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Issue 3, 1997
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Flow-injection Potentiometric Detection of Phosphates Using aMetallic Cobalt Wire Ion-selective Electrode


Flow-injection potentiometric detection of phosphate has been undertaken using a metallic cobalt wire ion-selective electrode. The electrode response to phosphate was characterised by potential readings of high stability versus a Ag/AgCl reference electrode, and results have shown that the electrode displays high sensitivity and selectivity towards the phosphate ion. The metallic cobalt wire electrode was used for the flow-injection potentiometric detection of phosphate using a 0.04 mol l - 1 potassium hydrogen phthalate carrier at pH 5.0. A linear response with a slope of -38.00 ± 0.5 mV decade - 1 change in phosphate activity was obtained in the range 1.0 × 10 - 5 –5.0 × 10 - 3 mol l - 1 , and the detection limit was 1 × 10 - 6 mol l - 1 . The phosphate electrode described in this paper is robust, simple to use, highly selective, inexpensive and highly stable.

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Article type: Paper
DOI: 10.1039/A700771J
Citation: Anal. Commun., 1997,34, 93-95
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    Flow-injection Potentiometric Detection of Phosphates Using a Metallic Cobalt Wire Ion-selective Electrode

    Z. Chen, R. De Marco and P. W. Alexander, Anal. Commun., 1997, 34, 93
    DOI: 10.1039/A700771J

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