Determination of thorium by adsorptive type chemically modified electrode with a polycomplex system |
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Authors: | Li -Tong Jin Ying Shan Wei Tong Yu -Zhi Fang |
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Institution: | (1) Department of Chemistry, East China Normal University, 3663 Chung Shan Road (N), Shanghai, People's Republic of China |
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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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Keywords: | chemically modified electrode determination of trace thorium cathodic stripping voltammetry differential pulse voltammetry |
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