Carbon nanotube field-effect transistor detector associated to gas chromatography for speciation of benzene, toluene, ethylbenzene, (o-, m- and p-)xylene.
An analytical methodology based on a field-effect transistor detector using carbon nanotubes (NTFET) coupled to a gas chromatograph has been developed for the speciation of the following aromatic compounds: benzene, toluene, ethylbenzene, m-xylene, p-xylene and o-xylene (BTEX). This methodology combines the proven separation capability of gas chromatography (GC) with the potential for detection of a NTFET. The developed analyzer shows a high and stable analytical response upon repeated analysis of BTEX during 4 weeks, with detection limit less than 4mug/L. The GC-NTFET system also shows a great suitability for actual monitoring of indoor atmospheres and no significant difference was observed between the results obtained by the developed analyzer and a more classical analytical methodology, namely gas chromatography-flame ionization detection (GC-FID).
Silva
Lurdes I B
LI
ISEIT/Viseu-Instituto Piaget, Estrada do Alto do Gaio, Galifonge, 3515-776 Lordosa, Viseu, Portugal. lisilva@ua.pt
Ferreira
Filipe D P
FD
Rocha-Santos
Teresa A P
TA
Duarte
A C
AC
D000393:Air Pollutants / Q000032:analysis*; D000395:Air Pollutants, Occupational / Q000032:analysis; D001554:Benzene / Q000032:analysis*; D001555:Benzene Derivatives / Q000032:analysis*; D002849:Chromatography, Gas / Q000295:instrumentation*; D006841:Hydrocarbons, Aromatic / Q000032:analysis; D008832:Microchemistry / Q000379:methods; D037742:Nanotubes, Carbon; D011174:Portugal; D014173:Transistors, Electronic
D000393:Air Pollutants; D000395:Air Pollutants, Occupational; D001555:Benzene Derivatives; D006841:Hydrocarbons, Aromatic; D037742:Nanotubes, Carbon; D001554:Benzene