Non-chromatographic methods focused on
speciation of arsenic and selenium in food and
environmental samples

• Authors: Helen C. Rezende , Ione L. S. Almeida , Luciana M. Coelho , Nívia M. M. Coelho , Thiago L. Marques
• Languages of publication: EN

Abstracts

EN

Speciation is a promising and essential tool in
the evaluation of the contamination of metals in food and
environmental samples. In this context, information about
the species of these elements is important considering that
toxic effects are directly related to their chemical forms. The
enormous progress in combining separation and detection
techniques has enabled the effective chemical speciation.
However, a possible source of error in studies of speciation
occurs during sample preparation. Appropriate treatment
of samples is necessary in order to ensure that interconversion
between the species does not occur during
the experimental procedure prior to the final analysis.
In this review, methods of sample preparation for the
determination of arsenic and selenium in food and
environmental samples are discussed. We decided to focus
on these elements since they account for around 50% of
all speciation studies. Procedures including conventional
extraction, microwave-assisted extraction and sonolysis
are discussed as simple ways to ensure species selectivity.
The main purpose of this review is to provide an update on
the recent literature concerning the strategies for arsenic
and selenium speciation and to critically discuss their
advantages and weaknesses compared with the commonly
accepted approach of combining non-chromatographic
and spectroscopic techniques. The problems focused on
involve sampling, sample preparation and storage, as well
as changes in ‘species information’ that occur during the
use of various separation technologies. These difficulties are described along with recent developments aimed at
overcoming these potential issues.

Keywords

EN

Speciation, food; environmental; arsenic; selenium

• Publisher: De Gruyter Open
• Journal: Sample Preparation
• Year: 2014
• Volume: 2
• Issue: 1

Dates

online

14 - 1 - 2015

received

25 - 2 - 2014

accepted

3 - 10 - 2014

Contributors

author

Helen C. Rezende

• Institute of Chemistry,
  Federal University of Uberlândia, Av. João Naves de Ávila 2121, CEP
  38400-902, Uberlândia, MG, Brazil

author

Ione L. S. Almeida

• Institute of Chemistry,
  Federal University of Uberlândia, Av. João Naves de Ávila 2121, CEP
  38400-902, Uberlândia, MG, Brazil

author

Luciana M. Coelho

• Department of Chemistry, Federal University of Goiás,
  Av. Dr. Lamartine Pinto de Avelar, 1120, CEP 75704-020, Catalão,
  GO, Brazil

author

Nívia M. M. Coelho

• Institute of Chemistry,
  Federal University of Uberlândia, Av. João Naves de Ávila 2121, CEP
  38400-902, Uberlândia, MG, Brazil

author

Thiago L. Marques

• Institute of Chemistry,
  Federal University of Uberlândia, Av. João Naves de Ávila 2121, CEP
  38400-902, Uberlândia, MG, Brazil

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Identifiers

DOI

10.2478/sampre-2014-0004