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Fabrication of a Phosphate Ion Selective Electrode Based on Modified Molybdenum Metal

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Abstract

A phosphate ion-selective electrode using molybdenum metal was constructed. The modified molybdenum electrode responded to HPO42- in the presence of molybdenum dioxide and molybdophosphate (PMo12O403-) on the surface. The electrode exhibited a linear response to HPO42- in the concentration range between 1.0 × 10 5 and 1.0 × 10 1 M (mol dm−3) in the pH range from 8.0 to 9.5 with a detection limit of 1.0 × 10−6 M. The sensor showed near Nernstian characteristics (27.8 ± 0.5 mV dec−1) at pH 9.0. Since the responding potential was attributed to the activity of HPO42-, the potential at a given concentration of phosphate depended on the pH. The electrode indicated a good selectivity with respect to other common anions such as NO3-, SO42-, Cl-, HCO3- and CH3COO. The modified molybdenum electrode can be continuously used for over a 1 month with good reproducibility. The feasibility of the electrochemical sensor was proved by successful for the detection of phosphate in real samples.

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Authors and Affiliations

  1. Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo, Kyoto, 606-8502, Japan

    Kebin Xu, Yuki Kitazumi, Kenji Kano & Osamu Shirai

  2. Department of Nuclear Engineering, Graduate School of Engineering and Faculty of Engineering, Kyoto University, Nishikyo, Kyoto, 615-8530, Japan

    Takayuki Sasaki

Authors
  1. Kebin Xu
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  2. Yuki Kitazumi
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  3. Kenji Kano
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  4. Takayuki Sasaki
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  5. Osamu Shirai
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Correspondence to Osamu Shirai.

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Xu, K., Kitazumi, Y., Kano, K. et al. Fabrication of a Phosphate Ion Selective Electrode Based on Modified Molybdenum Metal. ANAL. SCI. 36, 201–205 (2020). https://doi.org/10.2116/analsci.19P296

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