title: A polythiophene-silver nanocomposite for headspace needle trap extraction.
abstract: A nanocomposite consisting of polythiophene-silver was prepared and implemented as a desired sorbent for headspace needle trap extraction. Colloidal silver nanoparticles (Ag NPs) with narrow size distribution and high stability were synthesized in water-in-oil microemulsion. This simple procedure was adapted to prepare highly monodispersed Ag NPs, starting from an initial synthesis in sodium bis(2-ethylhexyl) sulfosuccinate (AOT) reverse micelles. Polythiophene (PT) was synthesized by chemical oxidative polymerization in the presence of anhydrous ferric chloride while its polymeric structure was confirmed by Fourier transform infrared spectrometry (FTIR). Eventually, the prepared PT was dispersed in an AOT/n-decane solution containing Ag NPs for 1h in which the NPs were adsorbed on the polymer surface. The dynamic light scattering (DLS) analysis of NPs solution revealed that the monodisperse Ag NPs have been synthesized successfully with the size distribution below 10nm. Other instrumentations such as scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and atomic absorption spectrometry (AAS) confirmed the fabrication of the PT-Ag nanocomposite. The applicability of the synthesized sorbent was examined by needle trap extraction of some polycyclic aromatic hydrocarbons (PAHs) in aqueous samples in conjunction with gas chromatography-mass spectrometry detection (GC-MS). Important parameters influencing the extraction process were optimized. The linearity for all analytes was in the concentration range of 0.01-10ngmL(-1). The limits of detections were in the range of 0.002-0.01ngmL(-1), using time-scheduled selected ion monitoring (SIM) mode while the RSD% values (n=3) were all below 12%. The developed method was successfully applied to real water samples obtained from different rivers and Persian Gulf, while the relative recovery percentages were in the range of 85-103%.
authors.affiliation: Environmental and Bio-Analytical Laboratories, Department of Chemistry, Sharif University of Technology, P.O. Box 11365-9516, Tehran, Iran. Electronic address: bagheri@sharif.edu.
authors.forename: Habib
authors.initials: H
authors.lastname: Bagheri
authors.affiliation: Environmental and Bio-Analytical Laboratories, Department of Chemistry, Sharif University of Technology, P.O. Box 11365-9516, Tehran, Iran.
authors.forename: Solmaz
authors.initials: S
authors.lastname: Banihashemi
authors.affiliation: Environmental and Bio-Analytical Laboratories, Department of Chemistry, Sharif University of Technology, P.O. Box 11365-9516, Tehran, Iran.
authors.forename: Samaneh
authors.initials: S
authors.lastname: Jelvani
mesh_terms: D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods*; D008401:Gas Chromatography-Mass Spectrometry; D019156:Indian Ocean; D008855:Microscopy, Electron, Scanning; D053761:Nanocomposites / Q000737:chemistry*; D053758:Nanoparticles; D009339:Needles; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D011108:Polymers / Q000737:chemistry*; D045483:Rivers / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D013876:Thiophenes / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons; D011108:Polymers; D013876:Thiophenes; D014874:Water Pollutants, Chemical; C066730:polythiophene; D012834:Silver
keywords: Gas chromatography-mass spectrometry; Needle trap extraction; Polycyclic aromatic hydrocarbons; Polythiophene; Silver nanoparticles