Investigation of a fibre optic copper sensor based on immobilised α-benzoinoxime (cupron)

Nikita Mahendra, Philomena Gangaiya, Subramaniam Sotheeswaran, Ramaier Narayanaswamy

    Research output: Contribution to journalArticlepeer-review


    α-Benzoinoxime, a highly selective reagent used for the gravimetric and colorimetric determination of copper, was successfully immobilised on XAD-2 and coupled with optical fibres to investigate a sensor-based approach for determining copper. Reflectance measurements were used to quantify sensor response. Optimum response was obtained at a wavelength of 560nm and at a solution pH of 7. Using a kinetic approach in which the rate of change of reflectance is measured over a 4-min period, the response was found to be linear in the range 5-127ppm. After measurement, the sensor can be regenerated for reuse by immersing the probe in 0.1M HCl. With continuous use, the sensing layer was found to be stable for at least 3 days. The advantages of using α-benzoinoxime in this way are compared with its use in the traditional gravimetric and colorimetric way. © 2003 Elsevier Science B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)118-123
    Number of pages5
    JournalSensors and Actuators B: Chemical: international journal devoted to research and development of physical and chemical transducers
    Issue number1-3
    Publication statusPublished - 20 Apr 2003


    • α-Benzoinoxime
    • Cupron
    • Fibre optic copper sensor


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