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A New Silver Ion-Selective Electrodes Based on Derivatized Multi-Walled Carbon Nanotubes as Neutral Carriers

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N1-(1-(pyridin-2-yl)ethylidene)ethane-1,2-diamine-multi-walled carbon nanotubes (PEED-MWCNTs), which derives from multi-walled carbon nanotubes and Schiff base, is fabricated and used as a novel ionophore in carbon paste electrodes (CPEs). The electrode, with optimum composition, exhibits a good Nernstian slope of 58.7 ± 0.3 mV decade−1 to Ag+ ion in the activity range 1.0 × 10−6 mol/L to 1.0 × 10−1 mol/L with a detection limit of 9.0 × 10−7 mol/L. Meanwhile, it also exhibits a good selectivity and a relatively fast response time (∼15 s), a long life time (2 months) and a wide pH range (3.0–8.0). The developed CPEs were successfully applied in the potentiometric titration of potassium bromide and determination of silver ions in tea water matrixes.


Document Type: Research Article


Publication date: 2012-01-01

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