Physikalische und physikochemische Methoden und Apparate in der Mikrochemie

Trace analysis of lanthanides by laser excitation of precipitates

“…The Gl site intensity was added to a fraction of the G4 site intensity. This fraction can be obtained by taking two standards that differ by a factor of ten in erbium concentration and making the following equality, Gl + aG4 = 10(Gl + aG4) (1) (sample 1) (sample 2) behaves like the other lanthanides under the influence of interferences, then its use could make SEPIL using calcium fluoride as the host lattice much less sensitive to interferences.…”

“…In chemical analysis, oxygen compensation of the valence mismatch between a trivalent rare earth and the CaF2 lattice is found to be superior to fluoride compensation in obtaining intense transitions (2). The intrinsic fluoride compensation of CaF2 is converted into oxygen compensation by igniting a CaF2 precipitate in air.…”

“…Selectively excited probe ion luminescence (SEPIL) has been shown to be a potentially useful technique in the determination of trace inorganic ions (1). Gustafson (2) and Gustafson and Wright (3) have developed a method for the determination of fluorescent rare earths by coprecipitation into CaF2. Fluorescence from a specific crystallographic site of a specific rare earth ion in the lattice can be selectively excited and monitored with a nitrogen laser pumped dye laser and a high resolution monochromator.…”