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Abstract:

A flow injection system based on a modified polytetrafluoroethylene (PTFE) knotted reactor (KR) was developed for arsenite [As(III)] and arsenate [As(V)] species preconcentration and determination by electrothermal atomic absorption spectrometry (ETAAS). Activated carbon (AC) was immobilized on the inner walls of a PTFE KR by a thermal treatment. A significant increase in analyte retention was obtained with the AC-modified KR (100%) as compared to the regular PTFE KR (25%). The preconcentration method involved the on-line formation of As(III)-ammonium pyrrolidinedithiocarbamate (As-APDC) complex, followed by its adsorption onto the inner walls of the AC-modified KR. After analyte retention, the complex was eluted with acetone directly into the graphite furnace of ETAAS. The parameters affecting the flow injection system were evaluated with a full central composite face centered design with three center points. Under optimum conditions, a preconcentration factor of 200 was obtained with 10 ml of sample. The detection limit was 4 ng L- 1 and the relative standard deviation (RSD) for six replicate measurements at 0.2 μg L- 1 of As were 4.3% and 4.7% for As(III) and As(V), respectively. The developed methodology was highly selective towards As(III), while As(V), monomethylarsonic acid [MMA(V)] and dimethylarsinic [DMA(V)] were not retained in the AC-modified KR. The proposed method was successfully applied for As speciation analysis in infusions originated from medicinal herbs and tea. © 2014 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Activated carbon-modified knotted reactor coupled to electrothermal atomic absorption spectrometry for sensitive determination of arsenic species in medicinal herbs and tea infusions
Autor:Grijalba, A.C.; Martinis, E.M.; Lascalea, G.E.; Wuilloud, R.G.
Filiación:Laboratory of Analytical Chemistry for Research and Development (QUIANID), Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Padre J. Contreras 1300, Mendoza, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
Palabras clave:Arsenic speciation; ETAAS; Knotted reactor; Medicinal herb; Tea; Absorption spectroscopy; Acetone; Activated carbon; Arsenic; Atomic absorption spectrometry; Arsenic speciation; ETAAS; Knotted reactors; Medicinal herb; Tea; Coupled circuits
Año:2015
Volumen:103-104
Página de inicio:49
Página de fin:56
DOI: http://dx.doi.org/10.1016/j.sab.2014.11.007
Título revista:Spectrochimica Acta - Part B Atomic Spectroscopy
Título revista abreviado:Spectrochim. Acta Part B At. Spectrosc.
ISSN:05848547
CODEN:SAASB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05848547_v103-104_n_p49_Grijalba

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Citas:

---------- APA ----------
Grijalba, A.C., Martinis, E.M., Lascalea, G.E. & Wuilloud, R.G. (2015) . Activated carbon-modified knotted reactor coupled to electrothermal atomic absorption spectrometry for sensitive determination of arsenic species in medicinal herbs and tea infusions. Spectrochimica Acta - Part B Atomic Spectroscopy, 103-104, 49-56.
http://dx.doi.org/10.1016/j.sab.2014.11.007
---------- CHICAGO ----------
Grijalba, A.C., Martinis, E.M., Lascalea, G.E., Wuilloud, R.G. "Activated carbon-modified knotted reactor coupled to electrothermal atomic absorption spectrometry for sensitive determination of arsenic species in medicinal herbs and tea infusions" . Spectrochimica Acta - Part B Atomic Spectroscopy 103-104 (2015) : 49-56.
http://dx.doi.org/10.1016/j.sab.2014.11.007
---------- MLA ----------
Grijalba, A.C., Martinis, E.M., Lascalea, G.E., Wuilloud, R.G. "Activated carbon-modified knotted reactor coupled to electrothermal atomic absorption spectrometry for sensitive determination of arsenic species in medicinal herbs and tea infusions" . Spectrochimica Acta - Part B Atomic Spectroscopy, vol. 103-104, 2015, pp. 49-56.
http://dx.doi.org/10.1016/j.sab.2014.11.007
---------- VANCOUVER ----------
Grijalba, A.C., Martinis, E.M., Lascalea, G.E., Wuilloud, R.G. Activated carbon-modified knotted reactor coupled to electrothermal atomic absorption spectrometry for sensitive determination of arsenic species in medicinal herbs and tea infusions. Spectrochim. Acta Part B At. Spectrosc. 2015;103-104:49-56.
http://dx.doi.org/10.1016/j.sab.2014.11.007