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۱Chromium(III) ion Selective PVC Membrane Electrode Based on a Schiff base Ligand, 3–Aminoacetophenonethiosemicarbazone
اطلاعات انتشار: Analytical & Bioanalytical Electrochemistry، سوم،شماره۲، Apri۲۰۱۱، سال
تعداد صفحات: ۱۵
An attempt has been made to develop a highly selective Cr3+–ion selective PVC membrane electrode based on a 5% newly synthesized 3 aminoacetophenonethiosemicarbazone as an ionophore with 62% DBP, 30% PVC and 3% NaTPB as an anion excluder. The electrode exhibits a near Nernstian potential response of 19.7±0.2 mV per decade over a wide concentration range (1.0×10–8 M to 1.0×10–1 M) with a detection limit of 7.4×10–8 between pH 1.5–6.8 with a fast response time (10 s). The selectivity coefficient values were determined by matched potential method (MPM), indicate higher selectivity for chromium(III) ion with improved performance as compared to other carriers reported earlier. The proposed electrode exhibits an adequate shelf life (14 weeks) without any considerable divergence in potentials. Further the electrode was also successfully applied to determine the content of chromium in water samples collected from different sites of river Yamuna in Delhi.

۲Perchlorate Selective PVC Membrane Electrode Based on Cobalt (II) Complex of
اطلاعات انتشار: Analytical & Bioanalytical Electrochemistry، سوم،شماره۴، Aug ۲۰۱۱، سال
تعداد صفحات: ۱۴
A new perchlorate selective poly(vinyl chloride) membrane electrode based on a cobalt(II) complex of p–Hydroxyacetophenonesemicarbazone as an ionophore was prepared. The electrode shows Nernstian slope of 59.6±0.3 mV\decade with improved linear range of 1.0×10–7 to 1.0×10–1 M, with a comparatively lower detection limit 5.4×10–8 M between pH range of 2.0–10, giving a relatively fast response within ≤8 s and can be used for at least 13 weeks without any divergence in potential. The selectivity coefficient was calculated using matched potential method. The electrode can also be used in partially non–aqueous media having up to 20% (v\v) methanol, ethanol or acetone content with no significant change in the value of slope or working concentration range. It was successfully applied for the direct determination of perchlorate content in water and human urine samples.
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