Determining Fluoride in Salts Using Capillary Zone Electrophoresis with Transient Isotachophoresois

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  • Fukushi Keiichi
    Kobe University, Graduate School of Maritime Sciences Kobe University, Biosignal Research Center
  • Tsujimoto Jun-ichi
    Maritime Disaster Prevention Center West Japan Regional Office （Kiso Chemical Analysis Center）
  • Hotta Hiroki
    Kobe University, Graduate School of Maritime Sciences
  • Okamura Hideo
    Kobe University, Graduate School of Maritime Sciences Kobe University, Research Center for Inland Seas
  • Inui Hideyuki
    Kobe University, Biosignal Research Center

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We applied transient isotachophoresis （tITP） and capillary zone electrophoresis （CZE） with indirect UV detection to determine F− in salts. The limit of detection （LOD, signal to noise ratio （S/N）＝3）） and limit of quantification （LOQ, S/N＝10） for F− respectively reached 0.007 and 0.023 mg/L using a capillary with larger inner diameter （100 μm）. The respective values of the relative standard deviation （RSD, n＝4） of the migration time, peak area, and peak height for F− were 0.35, 2.7, and 2.7 ％. Effects of coexisting components such as aluminum （Al3+）, iron （Fe3+）, magnesium （Mg2+）, and calcium （Ca2+） were examined. The adverse effects were resolved using metal complexation with diethylenetriamine pentaacetic acid （DTPA）. The proposed method was used to find F− in salt samples. Results for CZE agreed with those obtained using conventional spectrophotometry.

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