STUDY OF THE ABSORPTION-SPECTRA OF THE 4F ELECTRON TRANSITION OF THE ND AND ER COMPLEXES WITH 2-ISOBUTYLFORMYL-1,3-DIONE-INDANE IN THE PRESENCE OF TX-100 AND ITS ANALYTICAL APPLICATION

The absorption spectra of 4f electron transitions of the systems of ne odymium and erbium with 2-isobutylformyl-1,3-dione-indane and TX-100 h ave been studied by normal and derivative spectrophotometry. Their mol ar absorptivities at the maximum absorption bands are about 7.2. (at 5 71 nm) times greater for neodymium and 13.1 (at 519 nm) times greater for erbium than those in the absence of the complexing agents, Use of second derivative spectra both eliminates the interference from other rare earths and increases the sensitivity from neodymium and erbium. B eer's law is obeyed from 0 similar to 20 mu g/ml for neodymium and 0 s imilar to 25 mu g/ml for erbium. The relative standard deviations are 1.2% and 1.6% for 5.0 mu g/ml of neodymium and 8.0 mu g/ml of erbium, respectively., The detection limits (signal-to-noise ratio = 2) are 0. 14 mu g/ml and 0.20 mu g/ml. A method for the direct determination of neodymium and erbium in rare earth mixtures with good accuracy and sel ectivity is proposed.