8747

8108

كارشناسي ارشد

شيمي تجزيه

اصفهان: دانشگاه صنعتي اصفهان، دانشكده شيمي

1392

سيزده،83ص.: مصور،جدول،نمودار(رنگي)

ص.ع.به فارسي و انگليسي

محمدتقي جعفري

محمدسراجي

31/1/93

بهزاد رضايي، تقي خياميان

شيمي

ID8108

Measurement of Ethion Pesticide via Dispersive Liquid Liquid Microextraction Method Coupled by Ion Mobility Spectrometer with Corona Discharge Ionization Source DLLME CD IMS Amir Ebrahimi amir ebrahimi@ch iut ac ir January 2014 Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Supervisor Mohammad Taghi JafariE mail Jafari@cc iut ac irAbstract In this research coupling of dispersive liquid liquid microextraction and negativecorona discharge ion mobility spectrometry DLLME NCD IMS was employed forpreconcentration and determination of ethion in grape and underground water The mostcommonly used solvents in DLLME method are chlorinated ones which are dangerous forhuman and environment On the other hand chlorinated solvents have a high electronaffinity resulting in complication of mobility spectrum in addition to diminution insensitivity To overcome these problems cyclohexane was used as the extraction solventwhich is lighter than water and therefore the extraction solvent containing analyte can beaccumulated in upper layer of aqueous phase In this method dispersive solutioncontaining 500 L disperser solvent methanol and 40 L extraction solvent cyclohexane was injected rapidly into an aqueous solution contains ethion in a specialvessel with a syringe After centrifuging of solution at 3000 rpm for 5 min the finedroplets of cyclohexane were collected from the upper area of the extraction vessel Then 2 mL distilled water was injected through the septum located in the bottom of extractionvessel so that the organic phase could be easily collected using a syringe 5 L of thecollected phase was injected into the NCD IMS to analyze the extracted ethion Someimportant parameters such as the kind of extraction and dispersive solvents and theirvolume salt concentration and sample pH were investigated Under optimized conditions linear range 0 2 100 0 g L detection limit 0 075 g L and RSD 7 were obtained In analysis of spiked samples the enrichment factor and extraction recoveries were 60 and68 92 respectively In addition some samples of underground water and grape were alsoanalyzed and the satisfactory results reveal the capability of DLLME NCD IMS forconvenient and very rapid alalysis of real samples Keywords Dispersive liquid liquid microextraction Ion mobility spectrometry Coronadischarge Negative corona Ethion

محمدتقي جعفري

محمدسراجي

بهزاد رضايي، تقي خياميان