سال انتشار: ۱۳۹۳
محل انتشار: همایش ملی شیمی پاک
تعداد صفحات: ۱
Khalil Farhadi – Department of Chemistry, Faculty of Science , Urmia, Iran
Reza Foroutani – Young Researchers and Elite Club, Miyaneh Branch, Islamic Azad University, Miyaneh, Iran
Polycyclic aromatic hydrocarbons (PAHs) are a large group of organic compounds with two or more fused aromatic rings. They are formed during the incomplete burning of coal, oil and gas, garbage, or other organic substances like tobacco or char-broiled meat. They are found throughout the environment in the air, water, and soil. PAHs have been of significant environmental concern over the past years due to their carcinogenic and mutagenic properties (UN-ECE, 1999; Kawanaka et al., 2004). Moreover, they show a high persistency and low biodegradability in the environment (Vo-Dinh et al., 1998). For these reasons, PAHs are listed as priority pollutants by United States Environmental Protection Agency（USEPA、1992) and World Health Organization drinking-water criteria. However, as PAHs are present in trace levels in environmental matrices, a suitable and sensitive extraction method is required. There have been numerous extraction methods developed over the years to assess PAHs concentration in environmental matrices. Among these methods, solid phase microextraction (SPME) has emerged as an innovative extraction technique devised by Janus Pawliszyn in late 1989 (Lord et al., 2000; Zhang et al., 1994; Chen et al., 1995). Pawliszyn introduced the solid-phase microextraction (SPME) as a modern alternative technique to traditional sample preparation technology . In this work Fe3O4-Polyaniline (PAni) nanocomposite was synthesized by using polystyrene as a template for Fe3O4-Pani composite and then remove of polystyrene by DMF solvent . The Fe3O4-PAni nanocomposite was uniform and compact which was confirmed by SEM. The prepared nanomaterial was immobilized onto a stainless steel wire for fabrication of the SPME fiber. The fiber was evaluated for the extraction of some polycyclic aromatic hydrocarbons (PAHs) from aqueous sample solutions in combination with gas chromatography-mass spectrometry (GC-MS). Analytical merits of the method, under optimum conditions (extraction temperature: 90 oC, extraction time: 30 min, desorption temperature: 260 oC, desorption time: 2 min, salt concentration: 20% (w/v), are 70 mg L-1 and 0.20–100 mg L-1 for LOD and LDR, respectively. In optimum conditions, the repeatability for one fiber (n = 3), expressed as relative standard deviation (R.S.D. %), was between 4.3 % and 9.7% for the test compounds. The developed method offers the advantage of being simple to use, with shorter analysis time, lower cost of equipment, thermal stability of fiber and high relative recovery in comparison to conventional methods of analysis.