Electrochemical generation of arsenic volatile species using a gold/mercury amalgam cathode. Determination of arsenic by atomic absorption spectrometry

Andrea Caiminagua; Lenys Fernández; Hugo Romero; Byron Lapo; José Alvarado

doi:10.1016/j.ancr.2015.02.001

Electrochemical generation of arsenic volatile species using a gold/mercury amalgam cathode. Determination of arsenic by atomic absorption spectrometry

Andrea Caiminagua
, Lenys Fernández^*
, Hugo Romero
, Byron Lapo
, José Alvarado

^*Corresponding author for this work

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

11 Scopus citations

Abstract

The electrochemical generation of arsenic volatile species (arsine) using an Au/Hg amalgam cathode in a 0.5M H₂SO₄ solution, is described. Results were compared with those obtained with other cathodes commonly used for generation of arsine. The effects of the electrolytic conditions and interferent ions have been studied. Results show that the Au/Hg cathode has better tolerance to interference and higher repeatability than cathodes made out of platinum (Pt), gold (Au), reticulated glassy carbon (RGC), lead (Pb). Under optimized conditions, a 0.027μgL^-1 (3σ) detection limit for As(III) in aqueous solutions and a 2.4% relative standard deviation for a 0.1μgL^-1 As(III) were obtained. The accuracy of the method was verified by determination of As in a certified reference material. The proposed method was applied to the determination of As in spiked tap water samples.

Original language	English
Pages (from-to)	82-88
Number of pages	7
Journal	Analytical Chemistry Research
Volume	3
DOIs	https://doi.org/10.1016/j.ancr.2015.02.001
State	Published - 1 Mar 2015
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2015.

Funding

The authors would like to thank Proyecto Prometeo de la Secretaría de Educación Superior, Ciencia, Tecnología e Innovación de la República del Ecuador and Decanato de Investigación y Desarrollo de la Universidad Simón Bolívar (USB) , Caracas-Venezuela, for financial support. We also like to thank Planta Piloto de Farmacia de la Universidad Técnica de Machala, Laboratorio de Electroanálisis y Espectroscopia Atómica de la Universidad Simón Bolívar (USB) and Laboratorio de Investigación de la Universidad Técnica de Machala; for valuable technical assistance.

Funders
Caracas-Venezuela
Desarrollo de la Universidad Simón Bolívar
United Soybean Board
Secretaría de Educación Superior, Ciencia, Tecnología e Innovación

Keywords

Arsine
Atomic absorption spectrometry
Electrochemical arsenic hydride generation
Tap water samples

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10.1016/j.ancr.2015.02.001

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title = "Electrochemical generation of arsenic volatile species using a gold/mercury amalgam cathode. Determination of arsenic by atomic absorption spectrometry",

abstract = "The electrochemical generation of arsenic volatile species (arsine) using an Au/Hg amalgam cathode in a 0.5M H2SO4 solution, is described. Results were compared with those obtained with other cathodes commonly used for generation of arsine. The effects of the electrolytic conditions and interferent ions have been studied. Results show that the Au/Hg cathode has better tolerance to interference and higher repeatability than cathodes made out of platinum (Pt), gold (Au), reticulated glassy carbon (RGC), lead (Pb). Under optimized conditions, a 0.027μgL-1 (3σ) detection limit for As(III) in aqueous solutions and a 2.4\% relative standard deviation for a 0.1μgL-1 As(III) were obtained. The accuracy of the method was verified by determination of As in a certified reference material. The proposed method was applied to the determination of As in spiked tap water samples.",

keywords = "Arsine, Atomic absorption spectrometry, Electrochemical arsenic hydride generation, Tap water samples",

author = "Andrea Caiminagua and Lenys Fern{\'a}ndez and Hugo Romero and Byron Lapo and Jos{\'e} Alvarado",

note = "Publisher Copyright: {\textcopyright} 2015.",

year = "2015",

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doi = "10.1016/j.ancr.2015.02.001",

language = "English",

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T1 - Electrochemical generation of arsenic volatile species using a gold/mercury amalgam cathode. Determination of arsenic by atomic absorption spectrometry

AU - Caiminagua, Andrea

AU - Fernández, Lenys

AU - Romero, Hugo

AU - Lapo, Byron

AU - Alvarado, José

PY - 2015/3/1

Y1 - 2015/3/1

N2 - The electrochemical generation of arsenic volatile species (arsine) using an Au/Hg amalgam cathode in a 0.5M H2SO4 solution, is described. Results were compared with those obtained with other cathodes commonly used for generation of arsine. The effects of the electrolytic conditions and interferent ions have been studied. Results show that the Au/Hg cathode has better tolerance to interference and higher repeatability than cathodes made out of platinum (Pt), gold (Au), reticulated glassy carbon (RGC), lead (Pb). Under optimized conditions, a 0.027μgL-1 (3σ) detection limit for As(III) in aqueous solutions and a 2.4% relative standard deviation for a 0.1μgL-1 As(III) were obtained. The accuracy of the method was verified by determination of As in a certified reference material. The proposed method was applied to the determination of As in spiked tap water samples.

AB - The electrochemical generation of arsenic volatile species (arsine) using an Au/Hg amalgam cathode in a 0.5M H2SO4 solution, is described. Results were compared with those obtained with other cathodes commonly used for generation of arsine. The effects of the electrolytic conditions and interferent ions have been studied. Results show that the Au/Hg cathode has better tolerance to interference and higher repeatability than cathodes made out of platinum (Pt), gold (Au), reticulated glassy carbon (RGC), lead (Pb). Under optimized conditions, a 0.027μgL-1 (3σ) detection limit for As(III) in aqueous solutions and a 2.4% relative standard deviation for a 0.1μgL-1 As(III) were obtained. The accuracy of the method was verified by determination of As in a certified reference material. The proposed method was applied to the determination of As in spiked tap water samples.

KW - Arsine

KW - Atomic absorption spectrometry

KW - Electrochemical arsenic hydride generation

KW - Tap water samples

UR - https://www.scopus.com/pages/publications/84923917419

U2 - 10.1016/j.ancr.2015.02.001

DO - 10.1016/j.ancr.2015.02.001

M3 - Article

AN - SCOPUS:84923917419

SN - 2214-1812

VL - 3

SP - 82

EP - 88

JO - Analytical Chemistry Research

JF - Analytical Chemistry Research

ER -

Electrochemical generation of arsenic volatile species using a gold/mercury amalgam cathode. Determination of arsenic by atomic absorption spectrometry

Abstract

Bibliographical note

Funding

Keywords

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