title: A needle trap device packed with a sol-gel derived, multi-walled carbon nanotubes/silica composite for sampling and analysis of volatile organohalogen compounds in air.
abstract: A needle trap device (NTD) packed with silica composite of multi-walled carbon nanotubes (MWCNTs) prepared based on sol-gel technique was utilized for sampling and analysis of volatile organohalogen compounds (HVOCs) in air. The performance of the NTD packed with MWCNTs/silica composite as sorbent was examined in a variety of sampling conditions and was compared with NTDs packed with PDMS as well as SPME with Carboxen/PDMS-coated fibers. The limit of detection of NTDs for the GC/MS detection system was 0.01-0.05 ng mL(-1) and the limit of quantitation was 0.04-0.18 ng mL(-1). The RSD were 1.1-7.8% for intra-NTD comparison intended for repeatability of technique. The NTD-MWCNTs/silica composite showed better analytical performances compared to the NTD-PDMS composite and had the same analytical performances when compared to the SPME-Carboxen/PDMS fibers. The results show that NTD-MWCNTs-GC/MS is a powerful technique for active sampling of occupational/environmental pollutants in air.
authors.affiliation: Department of Occupational Health, Faculty of Health, Hamadan University of Medical Sciences, Hamadan, Iran.
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Heidari
authors.forename: Abdolrahman
authors.initials: A
authors.lastname: Bahrami
authors.forename: Ali Reza
authors.initials: AR
authors.lastname: Ghiasvand
authors.forename: Farshid Ghorbani
authors.initials: FG
authors.lastname: Shahna
authors.forename: Ali Reza
authors.initials: AR
authors.lastname: Soltanian
mesh_terms: D000393:Air Pollutants / Q000032:analysis* / Q000302:isolation & purification; D008401:Gas Chromatography-Mass Spectrometry / Q000295:instrumentation / Q000379:methods*; D005782:Gels / Q000737:chemistry*; D006813:Humidity; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009339:Needles; D012822:Silicon Dioxide / Q000737:chemistry*; D052617:Solid Phase Microextraction; D013696:Temperature; D055549:Volatile Organic Compounds / Q000032:analysis* / Q000302:isolation & purification
chemical_list: D000393:Air Pollutants; D005782:Gels; D037742:Nanotubes, Carbon; D055549:Volatile Organic Compounds; D012822:Silicon Dioxide