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R. D. Marco, B. Peject and Z. Chen, “Flow Injection Potentiometric Determination of Phosphate in Waste and Fertilisers Using a Cobalt Wire Ion-Selective Electrode,” Analyst, Vol. 123, No. 7, 1998, pp. 1635-1640. doi:10.1039/a801244j

has been cited by the following article:

• TITLE: Electrodeposited Cobalt-Iron Alloy Thin-Film for Potentiometric Hydrogen Phosphate-Ion Sensor

  AUTHORS: Toru Kidosaki, Satoko Takase, Youichi Shimizu

  KEYWORDS: Hydrogen-Phosphate Ion Sensor; Cobalt-Iron Alloy; Thin-Film Electrode; Electrodeposition

  JOURNAL NAME: Journal of Sensor Technology, Vol.2 No.3, September 26, 2012

  ABSTRACT: A cobalt-iron alloy thin-film electrode-based electrochemical hydrogen-phosphate-ion sensor was prepared by electrodepositing on an Au-coated Al2O3 substrate from an aqueous solution of metal-salts. The use of a cobalt-iron alloy electrode greatly improved the hydrogen-ion sensor response performance, i.e., the sensor worked stably for more than 7 weeks and showed a quick response time of several seconds. Among the cobalt and iron alloy systems tested, the electrodeposited Co58Fe42 thin-film electrode showed the best EMF response characteristics, i.e., the sensor exhibited a linear potentiometric response to hydrogen-phosphate ion at the concentration range between 1.0 × 10–5 and 1.0 × 10–2 M with the slope of –43 mV/decade at pH 5.0 and at 30℃. A sensing mechanism of the Co-based potentiometric hydrogen-phosphate ion sensor was proposed on the basis of results of instrumental analysis.