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A solid-contact Pb2+-selective polymeric membrane electrode with Nafion-doped poly(pyrrole) as ion-to-electron transducer

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Abstract

Conducting polymer poly(pyrrole) (PPy) doped with Nafion was successfully used as ion-to-electron transducer in the construction of a solid-contact Pb2+-selective polymeric membrane electrode. The Nafion dopant can effectively increase the capacitance of the conducting polymer and improve the mechanical robustness of the coating. The transducer layer, PPy-Nafion, characterized by cyclic voltammetry and electrochemical impedance spectroscopy, exhibits a sufficiently high bulk (redox) capacitance and fast ion and electron transport process. The new Pb2+-selective polymeric membrane electrode, based on PPy-Nafion film as solid contact, shows stable Nernstian characteristics in Pb(NO3)2 solution within the concentration range of 1.0 × 10−7–1.0 × 10−3 M, and the detection limit is 4.3 × 10−8 M. The potential stability of the electrode and the influence of the interfacial water layer were also evaluated by chronopotentiometry and potentiometric water layer test, respectively. The results show that the solid-contact Pb2+-selective electrode, based on PPy-Nafion film as ion-to-electron transducer, can effectively overcome the potential drift and reduce the water layer between the PPy-Nafion transducer layer and the ion-selective membrane.

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Acknowledgments

This work was financially supported by the Chinese Academy of Sciences (KZCX2-YW-410), the National Natural Science Foundation of China (40776058), the National 863 High Technology Project of the Ministry of Science and Technology of China (2007AA09Z103), the Outstanding Youth Natural Science Foundation of Shandong Province (JQ200814), the Taishan Scholar Program of Shandong Province, the Natural Science Foundation of Shandong Province (2008ZRA06004), and the Science and Technology Development Project of Yantai City (2009164).

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Authors and Affiliations

  1. CAS and Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences (CAS), Yantai, 264003, People’s Republic of China

    Tanji Yin, Dawei Pan & Wei Qin

  2. South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, People’s Republic of China

    Tanji Yin

  3. Graduate School of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China

    Tanji Yin

  4. State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, People’s Republic of China

    Dawei Pan

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  1. Tanji Yin
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  2. Dawei Pan
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  3. Wei Qin
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Correspondence to Wei Qin.

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Yin, T., Pan, D. & Qin, W. A solid-contact Pb2+-selective polymeric membrane electrode with Nafion-doped poly(pyrrole) as ion-to-electron transducer. J Solid State Electrochem 16, 499–504 (2012). https://doi.org/10.1007/s10008-011-1358-z

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  • DOI: https://doi.org/10.1007/s10008-011-1358-z

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