title: Membrane protected conductive polymer as micro-SPE device for the determination of triazine herbicides in aquatic media.
abstract: A micro-SPE technique was developed by fabricating a rather small package including a polypropylene membrane shield containing the appropriate sorbent. The package was used for the extraction of some triazine herbicides from aqueous samples. Solvent desorption was subsequently performed in a microvial and an aliquot of extractant was injected into GC-MS. Various sorbents including aniline-ortho-phenylene diamine copolymer, newly synthesized, polypyrrole, multiwall carbon nanotube, C18 and charcoal were examined as extracting media. Among them, conductive polymers exhibited better performance. Influential parameters including extraction and desorption time, desorption solvent and the ionic strength were optimized. The developed method proved to be rather convenient and offers sufficient sensitivity and good reproducibility. The detection limits of the method under optimized conditions were in the range of 0.01-0.04 ng/mL. The RSDs at a concentration level of 0.1 ng/mL were obtained between 4.5 and 9.3% (n=5). The calibration curves of analytes showed linearity in the range of 0.05-10 ng/mL. The developed method was successfully applied to the extraction of selected triazines from real water samples. The whole procedure showed to be conveniently applicable and quite easy to manipulate.
authors.affiliation: Environmental and Bio-Analytical Laboratories, Department of Chemistry, Sharif University of Technology, Tehran, Iran. bagheri@sharif.edu
authors.forename: Habib
authors.initials: H
authors.lastname: Bagheri
authors.forename: Faezeh
authors.initials: F
authors.lastname: Khalilian
authors.forename: Mehrnoush
authors.initials: M
authors.lastname: Naderi
authors.forename: Esmaeil
authors.initials: E
authors.lastname: Babanezhad
mesh_terms: D000327:Adsorption; D000814:Aniline Compounds / Q000737:chemistry; D002606:Charcoal / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D006540:Herbicides / Q000032:analysis*; D008567:Membranes, Artificial; D037742:Nanotubes, Carbon / Q000737:chemistry; D010655:Phenylenediamines / Q000737:chemistry; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry; D011126:Polypropylenes / Q000737:chemistry*; D011758:Pyrroles / Q000138:chemical synthesis / Q000737:chemistry; D052617:Solid Phase Microextraction / Q000295:instrumentation / Q000379:methods*; D014227:Triazines / Q000032:analysis*; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D000814:Aniline Compounds; D006540:Herbicides; D008567:Membranes, Artificial; D037742:Nanotubes, Carbon; D010655:Phenylenediamines; D011108:Polymers; D011126:Polypropylenes; D011758:Pyrroles; D014227:Triazines; D014874:Water Pollutants, Chemical; D014867:Water; D002606:Charcoal; C067635:polypyrrole; C034193:1,2-diaminobenzene; C023650:aniline