Microdetermination of rare earth elements in their acetylpyridine N-oxide complexes by the oxine method after oxygen flask combustion

Abstract

Eleven rare earth elements (REE) were microdetermined after separation from the entity of two series of their acetylpyridine N-oxides complexes. This was performed by the oxine method after oxygen flask combustion in a single sample weight, applying gravimetric (I) and two titrimetric (II, III) procedures. This method has favorable gravimetric factors and sharp endpoints with 12-fold amplifications for titrimetric finish. The method gives an evidence and confirmation of the stoichiometric nature of these complexes. The calculated standard deviation ranges from 0.0208 to 0.0777 for the three combined procedures (I, II, and III). These procedures are more accurate and precise than complexometric and colorimetric methods applied for REE in such compounds.