Titration methods oxidimetric

An indirect oxidimetric titration method for alkylhthium compounds may be carried out, taking advantage of the fact that vanadium pentoxide causes fast and complete oxidation of alkyllithiums in solution. After the end of this reaction the reduced vanadium compounds are dissolved in sulfuric acid and titrated with Ce(IV) sulfate, using as indicator Ee(II) and 1,10-phenanthroline (64) sulfate. This method is inadequate for aryllithium compounds because the lithium phenoxide impurities reduce vanadium pentoxide. ... 

The oxidimetric method, which involves the use of soUd vanadium pentoxide as oxidant (103). The vanadium is reduced quantitatively by butyUithium and is determined potentiometricaUy by titration with standard sulfatoceric acid [17106-39-7]. This method gives a direct measure of the actual carbon-bound lithium present when compared to the total titrated alkalinity. 

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