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Proceedings Paper

Conducting polymer-based optical sensor for heavy metal detection in drinking water
Author(s): Sutapa Chandra; Soumyo Mukherji
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Paper Abstract

Polyaniline (PAni), the conducting polymer, has been investigated for decades, and has been explored extensively for electrochemical applications based on the fact that the conductivity and conformation of PAni changes with its protonation-deprotonation effects. We studied a phenomenon, i.e. change in the optical characteristics of PAni without explicit protonation or de-protonation, rather due to interaction of immunoglobulin (IgG) with heavy metal ions on its surface. The present study aims to incorporate PAni as a detection matrix to develop evanescent wave absorbance based fibre-optic sensor for detection of heavy metals in drinking water. Empirical study showed heat treated IgG exhibits more affinity towards heavy metal ions compared to native IgG. Binding of heavy metals (arsenic, lead, mercury and cadmium) to IgG showed spectroscopic alteration of PAni which was utilized to develop a cost-effective fibre-optic heavy metal sensor. The study was accomplished using an experimental set up consisting of a white light source, optical fiber and a spectrometer. The preliminary experiments were carried out with 10 ppb of arsenic, lead, mercury and cadmium and significant response was observed for each of the heavy metals. Interference of the sensor with other normal ions for e.g. potassium, sodium, magnesium, manganese, iron and zinc were also tested. The current investigation represents a significant step to fabricate highly sensitive optical

Paper Details

Date Published: 9 May 2018
PDF: 7 pages
Proc. SPIE 10680, Optical Sensing and Detection V, 106801A (9 May 2018); doi: 10.1117/12.2306719
Show Author Affiliations
Sutapa Chandra, Indian Institute of Technology Bombay (India)
Soumyo Mukherji, Indian Institute of Technology Bombay (India)

Published in SPIE Proceedings Vol. 10680:
Optical Sensing and Detection V
Francis Berghmans; Anna G. Mignani, Editor(s)

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