Abstract
The potentiometric properties of all-solid-state nitrate-selective electrodes based on plasticized PVC and containing different types of nanosized carbon black were investigated. The use of a carbon black interlayer is shown to significantly improve the potentiometric response. The electrodes display a close-to-Nernstian slope in the range from 10−1 to 10−6 M, highly stable potentials and low membrane resistance. However, different analytical features were found depending on the type of carbon black used. The best long-term potential stability was observed for the electrode with Printex XE2-B carbon black that has a relatively high BET surface area (1000 m2 · g−1) and an average particle size of 30 nm. Nevertheless, the electrodes with the Vulcan XC-72 (BET surface: 240 m2 · g−1; average size: 55 nm) showed the most repeatable and reproducible standard potential. The lowest detection limit for nitrate (2.5·10−7 M) is observed for an electrode containing Vulcan XC-72.
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Acknowledgement
The author is grateful to K. Skupień (3D-nano Co.) for stimulating discussion. This work was supported by NCBiR (No. LIDER/31/7/L-2/10/NCBiR/2011). W. Osiewala is acknowledged for improving the English text.
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Paczosa-Bator, B. Effects of type of nanosized carbon black on the performance of an all-solid-state potentiometric electrode for nitrate. Microchim Acta 181, 1093–1099 (2014). https://doi.org/10.1007/s00604-014-1216-7
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DOI: https://doi.org/10.1007/s00604-014-1216-7