Magnetic N-doped carbon nanotubes: A versatile and efficient material for the determination of polycyclic aromatic hydrocarbons in environmental water samples.

Autor: Menezes HC; Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Avenida Antônio Carlos 6627, 31270901 Belo Horizonte/MG, Brazil., de Barcelos SM; Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Avenida Antônio Carlos 6627, 31270901 Belo Horizonte/MG, Brazil., Macedo DF; Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Avenida Antônio Carlos 6627, 31270901 Belo Horizonte/MG, Brazil., Purceno AD; Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Avenida Antônio Carlos 6627, 31270901 Belo Horizonte/MG, Brazil., Machado BF; Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Avenida Antônio Carlos 6627, 31270901 Belo Horizonte/MG, Brazil., Teixeira AP; Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Avenida Antônio Carlos 6627, 31270901 Belo Horizonte/MG, Brazil., Lago RM; Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Avenida Antônio Carlos 6627, 31270901 Belo Horizonte/MG, Brazil., Serp P; University Toulouse, ENSIACET, UPS INP LCC, Lab Chim Coordinat, UPR 8241,CNRS, 4 Allee Emile Monso, BP 44362, F-31030 Toulouse, France., Cardeal ZL; Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Avenida Antônio Carlos 6627, 31270901 Belo Horizonte/MG, Brazil. Electronic address: zenilda@ufmg.br.
Jazyk: angličtina
Zdroj: Analytica chimica acta [Anal Chim Acta] 2015 May 11; Vol. 873, pp. 51-6. Date of Electronic Publication: 2015 Mar 05.
DOI: 10.1016/j.aca.2015.02.063
Abstrakt: 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 μg L(-1)) and determination coefficient (R(2) > 0.9810). The limit of detection ranged from 0.05 to 0.42 μg L(-1) with limit of quantification from 0.18 to 1.40 μg 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.
(Copyright © 2015 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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