Limits...
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.

Show MeSH
SWV curves, recorded on a PDAN/CNT-modified electrode, for various Hg2+ concentrations (0.05–10 µM) and corresponding calibration curve (inset). Reprinted from [99] with permission from Elsevier.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4493548&req=5

biosensors-05-00241-f011: SWV curves, recorded on a PDAN/CNT-modified electrode, for various Hg2+ concentrations (0.05–10 µM) and corresponding calibration curve (inset). Reprinted from [99] with permission from Elsevier.

Mentions: Detection of Hg2+ was performed through preconcentration at open circuit potential followed by SWV. This sensor was specific for mercury because of the Hg2+/Hg22+ redox potential with respect to that of PDAN/CNT. Figure 11 presents the corresponding SWVs and calibration curve. The same group also demonstrated a new approach to fabricate CPs/CNTs hybrid using a mixture of Nafion® (DuPont, Wilmington, DE, USA) and MWCNTs first deposited on the electrode surface, followed by 1,5-DAN electropolymerization [100,101], for determination of Cd2+ and Pb2+ by SWASV over the range 4–150 µg·L−1 and LoDs of 3.2 and 2.1 µg·L−1 for Cd2+ and Pb2+, respectively.


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

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

SWV curves, recorded on a PDAN/CNT-modified electrode, for various Hg2+ concentrations (0.05–10 µM) and corresponding calibration curve (inset). Reprinted from [99] with permission from Elsevier.
© Copyright Policy
Related In: Results  -  Collection

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

biosensors-05-00241-f011: SWV curves, recorded on a PDAN/CNT-modified electrode, for various Hg2+ concentrations (0.05–10 µM) and corresponding calibration curve (inset). Reprinted from [99] with permission from Elsevier.
Mentions: Detection of Hg2+ was performed through preconcentration at open circuit potential followed by SWV. This sensor was specific for mercury because of the Hg2+/Hg22+ redox potential with respect to that of PDAN/CNT. Figure 11 presents the corresponding SWVs and calibration curve. The same group also demonstrated a new approach to fabricate CPs/CNTs hybrid using a mixture of Nafion® (DuPont, Wilmington, DE, USA) and MWCNTs first deposited on the electrode surface, followed by 1,5-DAN electropolymerization [100,101], for determination of Cd2+ and Pb2+ by SWASV over the range 4–150 µg·L−1 and LoDs of 3.2 and 2.1 µg·L−1 for Cd2+ and Pb2+, respectively.

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.

Show MeSH