Summary
A method for titrimetric determination of lanthanum is proposed by oxidising lanthanum rhodizonate with ceric sulphate directly. A violet coloured complex is precipitated when the solution containing sodium rhodizonate and lanthanum nitrate is boiled. By analysis it appears that with one lanthanum three rhodizonates are attached. It is observed that Na+, K+, and Zr4+ do not interfere but Ag+, Cs+, Tl+, Be2+, Ca2+, Sr2+, Ba2+, Zn2+, Mg2+, Hg2+, Cu2+, Sn2+, Pd2+, Bi3+, Au3+, Sb3+, Al3+, Rh3+, Ru3+, Ir3+, Th4+, Te4+, Pt4+, Se6+, Cr6+, W6+, and U6+ do.
Zusammenfassung
Zur maßanalytischen Bestimmung von Lanthan wird die unmittelbare Oxydation von Lanthanrhodizonat mit Cer(IV)-sulfat vorgeschlagen. Beim Kochen einer Lösung von Natriumrhodizonat und Lanthannitrat fällt ein violett gefärbter Komplex aus. Aus der Analyse ergibt sich das Verhältnis La: Rhodizonat =1∶3. Na+, K+ und Zr4+ stören nicht im Gegensatz zu Ag+, Cs+, Tl+, Be2+, Ca2+, Sr2+, Ba2+, Zn2+, Mg2+, Hg2+, Cu2+, Sn2+, Pd2+, Bi3+, Au3+, Sb3+, Al3+, Rh3+, Ru3+, Ir3+, Th4+, Te4+, Pt4+, Se6+, Cr6+, W6+, und U6+.
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Pandey, J.D., Saxena, O.C. Titrimetric microdetermination of lanthanum. Mikrochim Acta 56, 636–638 (1968). https://doi.org/10.1007/BF01224076
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DOI: https://doi.org/10.1007/BF01224076