Abstract
In this article, the application of a novel modified screen-printed electrode (SPE) to thorium detection is described. Multi-walled carbon nanotubes (MWCNTs) modified screen-printed electrodes present an interesting alternative for the determination of thorium (IV). This method can be described by square wave adsorptive stripping voltammetry of the thorium complex with oxine at a screen printed electrode. In comparison with the bare SPE, the modifications of MWCNTs were demonstrated providing more sensitive responses. The pH adjusted to 3.0, and adsorptive voltammetric peak regarding the adsorption of thorium–oxine in the complex occur at −0.3V with adsorptive-preconcentration. The electrode displayed excellent linear behavior in the concentration range examined (0.5×10−9 to 2.2×10−8M) with a limit of quantitation (LOQ) of 0.5nM and limit of detection (LOD) by re-examining the data is 0.17nM. The method has been successfully applied to the determination of trace Th(IV) in different water samples.
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