Abstract
A preconcentration and determination method for thorium in aqueous solution with a tri-n-octylphosphine oxide modified glassy carbon electrode is proposed. In the presence of 2-thenoyltrifluoroacetone, thorium in NaAc-HAc supporting electrolyte is preconcentrated on a modified rotating disk electrode, and a highly sensitive reduction peak is obtained by cathodic stripping voltammetry at −1.10 V versus Ag/AgCl. A linear response of reduction peak height and concentration is observed for 1.15×10−9−1.44×10−8 mol·1−1 of thorium and the detection limit is 1.0×10−9mol·1−1. It is very selective and sensitive, with a standard deviation of 3.4% and a recovery of 90–110%.
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Jin, L.T., Shan, Y., Tong, W. et al. Determination of thorium by adsorptive type chemically modified electrode with a polycomplex system. Mikrochim Acta 97, 97–104 (1989). https://doi.org/10.1007/BF01197288
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DOI: https://doi.org/10.1007/BF01197288