Third-derivative spectrophotometric determination of neodymium and erbium in mixed rare earths with 2-(diphenylacetyl)indan-1,3-dione and dodecyl benzenesulfonic acid sodium salt

Analyst Pub Date: DOI: 10.1039/AN9952002413

Abstract

The absorption spectra of 4f electron transitions of neodymium and erbium complexes with 2-(diphenylacetyl)indan-1,3-dione and dodecylbenzenesulfonic acid sodium salt have been studied by normal and derivative spectrophotometry. The use of third-derivative spectra both eliminates the interference from other REEs and enhances the sensitivity for neodymium and erbium. Beer's law is obeyed for ?21.6 μg cm–3 of neodymium and ?25.1 μg cm–3 of erbium. The detection limits (with a signal-to-noise ratio of 2) are 0.28 and 0.77 μg cm–3 for neodymium and erbium, respectively. A method for the direct determination of neodymium and erbium in mixed REEs and lanthanide–based samples with good accuracy and selectivity is described.

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