Issue 5, 2012

Whole cell based amperometric sensor with relative selectivity for zinc ions

Abstract

A whole cell based amperometric biosensor was fabricated using unicellular microalgae Chlorella sp. as the biocatalyst, entrapped in a polymeric membrane directly interfaced to the surface of a platinum electrode for the detection of bioavailable heavy metal ions like zinc, copper, cadmium, cobalt and nickel with a life time of 7 days. The proposed system is sensitive to a lower concentration range of 10−9 M of nickel ions, 10−10 M of cadmium and cobalt ions, 10−11 M of copper and zinc ions. The amperometric biosensor responds to heavy metal ions with a relative selectivity in the order: Zn2+ > Cu2+ > Cd2+ > Co2+ > Ni2+. The proposed analytical method has been validated with atomic absorption spectroscopy for heavy metal detection in real time samples.

Graphical abstract: Whole cell based amperometric sensor with relative selectivity for zinc ions

Article information

Article type
Paper
Submitted
16 Dec 2011
Accepted
19 Mar 2012
First published
21 Mar 2012

Anal. Methods, 2012,4, 1326-1331

Whole cell based amperometric sensor with relative selectivity for zinc ions

J. Singh and S. K. Mittal, Anal. Methods, 2012, 4, 1326 DOI: 10.1039/C2AY05903G

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