Determination of metal impurities in carbon nanotubes by direct solid sampling electrothermal atomic absorption spectrometry

Journal of the Brazilian Chemical Society

Paola A. Mello¹  Luiz Frederico Rodrigues¹  Matheus A. G. Nunes¹  Julio Cezar P. Mattos¹  Edson I. Müller¹  Valderi L. Dressler¹  Erico M. M. Flores¹ 

[1] ,Universidade Federal de Santa Maria Departamento de Química Santa Maria RS ,Brazil

关键词: carbon nanotubes;    metal impurities;    solid sampling;    electrothermal atomic absorption spectrometry;   

DOI  :  10.1590/S0103-50532011000600006

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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