Electrochemical Detection of As(III) via Iodine Electrogenerated at Platinum, Gold, Diamond or Carbon‐Based Electrodes

Hignett, Geraldine; Wadhawan, Jay D.; Lawrence, Nathan S.; Hung, Dang Quang; Prado, César; Marken, Frank; Compton, Richard G.

doi:10.1002/elan.200302903

Cited by 43 publications

(25 citation statements)

References 45 publications

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“…The difference in oxidation potential for iodide reported in Ref. [22] and in this work is therefore probably attributed to the characteristics of the diamond film used. Fig.…”

Section: Resultsmentioning

confidence: 61%

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Simultaneous detection of iodine and iodide on boron doped diamond electrodes

Fierro

Comninellis

Einaga

2013

Talanta

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a b s t r a c tIndividual and simultaneous electrochemical detection of iodide and iodine has been performed via cyclic voltammetry on boron doped diamond (BDD) electrodes in a 1 M NaClO 4 (pH 8) solution, representative of typical environmental water conditions. It is feasible to compute accurate calibration curve for both compounds using cyclic voltammetry measurements by determining the peak current intensities as a function of the concentration. A lower detection limit of about 20 mM was obtained for iodide and 10 mM for iodine. Based on the comparison between the peak current intensities reported during the oxidation of KI, it is probable that iodide (I À ) is first oxidized in a single step to yield iodine (I 2 ). The latter is further oxidized to obtain IO 3 À . This technique, however, did not allow for a reasonably accurate detection of iodate (IO 3 À ) on a BDD electrode.

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“…The difference in oxidation potential for iodide reported in Ref. [22] and in this work is therefore probably attributed to the characteristics of the diamond film used. Fig.…”

Section: Resultsmentioning

confidence: 61%

“…[22], that the oxidation of iodide on BDD occurs at lower potentials (around 0.6 V vs Ag/ AgCl) and is a quasi-reversible process.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous detection of iodine and iodide on boron doped diamond electrodes

Fierro

Comninellis

Einaga

2013

Talanta

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“…In the presence of As 3+ , the electrochemically generated I 2 is rapidly reduced to I -, in the "gap" between the disk and ring electrodes (eq.6). This results in a subsequent depletion in the concentration of I 2 arriving at the ring electrode [50]. Hence this reduction in the current collected at the ring electrode allows for the determination of the concentration of As 3+ introduced into the cell (eq.7).…”

Section: +mentioning

confidence: 99%

Screen-printed Electrochemical Sensors and Biosensors for Monitoring Metal Pollutants

Honeychurch¹

2012

Insciences J.

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Abstract:The present review (with 231 references) focuses on developments made in the area of screen-printed biosensors and sensors for the determination of metal ions in industrial, environmental and biomedical applications. The year 2012 represents the twentieth anniversary of the first reported application of screen-printed electrodes for the determination of metal ions. Focus is placed on fabrication techniques, operating details and performance characteristics for the selected applications. The greater proportion of articles have utilised the technique of stripping voltammetry, gaining detection limits in the low ng/mL (ppb) region. An increasing percentage of these have explored bismuth as an alternative to mercury for the modification of the carbon electrode surface. However, a steady number of applications have shown the possibility of utilising the unmodified screen-printed carbon, gold or silver electrode surface. More recently the alternative approach of electrochemical biosensors has become a growing area. The majority of these have exploited the inhabitation metal ions exhibit on the enzyme activity of urease, acetylcholinesterase and glucose oxidase gaining detection limits in the sub µg/mL region, however recent applications utilising thiol-functionalised oligonucleotides have been shown the possibility of gaining detection limits as low as 120 ng/L for Hg .

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“…However, As(III) is not oxidized in the potential window of aqueous solutions at the surface of a bare BDD electrode. Although a detection method with electrogenerated iodine at a BDD electrode in the presence of As(III) is feasible [57], the sensitivity is not very satisfactory. Arsenic (III) detection in 1 M HCl with a diamond thinfilm electrode modified by co-deposited gold particles provides a sensitivity of 0.01 A/ppb and linearity ranges from 0.005-40 ppb [58,59].…”

Section: Depositionmentioning

confidence: 99%

Analytical Tools for Monitoring Arsenic in the Environment

Luong¹,

Majid²,

Male³

2007

TOACJ

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Inorganic arsenic possesses the highest toxicity threat amongst all its forms found in natural groundwater and its mobility in aquatic systems and in the soil is of great environmental concern. Besides their toxicity to humans, arsenate and arsenite are highly toxic to plants. Arsenic can only be transformed into a less-toxic material and becomes a permanent part of the environment. Thus, there is a continuing need for its monitoring at arsenic-containing sites where it occurs naturally at elevated levels. This report reviews technologies with the potential to measure and monitor arsenic in the environment. However, we focus on the modern electrochemical methods of arsenic detection in drinking water. The pros and cons of such techniques are discussed with respect to their sensitivity, ability to detect the chemical states of arsenic, reliability, potential interferences, and ease of operation. In particular, emphasis has been devoted to more recent topics including modern stripping voltammetry, electrode modification, nanomaterials, and biosensors. The necessity for field instrumentation, detection and monitoring has also been addressed.

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Electrochemical Detection of As(III) via Iodine Electrogenerated at Platinum, Gold, Diamond or Carbon‐Based Electrodes

Cited by 43 publications

References 45 publications

Simultaneous detection of iodine and iodide on boron doped diamond electrodes

Simultaneous detection of iodine and iodide on boron doped diamond electrodes

Screen-printed Electrochemical Sensors and Biosensors for Monitoring Metal Pollutants

Analytical Tools for Monitoring Arsenic in the Environment

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