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A rapid, simple and sensitive electrochemical sensor based on glassy carbon electrode modified with tin oxide nanoparticles @ multiwalled carbon nanotubes have been used for determination of trace Hg(II) and Tl(I) using the square wave anodic stripping voltammetric (SWASV) technique. Under optimized condition, the limit of detection and quantification ranged from 0.9−1.2 ng L −1 and 3.3-4.0 ng L −1 , respectively. The inter-day (n=10) and intra-day (n=7) precisions expressed in relative standard deviations at 50 μg L −1 of Hg(II) and Tl(I) ranged from 2.1-3.5 and 3.0-4.3%, respectively. The GCE/SnO2@MWCNTs was applied for the determination of the target trace elements in thirteen surface water samples. The accuracy of analytical results obtained using the developed electrochemical sensor was comparable to those obtained by the ICP-MS.

international journal of electrochemical science

Square Wave Anodic Stripping Voltammetry for Simultaneous Determination of Trace Hg (II) and Tl(I) in Surface Water Samples Using SnO2@MWCNTs Modified Glassy Carbon Electrode