Activated carbon-modified knotted reactor coupled to electrothermal atomic absorption spectrometry for sensitive determination of arsenic species in medicinal herbs and tea infusions

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...

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Detalles Bibliográficos
Publicado: 2015
Materias:
Arsenic speciation
ETAAS
Knotted reactor
Medicinal herb
Tea
Absorption spectroscopy
Acetone
Activated carbon
Arsenic
Atomic absorption spectrometry
Knotted reactors
Coupled circuits
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05848547_v103-104_n_p49_Grijalba
http://hdl.handle.net/20.500.12110/paper_05848547_v103-104_n_p49_Grijalba
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_05848547_v103-104_n_p49_Grijalba
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spelling paper:paper_05848547_v103-104_n_p49_Grijalba2023-06-08T15:42:45Z Activated carbon-modified knotted reactor coupled to electrothermal atomic absorption spectrometry for sensitive determination of arsenic species in medicinal herbs and tea infusions 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 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. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05848547_v103-104_n_p49_Grijalba http://hdl.handle.net/20.500.12110/paper_05848547_v103-104_n_p49_Grijalba
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
Activated carbon-modified knotted reactor coupled to electrothermal atomic absorption spectrometry for sensitive determination of arsenic species in medicinal herbs and tea infusions
topic_facet 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
description 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.
title Activated carbon-modified knotted reactor coupled to electrothermal atomic absorption spectrometry for sensitive determination of arsenic species in medicinal herbs and tea infusions
title_short Activated carbon-modified knotted reactor coupled to electrothermal atomic absorption spectrometry for sensitive determination of arsenic species in medicinal herbs and tea infusions
title_full Activated carbon-modified knotted reactor coupled to electrothermal atomic absorption spectrometry for sensitive determination of arsenic species in medicinal herbs and tea infusions
title_fullStr Activated carbon-modified knotted reactor coupled to electrothermal atomic absorption spectrometry for sensitive determination of arsenic species in medicinal herbs and tea infusions
title_full_unstemmed Activated carbon-modified knotted reactor coupled to electrothermal atomic absorption spectrometry for sensitive determination of arsenic species in medicinal herbs and tea infusions
title_sort activated carbon-modified knotted reactor coupled to electrothermal atomic absorption spectrometry for sensitive determination of arsenic species in medicinal herbs and tea infusions
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05848547_v103-104_n_p49_Grijalba
http://hdl.handle.net/20.500.12110/paper_05848547_v103-104_n_p49_Grijalba
_version_ 1768546588233302016

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