title: Analysis of xylene in aqueous media using needle-trap microextraction with a carbon nanotube sorbent.
abstract: This paper describes a new extraction technique with needles and a sorbent based on carbon nanotubes to analyze trace amounts of three isomers of xylenes in aqueous samples. In this research, results have been compared with one commercial sorbent. The synthesized sorbent was prepared using sol-gel technology and was packed into 20 gauge needles, and the same size needle was used for packing the commercial sorbent. In the extraction process, a purge and trap sampling methodology is developed, so purging and trapping cycles were performed by a sampling pump. Optimized conditions for standard xylene samples have been obtained, and eight urine samples from workers that were exposed to xylene in the workplace were collected and analyzed. Experimental parameters such as limits of detection and quantification were investigated, and these two parameters were <1 μg/L.
authors.affiliation: Department of Occupational Health, Research Center for Health Sciences, School of Public health, Hamadan University of Medical Sciences, Hamadan, Iran.
authors.forename: Sara Karimi
authors.initials: SK
authors.lastname: Zeverdegani
authors.forename: Abdulrahman
authors.initials: A
authors.lastname: Bahrami
authors.forename: Masoud
authors.initials: M
authors.lastname: Rismanchian
authors.forename: Farshid Ghorbani
authors.initials: FG
authors.lastname: Shahna
mesh_terms: D000327:Adsorption; D007536:Isomerism; D037742:Nanotubes, Carbon / Q000737:chemistry; D052617:Solid Phase Microextraction / Q000295:instrumentation / Q000379:methods*; D014992:Xylenes / Q000032:analysis / Q000302:isolation & purification*
chemical_list: D037742:Nanotubes, Carbon; D014992:Xylenes
keywords: Carbon nanotubes; Extraction; Sol-gel process; Sorbents