A direct analysis of nanomolar metal ions in environmental water samples with Nafion-coated microelectrodes

Hong Jeong Kim, Kwang Seok Yun, Euisik Yoon, Juhyoun Kwak

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Square Wave Anodic Stripping Voltammetry (SWASV) was combined with microfabricated microelectrodes to analyze metal ions in aqueous solution and showed excellent performance such as short analysis time about 1 min per experiment, simultaneous detection of several ions and very low detection limit as low as several nanomoles per liter (i.e. sub-ppb in mass) without any of supporting electrolyte and stirring during analysis. Nafion, a famous ion-exchanging polymer, was introduced to protect the electrode surface from obstructing materials. The Nafion-coated microelectrode was free from disturbing impurities and was capable of analyzing natural water samples directly. Results from the direct water analysis showed similar performance to those from pre-treated samples in both sensitivity and analysis time. To secure the reproducibility of Nafion-coated electrode, a simple electrochemical cleaning method with potential sweep was used and the electrode remained reliable to continued experiments. Nafion-coated microelectrodes were further examined via the comparison with ICP-MS data.

Original languageEnglish
Pages (from-to)205-210
Number of pages6
JournalElectrochimica Acta
Issue number1
Publication statusPublished - 2004 Nov 15

Bibliographical note

Funding Information:
This work was partially supported by the Brain Korea 21 project and the Korea Science and Engineering Foundation through MICROS center at KAIST.

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry


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