A field deployable method for a rapid screening analysis of inorganic arsenic in seaweed

Edi Bralatei; Karolina  Nekrosiute; Jenny  Ronan; Andrea Raab; Evin  McGovern; Dagmar B. Stengel; Eva M. Krupp; Joerg Feldmann

doi:10.1007/s00604-017-2151-1

A field deployable method for a rapid screening analysis of inorganic arsenic in seaweed

Edi Bralatei, Karolina Nekrosiute, Jenny Ronan, Andrea Raab, Evin McGovern, Dagmar B. Stengel, Eva M. Krupp, Joerg Feldmann

Chemistry

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

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Abstract

Inorganic arsenic (iAs) in 13 store-bought edible seaweed samples and 34 dried kelp (Laminaria digitata) samples was determined by a newly developed, field-deployable method (FDM) with the aid of a field test kit for arsenic in water. Results from the FDM were compared to results from speciation analysis achieved by using high performance liquid chromatography coupled to inductively coupled plasma mass spectrometry (HPLC-ICP-MS). The FDM consisted of a simple extraction method using diluted HNO3 to quantitatively extract iAs without decomposing the organoarsenicals to iAs followed by the selective volatilisation of iAs as arsine (AsH3) and subsequent chemo-trapping on a filter paper soaked in mercury bromide (HgBr2) solution. Method optimization with a sub-set of samples showed 80–94% iAs recovery with the FDM with no matrix effect from organo-arsenic species in the form of dimethylarsinic acid (DMA) on the iAs concentration. The method displayed good reproducibility with an average error of ±19% and validation by HPLC-ICP-MS showed that the results from the FDM were comparable (slope = 1.03, R2 = 0.70) to those from speciation analysis with no bias. The FDM can be conducted within an hour and the observed limit of quantification was around 0.05 mg kg−1 (dry weight). This method is well suited for on-site monitoring of iAs in seaweed before it is harvested and can thus be recommended for use as a screening method for iAs in seaweed.

Original language	English
Pages (from-to)	1701–1709
Number of pages	9
Journal	Microchimica Acta
Volume	184
Issue number	6
Early online date	18 Mar 2017
DOIs	https://doi.org/10.1007/s00604-017-2151-1
Publication status	Published - Jun 2017

Bibliographical note

The authors thank the support for getting the seaweed samples from the projects funded under the Department of Agriculture, Food and the Marine’s Competitive research programmes in Ireland. Reference number 14 SF 860. The authors thank Corny Brombach for the graphical abstract.

Keywords

Gutzeit method
speciation
hyphenated method
HPLC-ICPMS
seaweed
laminaria
kelp

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A field deployable method for a rapid screening analysis of inorganic arsenic in seaweed
© The Author(s) 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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Cite this

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title = "A field deployable method for a rapid screening analysis of inorganic arsenic in seaweed",

abstract = "Inorganic arsenic (iAs) in 13 store-bought edible seaweed samples and 34 dried kelp (Laminaria digitata) samples was determined by a newly developed, field-deployable method (FDM) with the aid of a field test kit for arsenic in water. Results from the FDM were compared to results from speciation analysis achieved by using high performance liquid chromatography coupled to inductively coupled plasma mass spectrometry (HPLC-ICP-MS). The FDM consisted of a simple extraction method using diluted HNO3 to quantitatively extract iAs without decomposing the organoarsenicals to iAs followed by the selective volatilisation of iAs as arsine (AsH3) and subsequent chemo-trapping on a filter paper soaked in mercury bromide (HgBr2) solution. Method optimization with a sub-set of samples showed 80–94% iAs recovery with the FDM with no matrix effect from organo-arsenic species in the form of dimethylarsinic acid (DMA) on the iAs concentration. The method displayed good reproducibility with an average error of ±19% and validation by HPLC-ICP-MS showed that the results from the FDM were comparable (slope = 1.03, R2 = 0.70) to those from speciation analysis with no bias. The FDM can be conducted within an hour and the observed limit of quantification was around 0.05 mg kg−1 (dry weight). This method is well suited for on-site monitoring of iAs in seaweed before it is harvested and can thus be recommended for use as a screening method for iAs in seaweed.",

keywords = "Gutzeit method, speciation, hyphenated method, HPLC-ICPMS, seaweed, laminaria, kelp",

author = "Edi Bralatei and Karolina Nekrosiute and Jenny Ronan and Andrea Raab and Evin McGovern and Stengel, {Dagmar B.} and Krupp, {Eva M.} and Joerg Feldmann",

note = "The authors thank the support for getting the seaweed samples from the projects funded under the Department of Agriculture, Food and the Marine{\textquoteright}s Competitive research programmes in Ireland. Reference number 14 SF 860. The authors thank Corny Brombach for the graphical abstract.",

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doi = "10.1007/s00604-017-2151-1",

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AU - Bralatei, Edi

AU - Nekrosiute, Karolina

AU - Ronan, Jenny

AU - Raab, Andrea

AU - McGovern, Evin

AU - Stengel, Dagmar B.

AU - Krupp, Eva M.

AU - Feldmann, Joerg

N1 - The authors thank the support for getting the seaweed samples from the projects funded under the Department of Agriculture, Food and the Marine’s Competitive research programmes in Ireland. Reference number 14 SF 860. The authors thank Corny Brombach for the graphical abstract.

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Y1 - 2017/6

N2 - Inorganic arsenic (iAs) in 13 store-bought edible seaweed samples and 34 dried kelp (Laminaria digitata) samples was determined by a newly developed, field-deployable method (FDM) with the aid of a field test kit for arsenic in water. Results from the FDM were compared to results from speciation analysis achieved by using high performance liquid chromatography coupled to inductively coupled plasma mass spectrometry (HPLC-ICP-MS). The FDM consisted of a simple extraction method using diluted HNO3 to quantitatively extract iAs without decomposing the organoarsenicals to iAs followed by the selective volatilisation of iAs as arsine (AsH3) and subsequent chemo-trapping on a filter paper soaked in mercury bromide (HgBr2) solution. Method optimization with a sub-set of samples showed 80–94% iAs recovery with the FDM with no matrix effect from organo-arsenic species in the form of dimethylarsinic acid (DMA) on the iAs concentration. The method displayed good reproducibility with an average error of ±19% and validation by HPLC-ICP-MS showed that the results from the FDM were comparable (slope = 1.03, R2 = 0.70) to those from speciation analysis with no bias. The FDM can be conducted within an hour and the observed limit of quantification was around 0.05 mg kg−1 (dry weight). This method is well suited for on-site monitoring of iAs in seaweed before it is harvested and can thus be recommended for use as a screening method for iAs in seaweed.

AB - Inorganic arsenic (iAs) in 13 store-bought edible seaweed samples and 34 dried kelp (Laminaria digitata) samples was determined by a newly developed, field-deployable method (FDM) with the aid of a field test kit for arsenic in water. Results from the FDM were compared to results from speciation analysis achieved by using high performance liquid chromatography coupled to inductively coupled plasma mass spectrometry (HPLC-ICP-MS). The FDM consisted of a simple extraction method using diluted HNO3 to quantitatively extract iAs without decomposing the organoarsenicals to iAs followed by the selective volatilisation of iAs as arsine (AsH3) and subsequent chemo-trapping on a filter paper soaked in mercury bromide (HgBr2) solution. Method optimization with a sub-set of samples showed 80–94% iAs recovery with the FDM with no matrix effect from organo-arsenic species in the form of dimethylarsinic acid (DMA) on the iAs concentration. The method displayed good reproducibility with an average error of ±19% and validation by HPLC-ICP-MS showed that the results from the FDM were comparable (slope = 1.03, R2 = 0.70) to those from speciation analysis with no bias. The FDM can be conducted within an hour and the observed limit of quantification was around 0.05 mg kg−1 (dry weight). This method is well suited for on-site monitoring of iAs in seaweed before it is harvested and can thus be recommended for use as a screening method for iAs in seaweed.

KW - Gutzeit method

KW - speciation

KW - hyphenated method

KW - HPLC-ICPMS

KW - seaweed

KW - laminaria

KW - kelp

U2 - 10.1007/s00604-017-2151-1

DO - 10.1007/s00604-017-2151-1

M3 - Article

SN - 0026-3672

VL - 184

SP - 1701

EP - 1709

JO - Microchimica Acta

JF - Microchimica Acta

IS - 6

ER -

A field deployable method for a rapid screening analysis of inorganic arsenic in seaweed

Abstract

Bibliographical note

Keywords

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