Abstract
A fourth-derivative spectrophotometric procedure is described for the determination of neodymium in mixed rare earths. It is based on the absorption spectrum of the 4f electron transition of the neodymium complex with bromopyrogallol red (BPR) in the presence of TX-100. The influence of various instrumental parameters and reaction conditions on the colour development of the Nd-BPR-TX-100 complex has been investigated. The detection limit is 0.15 μg/mL and the linear dynamic range extends to 3.6 μg/mL. The relative standard deviation is 1.2% for 1.5 μg/mL (n=7). Satisfactory results were obtained.
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