A spectrophotometric determination of europium in lanthanide and other mixtures by use of Methylene Blue.
A spectrophotometric determination of 0.1-1 mg of europium in a lanthanide(III) mixture is described. Europium(III) is selectively reduced in a Jones reductor and the europium(II) allowed to react with a measured excess of Methylene Blue (MB) solution. The dye is reduced to the colourless leuco form according to the equation, MB + 2 Eu(II)-->leuco MB + 2 Eu(III) and the excess of MB is determined spectrophotometrically at 664 nm. Optimum conditions are discussed and various applications presented.
Bhattacharya
S
S
The Chemical Laboratories, University of Kent at Canterbury, Canterbury, England.
Lyle
S J
SJ
Maghzian
R
R