Spectrophotometric study and analytical application of rare earth tiron complexes-I Determination of neodymium, holmium and erbium.
The absorption spectra of neodymium, holmium and erbium Tiron complexes in aqueous solution have been measured from 340 to 650 nm. The absorbance at the wavelength of maximum absorption band of an aqueous medium containing neodymium (pH 4.5), neodymium (pH 12.0), holmium (pH 5.0) and erbium (pH 5.0) Tiron complexes was about 4 (at 578 nm), 9 (at 571 nm), 9 (at 450 nm) and 5 (at 376 nm) times greater, respectively, than for the same quantities of the corresponding chlorides. The spectrophotometric determination of these elements has been investigated. Combining ratios of Tiron to rare earth have been found to be 3:2 and 2:1.
Taketatsu
T
T
College of General Education, Kyushu University, Fukuoka, Japan.
Toriumi
N
N