Voltammetric detection of arsenic on a bismuth modified exfoliated graphite electrode

Thabile Ndlovu; Bhekie B. Mamba; Srinivasan Sampath; Rui W. Krause; Omotayo A. Arotiba

doi:10.1016/j.electacta.2013.08.084

Voltammetric detection of arsenic on a bismuth modified exfoliated graphite electrode

Thabile Ndlovu, Bhekie B. Mamba, Srinivasan Sampath, Rui W. Krause, Omotayo A. Arotiba

Chemical Sciences

Research output: Contribution to journal › Article › peer-review

78 Citations (Scopus)

Abstract

We present the application of a bismuth modified exfoliated graphite electrode in the detection of arsenic in water. Bismuth film was electrodeposited onto an exfoliated graphite (EG) electrode at a potential of -600 mV. The modification of EG resulted in an increase in the electroactive surface area of the electrode and consequently peak current enhancement in Ru(NH₃)₆^2+/3+ redox probe. Square wave anodic stripping voltammetry was performed with the modified electrode (EG-Bi) in As (III) solutions at the optimum conditions of pH 6, deposition potential of -600 mV and pre-concentration time of 180 s. The EG-Bi was able to detect As (III) to the limit of 5 μg L^-1and was not susceptible to many interfering cations except Cu (II). The EG-Bi is low cost and easy to prepare.

Original language	English
Pages (from-to)	48-53
Number of pages	6
Journal	Electrochimica Acta
Volume	128
DOIs	https://doi.org/10.1016/j.electacta.2013.08.084
Publication status	Published - 10 May 2014

Keywords

Arsenic
Bismuth
Electrochemical sensor
Square wave anodic stripping voltammetry
Water

ASJC Scopus subject areas

General Chemical Engineering
Electrochemistry

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10.1016/j.electacta.2013.08.084

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title = "Voltammetric detection of arsenic on a bismuth modified exfoliated graphite electrode",

abstract = "We present the application of a bismuth modified exfoliated graphite electrode in the detection of arsenic in water. Bismuth film was electrodeposited onto an exfoliated graphite (EG) electrode at a potential of -600 mV. The modification of EG resulted in an increase in the electroactive surface area of the electrode and consequently peak current enhancement in Ru(NH3)62+/3+ redox probe. Square wave anodic stripping voltammetry was performed with the modified electrode (EG-Bi) in As (III) solutions at the optimum conditions of pH 6, deposition potential of -600 mV and pre-concentration time of 180 s. The EG-Bi was able to detect As (III) to the limit of 5 μg L-1and was not susceptible to many interfering cations except Cu (II). The EG-Bi is low cost and easy to prepare.",

keywords = "Arsenic, Bismuth, Electrochemical sensor, Square wave anodic stripping voltammetry, Water",

author = "Thabile Ndlovu and Mamba, {Bhekie B.} and Srinivasan Sampath and Krause, {Rui W.} and Arotiba, {Omotayo A.}",

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T1 - Voltammetric detection of arsenic on a bismuth modified exfoliated graphite electrode

AU - Ndlovu, Thabile

AU - Mamba, Bhekie B.

AU - Sampath, Srinivasan

AU - Krause, Rui W.

AU - Arotiba, Omotayo A.

PY - 2014/5/10

Y1 - 2014/5/10

N2 - We present the application of a bismuth modified exfoliated graphite electrode in the detection of arsenic in water. Bismuth film was electrodeposited onto an exfoliated graphite (EG) electrode at a potential of -600 mV. The modification of EG resulted in an increase in the electroactive surface area of the electrode and consequently peak current enhancement in Ru(NH3)62+/3+ redox probe. Square wave anodic stripping voltammetry was performed with the modified electrode (EG-Bi) in As (III) solutions at the optimum conditions of pH 6, deposition potential of -600 mV and pre-concentration time of 180 s. The EG-Bi was able to detect As (III) to the limit of 5 μg L-1and was not susceptible to many interfering cations except Cu (II). The EG-Bi is low cost and easy to prepare.

AB - We present the application of a bismuth modified exfoliated graphite electrode in the detection of arsenic in water. Bismuth film was electrodeposited onto an exfoliated graphite (EG) electrode at a potential of -600 mV. The modification of EG resulted in an increase in the electroactive surface area of the electrode and consequently peak current enhancement in Ru(NH3)62+/3+ redox probe. Square wave anodic stripping voltammetry was performed with the modified electrode (EG-Bi) in As (III) solutions at the optimum conditions of pH 6, deposition potential of -600 mV and pre-concentration time of 180 s. The EG-Bi was able to detect As (III) to the limit of 5 μg L-1and was not susceptible to many interfering cations except Cu (II). The EG-Bi is low cost and easy to prepare.

KW - Arsenic

KW - Bismuth

KW - Electrochemical sensor

KW - Square wave anodic stripping voltammetry

KW - Water

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U2 - 10.1016/j.electacta.2013.08.084

DO - 10.1016/j.electacta.2013.08.084

M3 - Article

AN - SCOPUS:84899456139

SN - 0013-4686

VL - 128

SP - 48

EP - 53

JO - Electrochimica Acta

JF - Electrochimica Acta

ER -

Voltammetric detection of arsenic on a bismuth modified exfoliated graphite electrode

Abstract

Keywords

ASJC Scopus subject areas

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