Gold microelectrode ensembles: Cheap, reusable and stable electrodes for the determination of arsenic (V) under aerobic conditions

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Gold microelectrode ensembles : Cheap, reusable and stable electrodes for the determination of arsenic (V) under aerobic conditions. / Zakharova, Elza A.; Noskova, Galina N.; Kabakaev, Alex S.; Rees, Neil; Compton, Richard G.

In: International Journal of Environmental Analytical Chemistry, Vol. 93, No. 11, 16.12.2013, p. 1105-1115.

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@article{87f00c3f9d3b4b8ea9b8bb9562a4d427,
title = "Gold microelectrode ensembles: Cheap, reusable and stable electrodes for the determination of arsenic (V) under aerobic conditions",
abstract = "The determination of total arsenic through As(V) anodic stripping voltammetry (ASV) is, in some cases, preferable over As(III) ASV. The As(V) ASV procedure has no chemical reduction step from As(V) into As(III), which results in decreased analysis time and no contamination from reducting reagents. A simple and reliable procedure of As(V) determination is proposed. Anodic stripping determination of trace As(V) at gold microelectrode ensembles in diluted HCl solution in the presence of dissolved oxygen is shown. The electrode is based on a carbon black (30%)-polyethylene composite. The sensor was prepared by gold electrodeposition on the surface of the composite electrode. The given sensor is cheap, reliable and stable, especially when electrochemical activation is employed. The experimental parameters for the electrochemical determination were optimized, namely 0.005M HCl as the background electrolyte, the deposition potential -2.2V (versus Ag/AgCl in 1M KCl) and 180mVs-1 linear scan rate. Calibration curves were obtained and were linear in [As(V)] over the 1.5-45 μgL-1 range, with a LOD of 0.5 μgL-1. The effect of common interfering species is studied. The electrochemical behaviour of As(III) form is studied in the same experimental conditions. It was found that As(III) is deposited at lower potentials (starting at -0.6 V) and the sensitivity of As(III) detection is higher, but dependant on the presence of dissolved oxygen. The speciation of inorganic forms of arsenic is discussed.",
keywords = "Aerated medium, Arsenic, As(III), As(V), Dissolved oxygen, Gold, Microelectrode, Random array of microelectrodes, Speciation, Stripping voltammetry, Total inorganic arsenic",
author = "Zakharova, {Elza A.} and Noskova, {Galina N.} and Kabakaev, {Alex S.} and Neil Rees and Compton, {Richard G.}",
year = "2013",
month = dec,
day = "16",
doi = "10.1080/03067319.2012.690151",
language = "English",
volume = "93",
pages = "1105--1115",
journal = "International Journal of Environmental Analytical Chemistry",
issn = "0306-7319",
publisher = "Taylor & Francis",
number = "11",

}

RIS

TY - JOUR

T1 - Gold microelectrode ensembles

T2 - Cheap, reusable and stable electrodes for the determination of arsenic (V) under aerobic conditions

AU - Zakharova, Elza A.

AU - Noskova, Galina N.

AU - Kabakaev, Alex S.

AU - Rees, Neil

AU - Compton, Richard G.

PY - 2013/12/16

Y1 - 2013/12/16

N2 - The determination of total arsenic through As(V) anodic stripping voltammetry (ASV) is, in some cases, preferable over As(III) ASV. The As(V) ASV procedure has no chemical reduction step from As(V) into As(III), which results in decreased analysis time and no contamination from reducting reagents. A simple and reliable procedure of As(V) determination is proposed. Anodic stripping determination of trace As(V) at gold microelectrode ensembles in diluted HCl solution in the presence of dissolved oxygen is shown. The electrode is based on a carbon black (30%)-polyethylene composite. The sensor was prepared by gold electrodeposition on the surface of the composite electrode. The given sensor is cheap, reliable and stable, especially when electrochemical activation is employed. The experimental parameters for the electrochemical determination were optimized, namely 0.005M HCl as the background electrolyte, the deposition potential -2.2V (versus Ag/AgCl in 1M KCl) and 180mVs-1 linear scan rate. Calibration curves were obtained and were linear in [As(V)] over the 1.5-45 μgL-1 range, with a LOD of 0.5 μgL-1. The effect of common interfering species is studied. The electrochemical behaviour of As(III) form is studied in the same experimental conditions. It was found that As(III) is deposited at lower potentials (starting at -0.6 V) and the sensitivity of As(III) detection is higher, but dependant on the presence of dissolved oxygen. The speciation of inorganic forms of arsenic is discussed.

AB - The determination of total arsenic through As(V) anodic stripping voltammetry (ASV) is, in some cases, preferable over As(III) ASV. The As(V) ASV procedure has no chemical reduction step from As(V) into As(III), which results in decreased analysis time and no contamination from reducting reagents. A simple and reliable procedure of As(V) determination is proposed. Anodic stripping determination of trace As(V) at gold microelectrode ensembles in diluted HCl solution in the presence of dissolved oxygen is shown. The electrode is based on a carbon black (30%)-polyethylene composite. The sensor was prepared by gold electrodeposition on the surface of the composite electrode. The given sensor is cheap, reliable and stable, especially when electrochemical activation is employed. The experimental parameters for the electrochemical determination were optimized, namely 0.005M HCl as the background electrolyte, the deposition potential -2.2V (versus Ag/AgCl in 1M KCl) and 180mVs-1 linear scan rate. Calibration curves were obtained and were linear in [As(V)] over the 1.5-45 μgL-1 range, with a LOD of 0.5 μgL-1. The effect of common interfering species is studied. The electrochemical behaviour of As(III) form is studied in the same experimental conditions. It was found that As(III) is deposited at lower potentials (starting at -0.6 V) and the sensitivity of As(III) detection is higher, but dependant on the presence of dissolved oxygen. The speciation of inorganic forms of arsenic is discussed.

KW - Aerated medium

KW - Arsenic

KW - As(III)

KW - As(V)

KW - Dissolved oxygen

KW - Gold

KW - Microelectrode

KW - Random array of microelectrodes

KW - Speciation

KW - Stripping voltammetry

KW - Total inorganic arsenic

UR - http://www.scopus.com/inward/record.url?scp=84890062069&partnerID=8YFLogxK

U2 - 10.1080/03067319.2012.690151

DO - 10.1080/03067319.2012.690151

M3 - Article

AN - SCOPUS:84890062069

VL - 93

SP - 1105

EP - 1115

JO - International Journal of Environmental Analytical Chemistry

JF - International Journal of Environmental Analytical Chemistry

SN - 0306-7319

IS - 11

ER -