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

19 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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