7694

7165

كارشناسي ارشد

شيمي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده شيمي

1391

سيزده،62ص.: مصور،جدول،نمودار﴿رنگي﴾

ص.ع.به فارسي و انگليسي

محمد سراجي، محمدتقي جعفريان

17/2/92

تقي خياميان، بهزاد رضايي

شيمي

ID7165

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Determination of metalaxyl fungicide in vegetables using microextraction in packed syringe and electrospray ionization ion mobility spectrometry Razieh Parchami r parchami@ch iut ac ir December 2012 Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Lanquage Farsi Superviors Assoc Prof Mohammad Saraji saraji@cc iut ac ir Assist Prof Mohammad Taghi Jafari jafari@cc iut ac ir Abstract In this study the combination of hot water extaction microextraction in packed sorbent and ESI IMS was used for preconcentration and determination of metalaxyl in cucumber lettuce and cabbage Ion mobility pectrometry with electrospray ionization source as an inexpensive and rapid technique used for determination of metelaxyl fungicide In this work at the first flocculation of pigments and fibers were performed and matrix of samples was converted into the extractable solution by MEPS technique Microextraction by packed sorbent is a new development in the field of sample preparation This method is the miniaturization of conventional solid phase extraction SPE MEPS retains the high selectvity and good sample purification and extraction yields of SPE while being fast feasble and using small amounts of samples MEPS was performed by using 1 6 mg of sorbent Oasis HLB inserted into a 250 L gas tight syringe The solid phase material is fixed in the syringe as a pluge using polyethylene frits The effect of various parameters such as sampling rate volume of elution solvent volume of washing solution and the number of extraction cycles were investigated In MEPS sorbent was conditioned first with methanol and then with purified water 2 200 L each solvent before being used for the first time The solution 200 L in each cycle was drawn through the syringe and discard in waste extract discard with speed of 2 4 L s Extraction of analyt was performed by withdrawing 800 L 4 200 L of sample solution by using stirring motor The solid phase was then washed with 100 L purified water to remove interferences The sorbent was dried by a gentle stream of nitrogen gas during 10 minutes The analytes were then eluted with 20 L methanol at speed of 1 0 L s The eluent was injected directly to ESI IMS injector The results of the analysis of selected samples showed that the samples were free of metalaxyl The limit of detection was obtained 2 3 g L and the relative standard deviations were under 10 The applicability of the proposed methods was demonstrated by analyzing spiked samples Recoveries were ranged from 64 to 78 Keywords Microextraction in packed syringe Electrospray ionization ion mobility spectrometry metalaxyl

محمد سراجي، محمدتقي جعفريان

تقي خياميان، بهزاد رضايي