Potentiometric stripping determination of heavy metals with carbon fiber and gold microelectrodes

Barański, A.; Quon, H.H.

doi:10.1021/ac00293a032

Cited by 81 publications

(40 citation statements)

References 32 publications

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“…Mercury-coated metal microelectrodes [33] have been extensively used for anodic stripping voltammetry (ASV) of trace metal ions in aqueous solutions. [34][35][36][37][38][39][40] More recently, mercury microelectrodes have also been successfully employed as SECM tips to approach solid/solution interfaces to monitor various metal ions, including Zn 2 + , Cd 2 + , Pb 2 + , Cu 2 + , Mn 2 + , and Tl + . [41][42][43][44][45][46][47] Moreover, the functions to predict diffusioncontrolled steady-state currents [48] and approach curves at sphere-cap tips for both negative and positive feedback conditions are available.…”

Section: Introductionmentioning

confidence: 99%

In Situ Scanning Electrochemical Microscopy (SECM) Detection of Metal Dissolution during Zinc Corrosion by Means of Mercury Sphere‐Cap Microelectrode Tips

González-García

Battistel

Daniele

2011

Chemistry A European J

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This work presents a scanning electrochemical microscopy (SECM)‐based in situ corrosion probing methodology that is capable of monitoring the release of zinc species in corrosion processes. It is based on the use of Hg‐coated Pt microelectrodes as SECM tips, which offer a wider negative potential range than bare platinum or other noble‐metal tips. This allows for the reduction of zinc ions at the tip to be investigated with low interference from hydrogen evolution and oxygen reduction from aqueous solutions. The processes involved in the corrosion of zinc during its immersion in chloride‐containing solutions were successfully monitored by scanning the SECM tip, set at an adequate potential, across the sample either in one direction or in the X–Y plane parallel to its surface. In this way, it was possible to detect the anodic and cathodic sites at which the dissolution of zinc and the reduction of oxygen occurred, respectively. Additionally, cyclic voltammetry (CV) or constant potential measurements were used to monitor the release of zinc species collected at the tip during an SECM scan.

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Section: Introductionmentioning

confidence: 99%

In Situ Scanning Electrochemical Microscopy (SECM) Detection of Metal Dissolution during Zinc Corrosion by Means of Mercury Sphere‐Cap Microelectrode Tips

González-García

Battistel

Daniele

2011

Chemistry A European J

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“…L'électrode à film mince de mercure peut être formée sur plusieurs substrats tels que le platine [8,9], l'or [10] et des fibres du carbone [11,12]. Les électrodes à pâte de carbone (EPCs) sont souvent utilisées comme capteurs dans le domaine analytique [13,14].…”

Section: Introductionunclassified

Applications analytiques des films minces de mercure protégés par du fibrinogène pour la détermination du plomb et du cadmium dans des échantillons d’eaux usées et d’eaux de mer

Imane¹,

Mama²,

Aziz³

et al. 2010

Afrique Science: Revue Internationale Des Sciences Et Technologie

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RésuméL'objectif de ce travail est le développement d'un capteur électrochimique à base d'un film mince de mercure protégé par du fibrinogène (Fbg). La préparation, l'optimisation, la caractérisation et l'application des électrodes à film mince de mercure modifiées par du fibrinogène sont étudiées. L'électrode de travail est une électrode à pâte de carbone modifiée par simple adsorption du fibrinogène contenu dans une solution aqueuse en quantité adéquate. Le film de mercure est électrodéposé à des potentiels négatifs sur l'électrode modifiée. Les paramètres expérimentaux tels que la concentration du fibrinogène, le temps de déposition et le potentiel de préconcentration sont étudiés. Les performances de cette électrode sont ensuite évaluées pour la détermination simultanée du plomb et du cadmium en présence de différents surfactants tels que la gélatine, l'albumine, le SDS et le Tween 20. Les limites de détection obtenues sont de 5.10 Abstract Analytical application of fibrinogen-coated mercury film electrodes for the detection of lead and cadmium in water samplesThe aim of this study was the development of sensor based on fibrinogen (Fbg) coated mercury film electrodes at carbon paste electrode in the perspective of in-field stripping analysis of heavy metals in complex matrix. The preparation, optimization and characterization of coatings of Fibrinogen (Fbg) for the modification of thin mercury film electrodes and its application for the detection of trace metals have been described. The modified carbon paste electrode was prepared by a simple adsorption of fibrinogen from an aqueous solution containing an adequate quantity of fibrinogen. The Mercury film was then prepared by electrodeposition through the fibrinogen coating. The experimental parameters such as concentration of fibrinogen, deposition time and deposition potential were investigated. The performance of this electrode is evaluated in a presence of different surfactants such as gelatine, albumin, SDS and Tween 20, while lead and cadmium were employed as test metal ions. Using selected conditions the limits of detection were 5.10 for lead and cadmium, respectively. Since fibrinogen coated mercury film showed the best performance and increased efficiency against surfactants when comparing to the conventional mercury film, it was used for the analysis of trace metals in environmental samples of waters and industrial effluents.

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“…Among the electrodes used in ASV, the mercury film electrode (MFE) and hanging mercury drop electrode (HMDE) have gained most acceptance. One of the most important recent advances in ASV has been its coupling with ultramicroelectrode technology [2][3][4][5][6][7][8][9][10]. The use of microelectrodes in ASV is advantageous not only for microscale/microvolume measurements, but also for improving the plating efficiency (due to a greatly enhanced diffusional flux) and allowing assays of poorly conductive media (due to small ohmic drops).…”

Section: Introductionmentioning

confidence: 99%

“…The use of microelectrodes in ASV is advantageous not only for microscale/microvolume measurements, but also for improving the plating efficiency (due to a greatly enhanced diffusional flux) and allowing assays of poorly conductive media (due to small ohmic drops). Such advantages have been illustrated in connection with various microelectrode configurations, including microdisks [2], microcylinders [3,4], microbands [5], or microrings [6]. Arrays of multiple microelectrodes have also been employed for coupling the advantages of individual microelectrodes with significant larger (collective) current.…”

Section: Introductionmentioning

confidence: 99%

Anodic Stripping with Collection at Interdigitated Carbon Film Microelectrode Arrays

Wang¹,

Luo

Horiuchi

1998

Electroanalysis

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Interdigitated arrays of microband electrodes are used for highly sensitive anodic stripping with collection experiments. Compared to analogous experiments at rotating ring-disk electrodes, the interdigitated microelectrode array offers high collection efficiencies and the use of quiescent solutions. New lithographically fabricated carbon band microelectrodes, made by pyrolysis of 3,4,9,10-perylenetetracarboxylic dianhydride, are employed for supporting the mercury film. Metal cations stripped from one microband electrode diffuse across the narrow gap and are redeposited (collected) at the second electrode, kept at a suitable negative potential. The elimination of the charging current (accrued from the fixed collection potential) results in well-defined peaks, superimposed on a constant background, and hence in a greatly improved detectability. Experimental variables affecting the collection efficiency and the response, including the gap and scan rate, are examined.

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Potentiometric stripping determination of heavy metals with carbon fiber and gold microelectrodes

Cited by 81 publications

References 32 publications

In Situ Scanning Electrochemical Microscopy (SECM) Detection of Metal Dissolution during Zinc Corrosion by Means of Mercury Sphere‐Cap Microelectrode Tips

In Situ Scanning Electrochemical Microscopy (SECM) Detection of Metal Dissolution during Zinc Corrosion by Means of Mercury Sphere‐Cap Microelectrode Tips

Applications analytiques des films minces de mercure protégés par du fibrinogène pour la détermination du plomb et du cadmium dans des échantillons d’eaux usées et d’eaux de mer

Anodic Stripping with Collection at Interdigitated Carbon Film Microelectrode Arrays

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