Optical fibre reflectance sensors for the detection of heavy metal ions based on immobilised Br-PADAP

Optical fibre based reflectance sensors for the detection of heavy metal ions have been developed based on the use of the immobilised reagent Br-PADAP. Two methods of immobilisation, namely physical adsorption and membrane entrapment, have been employed and their relative merits have been discussed....

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 1998-08, Vol.51 (1), p.368-376
Main Authors: Vaughan, Andrew A., Narayanaswamy, Ramaier
Format: Article
Language:English
Subjects:
Heavy metals
Immobilised reagent
Optical sensor
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Summary:Optical fibre based reflectance sensors for the detection of heavy metal ions have been developed based on the use of the immobilised reagent Br-PADAP. Two methods of immobilisation, namely physical adsorption and membrane entrapment, have been employed and their relative merits have been discussed. Br-PADAP immobilised onto XAD-4 shows a reproducible and reversible response to heavy metal ions and a good limit of detection (31 ppb for Zn(II) with an analysis time of 6 min). Br-PADAP/PVC membranes show fairly quick and reproducible responses, but are irreversible. Br-PADAP/XAD-4 is proposed as a suitable reagent phase for use in a multi-metal ion sensor.
ISSN:0925-4005
1873-3077
DOI:10.1016/S0925-4005(98)00224-X