikrochim Acta 57, 202–205 (1969). https://doi.org/10.1007/BF01216685
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DOI: https://doi.org/10.1007/BF01216685