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۱Taguchi OA25 Orthogonal Array Design for the Optimization of La3+–Selective Electrode Prepared by Sol–gel Technique
نویسنده(ها): ،
اطلاعات انتشار: Analytical & Bioanalytical Electrochemistry، چهارم،شماره۴، Aug ۲۰۱۲، سال
تعداد صفحات: ۱۳
A sol–gel electrode, based on ethyl 1,2,3,4–tetrahydro–6–methyl–4–phenyl–2– thioxopyrimidine–5–carboxylate (ETMPTC) as a neutral ionophore, was successfully developed for the detection of La3+ in aqueous solutions. The electrode responds to La + ion with a sensitivity of 19.7±0.1 mV\ decade over the range 1.0×10−8–1.0×10−1 M and in a pH range of 3.0–10.0. The sol–gel electrode shows detection limit of 3.5×10−9 M. The influence of membrane composition, the pH of the test solution, and the interfering ions on the electrode performance was investigated. The proposed electrode shows good discrimination of La3+ ion from several cations. The effect of temperature on the electrode response showed that the temperature higher than 65°C deteriorates the electrode performance. The electrode was found to work well under laboratory conditions. This sensor not only was used as an indicator electrode in potentiometric titration of lanthanum ion against EDTA but also was used to determination of La3+ concentration in the presence of certain interfering ions.

۲Rapid Differential Pulse Voltammetric Determination of Galantamine on the Simple Glassy Carbon Electrode; Alternative for the Standard Methods
اطلاعات انتشار: Analytical & Bioanalytical Electrochemistry، پنجم،شماره۲، Apr ۲۰۱۳، سال
تعداد صفحات: ۱۰
The electrochemical behavior of Galantamine (Gal) in aqueous media has been examined by cyclic and differential pulse voltammetry. The voltammograms were recorded with μA utolab FRA2 Potentiostat–Galvanostat. A three–electrode system was used with a glassy carbon as working electrode, a platinum rod as the counter electrode and an Ag\AgCl as the reference electrode. All tests were carried out under room temperature and N2 atmosphere. The pH strongly affects the peak potential of Gal. The best analytical response was obtained at pH 2.0. The cathodic peak currents were proportional to Gal concentrations in the range of 0.1–10 mM under the optimized experimental conditions. The detection limit was 0.02 mM. The effect of potential scan rate on the peak potential and peak current of Gal was investigated. The correlation of the peak currents against v1\2 (v is the scan rate) is linear, which is very similar to a diffusioncontrolled process. Proposed method applied to analysis of commercial tablets, successfully.
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