Microfluidic polymer chip with an embedded ion-selective electrode detector for nitrate-ion assay in environmental samples

Takashi Masadome, Kazuki Nakamura, Daisuke Iijima, Osamu Horiuchi, Benjaporn Tossanaitada, Shin ichi Wakida, Toshihiko Imato

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    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 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. 2010

    Original languageEnglish
    Pages (from-to)417-423
    Number of pages7
    Journalanalytical sciences
    Volume26
    Issue number4
    DOIs
    Publication statusPublished - Apr 2010

    All Science Journal Classification (ASJC) codes

    • Analytical Chemistry

    Fingerprint

    Dive into the research topics of 'Microfluidic polymer chip with an embedded ion-selective electrode detector for nitrate-ion assay in environmental samples'. Together they form a unique fingerprint.

    Cite this