期刊
ANALYTICA CHIMICA ACTA
卷 873, 期 -, 页码 51-56出版社
ELSEVIER
DOI: 10.1016/j.aca.2015.02.063
关键词
Polycyclic aromatic hydrocarbons; Carbon nanotubes; Gas chromatography/mass spectrometry; Water analysis
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Fundo Nacional de Saude (FNS)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brazil (CAPES)
This paper describes a new, efficient and versatile method for the sampling and preconcentration of PAH in environmental water matrices using special hybrid magnetic carbon nanotubes. These N-doped amphiphilic CNT can be easily dispersed in any aqueous matrix due to the N containing hydrophilic part and at the same time show high efficiency for the adsorption of different PAH contaminants due to the very hydrophobic surface. After adsorption, the CNT can be easily removed from the medium by a simple magnetic separation. GC/MS analyses showed that the CNT method is more efficient than the use of polydimethylsiloxane (PDMS) with much lower solvent consumption, technical simplicity and time, showing good linearity (range 0.18-80.00 mu g L-1) and determination coefficient (R-2 > 0.9810). The limit of detection ranged from 0.05 to 0.42 mu g L-1 with limit of quantification from 0.18 to 1.40 mu g L-1. Recovery (n = 9) ranged from 80.50 +/- 10 to 105.40 +/- 12%. Intraday precision (RSD, n = 9) ranged from 1.91 to 9.01%, whereas inter day precision (RSD, n = 9) ranged from 7.02 to 17.94%. The method was applied to the analyses of PAH in four lake water samples collected in Belo Horizonte City, Brazil. (C) 2015 Elsevier B.V. All rights reserved.
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