Determination of metal impurities in carbon nanotubes by direct solid sampling electrothermal atomic absorption spectrometry
Metal impurities (Al, Cd, Co, Cr, Cu, Mg, Mn and Pb) were determined in carbon nanotubes (CNTs) by direct solid sampling electrothermal atomic absorption spectrometry (DSS-ET AAS, deuterium lamp background corrector). Parameters as pyrolysis and atomization temperatures, use of Pd as chemical modifier, feasibility of calibration using aqueous standard solutions and maximum sample mass were investigated. Results obtained by the proposed method were compared with those obtained by neutron activation analysis (NAA) and also by inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma optical emission spectrometry (ICP OES) after high-pressure microwave assisted wet digestion and microwave-induced combustion methods. No significant differences were observed between the results obtained by DSS-ET AAS, ICP-MS and ICP OES after both digestion methods and also by NAA. Calibration was performed using aqueous standards. Background signals were always lower than 0.02 (peak height) and no chemical modifier was used. The proposed method allowed the determination of all elements in CNTs with lower limits of detection in comparison with other techniques.
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Sociedade Brasileira de Química
2011
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oai:scielo:S0103-505320110006000062011-06-10Determination of metal impurities in carbon nanotubes by direct solid sampling electrothermal atomic absorption spectrometryMello,Paola A.Rodrigues,Luiz FredericoNunes,Matheus A. G.Mattos,Julio Cezar P.Müller,Edson I.Dressler,Valderi L.Flores,Erico M. M. carbon nanotubes metal impurities solid sampling electrothermal atomic absorption spectrometry Metal impurities (Al, Cd, Co, Cr, Cu, Mg, Mn and Pb) were determined in carbon nanotubes (CNTs) by direct solid sampling electrothermal atomic absorption spectrometry (DSS-ET AAS, deuterium lamp background corrector). Parameters as pyrolysis and atomization temperatures, use of Pd as chemical modifier, feasibility of calibration using aqueous standard solutions and maximum sample mass were investigated. Results obtained by the proposed method were compared with those obtained by neutron activation analysis (NAA) and also by inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma optical emission spectrometry (ICP OES) after high-pressure microwave assisted wet digestion and microwave-induced combustion methods. No significant differences were observed between the results obtained by DSS-ET AAS, ICP-MS and ICP OES after both digestion methods and also by NAA. Calibration was performed using aqueous standards. Background signals were always lower than 0.02 (peak height) and no chemical modifier was used. The proposed method allowed the determination of all elements in CNTs with lower limits of detection in comparison with other techniques.info:eu-repo/semantics/openAccessSociedade Brasileira de QuímicaJournal of the Brazilian Chemical Society v.22 n.6 20112011-06-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532011000600006en10.1590/S0103-50532011000600006 |
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Mello,Paola A. Rodrigues,Luiz Frederico Nunes,Matheus A. G. Mattos,Julio Cezar P. Müller,Edson I. Dressler,Valderi L. Flores,Erico M. M. |
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Mello,Paola A. Rodrigues,Luiz Frederico Nunes,Matheus A. G. Mattos,Julio Cezar P. Müller,Edson I. Dressler,Valderi L. Flores,Erico M. M. Determination of metal impurities in carbon nanotubes by direct solid sampling electrothermal atomic absorption spectrometry |
author_facet |
Mello,Paola A. Rodrigues,Luiz Frederico Nunes,Matheus A. G. Mattos,Julio Cezar P. Müller,Edson I. Dressler,Valderi L. Flores,Erico M. M. |
author_sort |
Mello,Paola A. |
title |
Determination of metal impurities in carbon nanotubes by direct solid sampling electrothermal atomic absorption spectrometry |
title_short |
Determination of metal impurities in carbon nanotubes by direct solid sampling electrothermal atomic absorption spectrometry |
title_full |
Determination of metal impurities in carbon nanotubes by direct solid sampling electrothermal atomic absorption spectrometry |
title_fullStr |
Determination of metal impurities in carbon nanotubes by direct solid sampling electrothermal atomic absorption spectrometry |
title_full_unstemmed |
Determination of metal impurities in carbon nanotubes by direct solid sampling electrothermal atomic absorption spectrometry |
title_sort |
determination of metal impurities in carbon nanotubes by direct solid sampling electrothermal atomic absorption spectrometry |
description |
Metal impurities (Al, Cd, Co, Cr, Cu, Mg, Mn and Pb) were determined in carbon nanotubes (CNTs) by direct solid sampling electrothermal atomic absorption spectrometry (DSS-ET AAS, deuterium lamp background corrector). Parameters as pyrolysis and atomization temperatures, use of Pd as chemical modifier, feasibility of calibration using aqueous standard solutions and maximum sample mass were investigated. Results obtained by the proposed method were compared with those obtained by neutron activation analysis (NAA) and also by inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma optical emission spectrometry (ICP OES) after high-pressure microwave assisted wet digestion and microwave-induced combustion methods. No significant differences were observed between the results obtained by DSS-ET AAS, ICP-MS and ICP OES after both digestion methods and also by NAA. Calibration was performed using aqueous standards. Background signals were always lower than 0.02 (peak height) and no chemical modifier was used. The proposed method allowed the determination of all elements in CNTs with lower limits of detection in comparison with other techniques. |
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Sociedade Brasileira de Química |
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2011 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532011000600006 |
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