Voltammetric detection of arsenic on a bismuth modified exfoliated graphite electrode

被引：73

作者：

Ndlovu, Thabile ^{[1
]}

Mamba, Bhelde B. ^{[1
]}

Sampath, Srinivasan ^{[1
,2
]}

Krause, Rui W. ^{[1
]}

Arotiba, Omotayo A. ^{[1
]}

机构：

[1] Univ Johannesburg, Dept Appl Chem, ZA-2028 Johannesburg, South Africa

[2] Indian Inst Sci, Dept Inorgan & Phys Chem, Bangalore 560012, Karnataka, India

来源：

ELECTROCHIMICA ACTA | 2014年 / 128卷

基金：

新加坡国家研究基金会;

关键词：

Arsenic; Bismuth; Square wave anodic stripping voltammetry; Electrochemical sensor; Water; ANODIC-STRIPPING VOLTAMMETRY; CARBON COMPOSITE ELECTRODE; ELECTROCHEMICAL DETECTION; NATURAL-WATERS; LEAD; AS(III); SPECIATION; CADMIUM; SENSORS; REMOVAL;

D O I：

10.1016/j.electacta.2013.08.084

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

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+/13+) 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 180s. The EG-Bi was able to detect As (III) to the limit of 5 mu g L-1 and was not susceptible to many interfering cations except Cu (II). The EG-Bi is low cost and easy to prepare. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：48 / 53

页数：6

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