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Capillary zone electrophoresis determination of fluoride in seawater using transient isotachophoresis

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Abstract

We developed capillary zone electrophoresis (CZE) with indirect UV detection for the determination of fluoride (F−) in seawater using transient isotachophoresis (tITP) as an on-line concentration procedure. A method of correcting sample salinity effects was also proposed so that F− concentrations were obtained using a calibration graph. The proposed method is simple: it requires no sample pretreatment aside from dilution. The following optimum conditions were established: background electrolyte (BGE), 5 mM 2,6-pyridinedicarboxylic acid (PDC) adjusted to pH 3.5 containing 0.03% m/v hydroxypropyl methylcellulose (HPMC); detection wavelength, 200 nm; vacuum (50 kPa) injection period of sample, 5 s (254 nL); and applied voltage, 23 kV with the sample inlet side as the cathode. The limit of detection (LOD, S/N = 3) and limit of quantification (LOQ, S/N = 10) for F− reached 0.024 and 0.070 mg/L, respectively. The respective values of the relative standard deviation (RSD) of the peak area, peak height, and migration time for F− were 2.5, 3.4, and 0.30%. The proposed method was applied for the determination of F− in seawater samples collected from coastal waters of western Japan during August 26–28, 2014. Both results obtained using standard addition method and a calibration graph agreed with those obtained using a conventional spectrophotometric method.

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Acknowledgements

This work was in part supported by a Grant-in-Aid for Challenging Exploratory Research [grant number 25550064] from the Japan Society for the Promotion of Science for H. I.

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Authors and Affiliations

  1. Kobe University Biosignal Research Center, 1-1, Rokkodai-cho, Nada-ku, Kobe, Hyogo, 657-8501, Japan

    Keiichi Fukushi & Hideyuki Inui

  2. Kobe University Faculty of Maritime Sciences, 5-1-1 Fukaeminami-machi, Higashinada-ku, Kobe, Hyogo, 658-0022, Japan

    Yuki Fujita & Junpei Nonogaki

  3. Kiso Chemical Enterprises Ltd., 1 Maya-futo, Nada-ku, Kobe, Hyogo, 657-0854, Japan

    Jun-ichi Tsujimoto

  4. Kobe University Graduate School of Maritime Sciences, 5-1-1 Fukae-minamimachi, Higashinada-ku, Kobe, Hyogo, 658-0022, Japan

    Takanari Hattori, Hiroki Hotta & Mitsuru Hayashi

  5. University of Belgrade Faculty of Chemistry, Studentski trg 12-16, Belgrade, 11000, Serbia

    Vladimir P. Beškoski

  6. Osaka University Research Center for Environmental Preservation, 2-4 Yamadaoka, Suita, Osaka, 565-0871, Japan

    Takeshi Nakano

Authors
  1. Keiichi Fukushi
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  2. Yuki Fujita
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  3. Junpei Nonogaki
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  4. Jun-ichi Tsujimoto
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  5. Takanari Hattori
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  6. Hideyuki Inui
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  7. Vladimir P. Beškoski
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  8. Hiroki Hotta
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  9. Mitsuru Hayashi
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  10. Takeshi Nakano
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Correspondence to Keiichi Fukushi or Hideyuki Inui.

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Fukushi, K., Fujita, Y., Nonogaki, J. et al. Capillary zone electrophoresis determination of fluoride in seawater using transient isotachophoresis. Anal Bioanal Chem 410, 1825–1831 (2018). https://doi.org/10.1007/s00216-017-0838-0

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  • DOI: https://doi.org/10.1007/s00216-017-0838-0

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