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

研究成果: Contribution to journalArticle

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A nitrate ion-selective electrode (NO 3 - - ISE) has been developed based on tetradodecylammonium bromide as an anion exchanger and 2-nitrophenyl octyl ether as a plasticizer. The NO 3 - - 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 NO 3 - - 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 NO 3 - - ISE detector chip. The microfluidic polymer chip, integrated with a NO 3 - - ISE detector consisting of the NO 3 - - 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

元の言語英語
ページ(範囲)417-423
ページ数7
ジャーナルanalytical sciences
26
発行部数4
DOI
出版物ステータス出版済み - 4 2010

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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    Masadome, T., Nakamura, K., Iijima, D., Horiuchi, O., Tossanaitada, B., Wakida, S. I., & Imato, T. (2010). Microfluidic polymer chip with an embedded ion-selective electrode detector for nitrate-ion assay in environmental samples. analytical sciences, 26(4), 417-423. https://doi.org/10.2116/analsci.26.417