Publication: Non-chromatographic speciation of arsenic by successive dispersive liquidliquid microextraction and in situ formation of an ionic liquid in water samples
Authors
Vicente Martínez, Yésica
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Publisher
Elsevier
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DOI
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info:eu-repo/semantics/article
Description
https://doi.org/10.1016/j.microc.2020.105102
© 2020 Elsevier Ltd. This document is the published version of a published work that appeared in final form in Microchemical Journal To access the final edited and published work see: https://doi.org/10.1016/j.microc.2020.105102
© 2020 Elsevier Ltd. This document is the published version of a published work that appeared in final form in Microchemical Journal To access the final edited and published work see: https://doi.org/10.1016/j.microc.2020.105102
Abstract
Arsenic is an element present in waters in its different species which can cause a serious risk to human health due
to the consumption of these waters. However, the toxicity of each species is very different. Because of that, in
analytical chemistry there is a great interest in developing methods that allow the quantification of low concentrations
and speciation of arsenic. Accordingly, this work introduces a novel method applied to determine
very low concentrations of arsenic species (As (III), As (V), monomethylarsonic acid (MA), dimethylarsinic acid
(DMA) and arsenobetaine (AB)) in water samples. The procedure provides high enrichment factors and great
sensitivity in a simple and non-chromatographic way using electrothermal atomic absorption spectrometry. The
in-situ formation of an ionic liquid (IL) results in a dispersion through the formation of a cloud of IL droplets that
allows the instantaneous extraction of the arsenic species. After centrifugation, they can be quantified by direct
injection of the extract (IL+arsenic species) into the detector. The different experimental conditions such as pH
and the use of complexing agents allow the selective extraction of each species. An enrichment factor of 295 is
obtained by using this procedure. Additionally, high sensitivity and a low detection limit (0.02 μg L−1) for all
species are achieved, enabling the method as an alternative for the chromatographic techniques.
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Citation
Microchemical Journal, 157, 105102 (2020)
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