Magnetic N-doped carbon nanotubes: A versatile and efficient material for the determination of polycyclic aromatic hydrocarbons in environmental water samples.
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.
Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Avenida Antônio Carlos 6627, 31270901 Belo Horizonte/MG, Brazil.
Helvécio Costa
HC
Menezes
Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Avenida Antônio Carlos 6627, 31270901 Belo Horizonte/MG, Brazil.
Stella Maris Resende
SM
de Barcelos
Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Avenida Antônio Carlos 6627, 31270901 Belo Horizonte/MG, Brazil.
Damiana Freire Dias
DF
Macedo
Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Avenida Antônio Carlos 6627, 31270901 Belo Horizonte/MG, Brazil.
Aluir Dias
AD
Purceno
Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Avenida Antônio Carlos 6627, 31270901 Belo Horizonte/MG, Brazil.
Bruno Fernades
BF
Machado
Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Avenida Antônio Carlos 6627, 31270901 Belo Horizonte/MG, Brazil.
Ana Paula Carvalho
AP
Teixeira
Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Avenida Antônio Carlos 6627, 31270901 Belo Horizonte/MG, Brazil.
Rochel Monteiro
RM
Lago
University Toulouse, ENSIACET, UPS INP LCC, Lab Chim Coordinat, UPR 8241,CNRS, 4 Allee Emile Monso, BP 44362, F-31030 Toulouse, France.
Philippe
P
Serp
Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Avenida Antônio Carlos 6627, 31270901 Belo Horizonte/MG, Brazil. Electronic address: zenilda@ufmg.br.
Zenilda Lourdes
ZL
Cardeal
D000327:Adsorption; D001938:Brazil; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D004867:Equipment Design; D008401:Gas Chromatography-Mass Spectrometry / Q000295:instrumentation / Q000379:methods; D060106:Lakes / Q000032:analysis*; D057230:Limit of Detection; D059346:Magnets / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D052616:Solid Phase Extraction / Q000295:instrumentation* / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis*
D004129:Dimethylpolysiloxanes; D037742:Nanotubes, Carbon; D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical; C013830:baysilon
Carbon nanotubes; Gas chromatography/mass spectrometry; Polycyclic aromatic hydrocarbons; Water analysis