Adsorptive Stripping Determination of Scandium(III) with Mordant Blue 9 on Silver Amalgam Film Electrode |
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Authors: | Robert Piech |
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Institution: | Faculty of Materials Science and Ceramics, AGH University of Science and Technology, 30‐059 Kraków, al. Mickiewicza 30, Poland |
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Abstract: | A new adsorptive stripping voltammetric method for the determination of trace scandium(III) based on the adsorption of scandium(III)‐mordant blue 9 complex on the cyclic renewable mercury film silver based electrode (Hg(Ag)FE) is presented. The effects of various factors such as: preconcentration potential and time, pulse height, step potential and supporting electrolyte composition are optimized. The calibration graph is linear from 2 nM (0.09 μg L?1) to 90 nM (4 μg L?1) for a preconcentration time of 45 s, with correlation coefficient of 0.9995. For a Hg(Ag)FE with a surface area of 7.9 mm2 the detection limit for a preconcentration time of 90 s is as low as 5 ng L?1. The repeatability of the method at a concentration level of the analyte as low as 0.2 μg L?1, expressed as RSD is 1.9 % (n=5). The proposed method was successfully applied and validated by studying the certified reference material (CRM 320 – river sediment) and natural samples with simultaneous recovery of Sc(III) from spiked water and sediment samples. |
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Keywords: | Scandium Mordant blue 9 Trace analysis Silver amalgam film electrode Stripping voltammetry |
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