The electrochemical reaction mechanism of arsenic deposition on an Au(111) electrode

Jia, Zheng; Simm, Andrew O.; Xuan, Dong; Compton, Richard G.

doi:10.1016/j.jelechem.2005.11.017

Cited by 51 publications

(48 citation statements)

References 45 publications

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“…Therefore, the obtained results indicate that the reduction of As(III) to As (0) and the oxidation of As (0) to As(III) are a diffusion-controlled and surface-confined processes, respectively, i.e., the reduction of As(III) requires 3 electrons to be deposited as As(0) onto the Au nanoparticle surface of the nano-Au/GC electrode, whereas the As(0) is oxidized to As(III) during the anodic scan. These observations are in a good agreement with the results obtained previously for the As(III) using bulk Au and Au nanoparticle-modified GC electrodes [36,38,44]. Figure 2 shows the typical linear sweep voltammograms (LSVs) measured at a nano-Au/GC electrode (E1) in N 2 -saturated 3 M HCl solutions without and with 5 mM As(III).…”

Section: Instrumentation and Proceduressupporting

confidence: 90%

“…Comptons group [36] has first employed the Au nanoparticle-modified glassy carbon (GC) (nano-Au/GC) electrode that has been prepared via the electrochemical deposition method for the detection of As(III). They have also studied the mechanism of arsenic deposition on an Au(111) single crystalline electrode [38]. Majid et al have developed a flow analysis system using nano-Au/GC for the detection of As(III) with a LOD of 0.25 ppb [39] (Table 1).…”

Section: Introductionmentioning

confidence: 99%

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Anodic Stripping Voltammetric Detection of Arsenic(III) at Gold Nanoparticle‐Modified Glassy Carbon Electrodes Prepared by Electrodeposition in the Presence of Various Additives

et al. 2008

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The simple, fast and highly sensitive anodic stripping voltammetric detection of As(III) at a gold (Au) nanoparticlemodified glassy carbon (GC) (nano-Au/GC) electrode in HCl solution was extensively studied. The Au nanoparticles were electrodeposited onto GC electrode using chronocoulometric technique via a potential step from 1.1 to 0 V vs. Ag j AgCl j NaCl (sat.) in 0.5 M H 2 SO 4 containing Na [AuCl 4 ] in the presence of KI, KBr, Na 2 S and cysteine additives. Surfaces of the resulting nano-Au/GC electrodes were characterized with cyclic voltammetry. The performances of the nano-Au/GC electrodes, which were prepared using different concentrations of Na[AuCl 4 ] (0.05 -0.5 mM) and KI additive (0.01 -1.0 mM) at various deposition times (10 -30 s), for the voltammetric detection of As(III) were examined. After the optimization, a high sensitivity of 0.32 mA cm À2 mM À1 and detection limit of 0.024 mM (1.8 ppb) were obtained using linear sweep voltammetry.

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Section: Instrumentation and Proceduressupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Anodic Stripping Voltammetric Detection of Arsenic(III) at Gold Nanoparticle‐Modified Glassy Carbon Electrodes Prepared by Electrodeposition in the Presence of Various Additives

et al. 2008

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“…The processes during deposition (P1) and anodic stripping (P2) have been investigated for example at Au(111) surfaces [31] and they can be described as shown in Equations 1 and 2. The As(0) reduction product is formed only as a monolayer on the gold surface and both deposition and stripping processes have been reported to be electrochemically highly irreversible [31].…”

Section: Anodic Stripping Voltammetry Of Arsenite(iii) At Electroaggrmentioning

confidence: 99%

Arsenite Determination in Phosphate Media at Electroaggregated Gold Nanoparticle Deposits

Rassaei¹,

Sillanpää²,

French³

et al. 2008

Electroanalysis

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Compared to bulk gold, highly reactive mesoporous gold film deposits are prepared on a boron-doped diamond electrode surface. An electroaggregation process causing 5 nm diameter gold nanoparticles to deposit cathodically from aqueous solution is implemented to control the amount of mesoporous gold at the electrode surface. The resulting electrode surface is characterized by electron microscopy and by cyclic voltammetry. The reactivity of the electroaggregated gold deposit towards arsenite is investigated in nitric acid media and in neutral phosphate buffer media. Three processes consistent with (i) cathodic deposition of arsenic metal (As(III) ! As(0)), (ii) anodic stripping (As(0) ! As(III)), and oxidation of arsenite (As(III) ! As(V)) are observed and shown to shift in potential with approximately 58 mV per pH unit (Nernstian at 20 8C). Improved anodic stripping voltammetry responses for solutions of arsenite(III) in 0.1 M HNO 3 and in 0.1 M phosphate buffer solution are observed as the gold nanoparticle deposition time is increased. Typical detection limits of LOD(3s) ¼ 30 ppb in nitric acid and LOD(3s) ¼ 1 ppb in phosphate buffer (pH 7) are observed.

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“…6a, 6b) than in HCl (6c and 6d). The difference between the anodic and cathodic peak heights in voltammograms recorded in HCl is caused by the fact that the system is not completely reversible [59]. This difference is more evident in H 2 SO 4 due to the different potential ranges: for both solutions (Fig.…”

Section: Study Of As(iii) Electrochemical Behaviourmentioning

confidence: 95%

Determination of As(III) by anodic stripping voltammetry using a lateral gold electrode: Experimental conditions, electron transfer and monitoring of electrode surface

Giacomino

Abollino

Lazzara

et al. 2011

Talanta

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The electrochemical reaction mechanism of arsenic deposition on an Au(111) electrode

Cited by 51 publications

References 45 publications

Anodic Stripping Voltammetric Detection of Arsenic(III) at Gold Nanoparticle‐Modified Glassy Carbon Electrodes Prepared by Electrodeposition in the Presence of Various Additives

Anodic Stripping Voltammetric Detection of Arsenic(III) at Gold Nanoparticle‐Modified Glassy Carbon Electrodes Prepared by Electrodeposition in the Presence of Various Additives

Arsenite Determination in Phosphate Media at Electroaggregated Gold Nanoparticle Deposits

Determination of As(III) by anodic stripping voltammetry using a lateral gold electrode: Experimental conditions, electron transfer and monitoring of electrode surface

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