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Green Approach for Ultratrace Determination of Divalent Metal Ions and Arsenic Species Using Total-Reflection X-ray Fluorescence Spectrometry and Mercapto-Modified Graphene Oxide Nanosheets as a Novel Adsorbent

A new method based on dispersive microsolid phase extraction (DMSPE) and total-reflection X-ray fluorescence spectrometry (TXRF) is proposed for multielemental ultratrace determination of heavy metal ions and arsenic species. In the developed methodology, the crucial issue is a novel adsorbent synthesized by grafting 3-mercaptopropyl trirnethoxysilane on a graphene oxide (GO) surface. Mercapto-modified graphene oxide (GO-SH) can be applied in quantitative adsorption of cobalt, nickel, copper, cadmium, and lead ions. Moreover, GO-SH demonstrates selectivity toward arsenite in the presence of arsenate. Due to such features of GO-SH nanosheets as wrinkled structure and excellent dispersibility in water, GO-SH seems to be ideal for fast and simple preconcentration and determination of heavy metal ions using methodology based on DMSPE and TXRF measurement. The suspension of GO-SH was injected into an analyzed water sample; after filtration, the GO-SH nanosheets with adsorbed metal ions were redispersed in a small volume of internal standard solution and deposited onto a quartz reflector. The high enrichment factor of 150 allows obtaining detection limits of 0.11, 0.078, 0.079, 0.064, 0.054, and 0.083 ng mL(-1) for Co(II), Ni(II), Cu(II), As(III), Cd(II), and Pb(II), respectively. Such low detection limits can be obtained using a benchtop TXRF system without cooling media and gas consumption. The method is suitable for the analysis of water, including high salinity samples difficult to analyze using other spectroscopy techniques. Moreover, GO-SH can be applied to the arsenic speciation due to its selectivity toward arsenite

The project was supported by the National Science Center (Poland) by Grant No. DEC-2012/07/B/ST4/00568 and also by the Spanish National Research Programmes (Project Ref CGL2010-22168-C03-01 and Project Ref CGL2013-48802-C3-2-R)

© Analytical Chemistry, 2015, vol. 87, núm. 6, p. 3535-3542

American Chemical Society (ACS)

Author: Sitko, Rafal
Janik, Paulina
Zawisza, Beata
Talik, Ewa
Marguí Grabulosa, Eva
Queralt i Mitjans, Ignasi
Date: 2015 March 17
Abstract: A new method based on dispersive microsolid phase extraction (DMSPE) and total-reflection X-ray fluorescence spectrometry (TXRF) is proposed for multielemental ultratrace determination of heavy metal ions and arsenic species. In the developed methodology, the crucial issue is a novel adsorbent synthesized by grafting 3-mercaptopropyl trirnethoxysilane on a graphene oxide (GO) surface. Mercapto-modified graphene oxide (GO-SH) can be applied in quantitative adsorption of cobalt, nickel, copper, cadmium, and lead ions. Moreover, GO-SH demonstrates selectivity toward arsenite in the presence of arsenate. Due to such features of GO-SH nanosheets as wrinkled structure and excellent dispersibility in water, GO-SH seems to be ideal for fast and simple preconcentration and determination of heavy metal ions using methodology based on DMSPE and TXRF measurement. The suspension of GO-SH was injected into an analyzed water sample; after filtration, the GO-SH nanosheets with adsorbed metal ions were redispersed in a small volume of internal standard solution and deposited onto a quartz reflector. The high enrichment factor of 150 allows obtaining detection limits of 0.11, 0.078, 0.079, 0.064, 0.054, and 0.083 ng mL(-1) for Co(II), Ni(II), Cu(II), As(III), Cd(II), and Pb(II), respectively. Such low detection limits can be obtained using a benchtop TXRF system without cooling media and gas consumption. The method is suitable for the analysis of water, including high salinity samples difficult to analyze using other spectroscopy techniques. Moreover, GO-SH can be applied to the arsenic speciation due to its selectivity toward arsenite
The project was supported by the National Science Center (Poland) by Grant No. DEC-2012/07/B/ST4/00568 and also by the Spanish National Research Programmes (Project Ref CGL2010-22168-C03-01 and Project Ref CGL2013-48802-C3-2-R)
Format: application/pdf
ISSN: 0003-2700 (versió paper)
1520-6882 (versió electrònica)
Other identifiers: http://dx.doi/org/10.1021/acs.analchem.5b00283
Document access: http://hdl.handle.net/10256/10948
Language: eng
Publisher: American Chemical Society (ACS)
Collection: MINECO/PE 2013-2016/CGL2013-48802-C3-2-R
MICYT/PN 2010-2014/CGL2010-22168-C03-01
Reproducció digital del document publicat a: http:dx.doi/org/10.1021/acs.analchem.5b00283
Articles publicats (D-Q)
Is part of: © Analytical Chemistry, 2015, vol. 87, núm. 6, p. 3535-3542
Rights: Tots els drets reservats
Subject: Espectroscòpia de raigs X
X-ray spectroscopy
Espectroscòpia de fluorescència
Photoelectron spectroscopy
Espectroscòpia d’absorció atòmica
Atomic absortion spectroscopy
Aigua -- Anàlisi
Water -- Analysis
Title: Green Approach for Ultratrace Determination of Divalent Metal Ions and Arsenic Species Using Total-Reflection X-ray Fluorescence Spectrometry and Mercapto-Modified Graphene Oxide Nanosheets as a Novel Adsorbent
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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