Microfluidic Polymer Chip with an Embedded Ion-Selective Electrode Detector for Nitrate-Ion Assay in Environmental Samples

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  • MASADOME Takashi
    Department of Applied Chemistry, Faculty of Engineering, Shibaura Institute of Technology
  • NAKAMURA Kazuki
    Department of Applied Chemistry, Faculty of Engineering, Shibaura Institute of Technology
  • IIJIMA Daisuke
    Department of Applied Chemistry, Faculty of Engineering, Shibaura Institute of Technology
  • HORIUCHI Osamu
    Department of Applied Chemistry, Faculty of Engineering, Shibaura Institute of Technology
  • TOSSANAITADA Benjaporn
    Department of Applied Chemistry, Faculty of Engineering, Shibaura Institute of Technology
  • WAKIDA Shin-ichi
    Health Device Research Institute, Human Stress Signal Research Center (HSS), National Institute of Advanced Industrial Science and Technology (AIST)
  • IMATO Toshihiko
    Department of Applied Chemistry, Graduate School of Engineering, Kyushu University

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Abstract

A nitrate ion-selective electrode (NO3−-ISE) has been developed based on tetradodecylammonium bromide as an anion exchanger and 2-nitrophenyl octyl ether as a plasticizer. The NO3−-ISE shows an almost Nernstian response to nitrate ion over a concentration range between 1.0 × 10−6 and 1.0 × 10−1 M, with an anionic slope of −57.7 ± 0.7 mV/decade. The selectivity coefficients of the NO3−-ISE for nitrate ion against chloride and sulfate (log kpotNO<sub>3−Cl−</sub> = −2.42 and log kpotNO<sub>3−SO42−</sub> = −4.33) were obtained. A microfluidic polymer chip was fabricated using polystyrene plates and stainless-steel wires as a template for the channel. The microfluidic polymer chip is composed of a mixing chip and a NO3−-ISE detector chip. The microfluidic polymer chip, integrated with a NO3−-ISE detector consisting of the NO3−-ISE and a Na+-ISE as a reference electrode, showed an almost Nernstian response to nitrate ion over a concentration range between 1.0 × 10−5 and 1.0 × 10−1 M, with an anionic slope of −54.3 ± 1.3 mV/decade. The microfluidic polymer chip was then applied to the determination of nitrate ion in environmental water samples, such as a tap water, a well-water sample and water for agricultural use.

Journal

  • Analytical Sciences

    Analytical Sciences 26 (4), 417-423, 2010

    The Japan Society for Analytical Chemistry

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