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Modified electrodes used for electrochemical detection of metal ions in environmental analysis.

March G, Nguyen TD, Piro B - Biosensors (Basel) (2015)

Bottom Line: Many efforts have been made to develop sensors for monitoring heavy metals in the environment.The first part of this review will be dedicated to stripping voltammetry techniques, on unmodified electrodes (mercury, bismuth or noble metals in the bulk form), or electrodes modified at their surface by nanoparticles, nanostructures (CNT, graphene) or other innovative materials such as boron-doped diamond.Special attention will be paid to strategies using biomolecules (DNA, peptide or proteins), enzymes or whole cells.

View Article: PubMed Central - PubMed

Affiliation: Klearia, route de Nozay, Marcoussis 91460, France. gregory.march@free.fr.

ABSTRACT
Heavy metal pollution is one of the most serious environmental problems, and regulations are becoming stricter. Many efforts have been made to develop sensors for monitoring heavy metals in the environment. This review aims at presenting the different label-free strategies used to develop electrochemical sensors for the detection of heavy metals such as lead, cadmium, mercury, arsenic etc. The first part of this review will be dedicated to stripping voltammetry techniques, on unmodified electrodes (mercury, bismuth or noble metals in the bulk form), or electrodes modified at their surface by nanoparticles, nanostructures (CNT, graphene) or other innovative materials such as boron-doped diamond. The second part will be dedicated to chemically modified electrodes especially those with conducting polymers. The last part of this review will focus on bio-modified electrodes. Special attention will be paid to strategies using biomolecules (DNA, peptide or proteins), enzymes or whole cells.

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(A) Schematic representation of how Hg2+-imprinted MPMBT is obtained; (B) Typical SWASV of Hg2+ on an imprinted MPMBT. Preconcentration time: 8 min. Inset: calibration plot of the SWASV peak current vs. the Hg2+ concentration. Reprinted from [91] with permission from Elsevier.
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biosensors-05-00241-f009: (A) Schematic representation of how Hg2+-imprinted MPMBT is obtained; (B) Typical SWASV of Hg2+ on an imprinted MPMBT. Preconcentration time: 8 min. Inset: calibration plot of the SWASV peak current vs. the Hg2+ concentration. Reprinted from [91] with permission from Elsevier.

Mentions: Lastly, authors reported an innovative strategy using ion imprinting in electropolymerized poly(2-mercaptobenzothiazole) (MPMBT), for the detection of Hg2+ [91]. It consists of electropolymerization in presence of Hg2+, then removal of Hg2+ before the detection step (Figure 9A). SWASV on such Hg2+-imprinted MPMBT showed a LoD in the nM range (Figure 9B). They also showed that such electrode is insensitive to interferences for Pb2+, Cd2+, Zn2+, Cu2+ and Ag+.


Modified electrodes used for electrochemical detection of metal ions in environmental analysis.

March G, Nguyen TD, Piro B - Biosensors (Basel) (2015)

(A) Schematic representation of how Hg2+-imprinted MPMBT is obtained; (B) Typical SWASV of Hg2+ on an imprinted MPMBT. Preconcentration time: 8 min. Inset: calibration plot of the SWASV peak current vs. the Hg2+ concentration. Reprinted from [91] with permission from Elsevier.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493548&req=5

biosensors-05-00241-f009: (A) Schematic representation of how Hg2+-imprinted MPMBT is obtained; (B) Typical SWASV of Hg2+ on an imprinted MPMBT. Preconcentration time: 8 min. Inset: calibration plot of the SWASV peak current vs. the Hg2+ concentration. Reprinted from [91] with permission from Elsevier.
Mentions: Lastly, authors reported an innovative strategy using ion imprinting in electropolymerized poly(2-mercaptobenzothiazole) (MPMBT), for the detection of Hg2+ [91]. It consists of electropolymerization in presence of Hg2+, then removal of Hg2+ before the detection step (Figure 9A). SWASV on such Hg2+-imprinted MPMBT showed a LoD in the nM range (Figure 9B). They also showed that such electrode is insensitive to interferences for Pb2+, Cd2+, Zn2+, Cu2+ and Ag+.

Bottom Line: Many efforts have been made to develop sensors for monitoring heavy metals in the environment.The first part of this review will be dedicated to stripping voltammetry techniques, on unmodified electrodes (mercury, bismuth or noble metals in the bulk form), or electrodes modified at their surface by nanoparticles, nanostructures (CNT, graphene) or other innovative materials such as boron-doped diamond.Special attention will be paid to strategies using biomolecules (DNA, peptide or proteins), enzymes or whole cells.

View Article: PubMed Central - PubMed

Affiliation: Klearia, route de Nozay, Marcoussis 91460, France. gregory.march@free.fr.

ABSTRACT
Heavy metal pollution is one of the most serious environmental problems, and regulations are becoming stricter. Many efforts have been made to develop sensors for monitoring heavy metals in the environment. This review aims at presenting the different label-free strategies used to develop electrochemical sensors for the detection of heavy metals such as lead, cadmium, mercury, arsenic etc. The first part of this review will be dedicated to stripping voltammetry techniques, on unmodified electrodes (mercury, bismuth or noble metals in the bulk form), or electrodes modified at their surface by nanoparticles, nanostructures (CNT, graphene) or other innovative materials such as boron-doped diamond. The second part will be dedicated to chemically modified electrodes especially those with conducting polymers. The last part of this review will focus on bio-modified electrodes. Special attention will be paid to strategies using biomolecules (DNA, peptide or proteins), enzymes or whole cells.

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