Fluorimetric determination of scandium using the cyclodextrin-1,4-dihydroxyanthraquinone inclusion complex

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Abstract
Quinizarin (1,4-dihydroxyanthraquinone) and β-cyclodextrin (β-CD) form a 1 : 1 inclusion complex with an estimated association constant of 200 l mol–1 at pH 7.1. The hydrophobic nature of β-CD helps to dissolve and stabilise the dye and hence permits its use as a ligand in coordination reactions with metal ions. This inclusion compound has been used for the fluorimetric determination of trace amounts of scandium. A limit of detection of < 1 ng ml–1 of scandium was obtained with a relative standard deviation of 5%. The method was free from interferences from 40 species tested at concentration ratios below 1 : 1 m/m.

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