Abstract
The absorption spectra of 4f electron transitions of the neodymium complex with 8-hydroxyquinoline and octylphenol poly(ethylene glycol)ether have been studied by conventional and third-derivative spectrophotometry. The absorption spectrum for neodymium at 575 nm is resolved into three bands centring at 572, 580 and 584 nm, respectively. The use of third-derivative spectra both eliminates the interference from other rare earth elements and enhances the sensitivity for neodymium. Beer's law is obeyed for 0–14 µg cm–3 of neodymium. The corresponding value of Sandell's sensitivity is 0.29 µg cm–2. The relative standard deviations evaluated from 11 independent determinations of 2.0 µg of neodymium are 0.87% for neodymium alone and 1.6% in the presence of 80 µg of lanthanum. The detection limit (signal-to-noise ratio = 2) is 0.12 µg cm–3 of neodymium. A method for the direct determination of neodymium in mixtures of rare earth elements with good accuracy and selectivity, is described.
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