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Issue 5, 2012
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Whole cell based amperometric sensor with relative selectivity for zinc ions

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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

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Publication details

The article was received on 16 Dec 2011, accepted on 19 Mar 2012 and first published on 21 Mar 2012


Article type: Paper
DOI: 10.1039/C2AY05903G
Citation: Anal. Methods, 2012,4, 1326-1331
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    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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