شماره ركورد كنفرانس :
3550
عنوان مقاله :
A post synthetic modified metal organic framework based fiber coating for solid phase microextraction of organophosphorus pesticides
پديدآورندگان :
Javanmardi Hasan Environmental and Bio-Analytical Laboratories, Department of Chemistry, Sharif University of Technology, Tehran, Iran , Bagheri Habib bagheri@sharif.edu Environmental and Bio-Analytical Laboratories, Department of Chemistry, Sharif University of Technology, Tehran, Iran, , Soofi Gohar Environmental and Bio-Analytical Laboratories, Department of Chemistry, Sharif University of Technology, Tehran, Iran , Abbasi Alireza School of Chemistry, College of Science, University of Tehran, Tehran, Iran
كليدواژه :
Post synthetic modified metal organic framework , Organophosphorus pesticides , Direct immersion–solid phase microextraction , Gas chromatography–mass spectrometry
عنوان كنفرانس :
بيست و پنجمين سمينار ملي شيمي تجزيه انجمن شيمي ايران
چكيده فارسي :
Separation and extraction processes are usually required prior to the instrumental analysis either due to low analytes concentrations or/and sample complexity. Solid phase microextraction (SPME) is a fascinating, sensitive and rapid method which has been successfully applied for the sampling, pretreatment and preconcentration analysis of a wide variety of compounds, in both headspace (HS) and direct immersion (DI) modes. In this methodology, sampling, extraction, preconcentration and sample introduction are combined in one step and usually needs no desorbing solvent [1, 2]. Metal organic frameworks (MOFs) have emerged as a new class of porous crystalline materials that are based on the coordination of metal ions or clusters with bi-or multidentate organic linkers. MOFs, due to their outstanding properties such as high surface area, great potential for post synthetic modification (PSM), uniform structure cavities and high hydrothermal stability have been developed in research areas including catalysis, sensing, gas storage and drug delivery [3]. In the current work, a chromium based MOF (MOF1) was synthesized with hydrothermal method and then modified with acetic anhydride in a PSM process to achieve MOF2 [4]. Both MOFs were fabricated, as SPME fiber coatings, via sol–gel methodology on the stainless steel substrate and after conditioning, they were examined for the extraction of some organophosphorus pesticides including diazinon, fenthion, profenophos, ethion, and phosalone in DI mode. The fiber coating based on MOF2 was superior extraction capability and selected for the following experiments. Influencing parameters affecting the DI–SPME analysis and gas chromatography–mass spectrometry (GC–MS) procedure such as desorption time (5 min) and temperature (260 oC), extraction time (20 min) and temperature (25 oC), ionic strength (0 w/v % NaCl) and sample stirring rate (1000 rpm) were investigated and optimized.
