پديد آورنده :
كياني، رعنا
عنوان :
بررسي اثر بخار آب بر زمان رانش يون هاي محصول در طيف سنجي تحرك يوني
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
شيمي فيزيك
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده شيمي
صفحه شمار :
[هشت]، ۸۱ص.: مصور، جدول، نمودار
استاد راهنما :
محمود تبريزچي
استاد مشاور :
حسين فرخ پور
توصيفگر ها :
طيف سنجي تحرك يوني , كسر مولي , دستگاهوري , مواد منفجره , دستگاه مولد پالس , اكستازي
استاد داور :
بيژن نجفي، محمد ژياني
تاريخ ورود اطلاعات :
1396/12/20
چكيده انگليسي :
Investigation of the Effect of Humidity on Drift Time of Product Ions in Ion Mobility Spectrometry Rana Kiani Jan 03 1022 Department of Chemistry Isfahan University of TechnologyDegree M Sc Language FarsiAbstractIon mobility spectroscopy is used to identify chemical species especially narcotics and explosives This technique is based on ion mobility which depends on temperature pressure ion nature andmolecules in which the ion moves Peaks are displaced by the temperature and the pressure Foreach material at certain temperature and pressure there are certain characteristic peaks that can beused to identify the materials The moisture content of the gas also has a significant effect on thedisplacement of the peaks which can lead to an error in the identification of the materials Thesestudies have been carried out on reactant species in IMS Research Laboratory of Isfahan Universityof Technology In this research the effect of water vapor on drift time of product species has beeninvestigated For this purpose two kinds of materials narcotics and explosives were selected Theionization source used in this project was Corona Because of the high proton affinity of narcotics positive Corona has been used and the reactant ion selected for this group of materials wasammonium Also Due to the high electron affinity of explosives we used negative Corona and alsochlorine ion as the reactant ion The experiments were carried out at three different temperatures 100 220 and 260 degrees Celsius The moisture saturated water vapor was introduced to thesystem in intervals of 20 cm3 min from 0 to 200 cm3 min and through the drift gas The overallhumidity the total humidity of the environment and the added water vapor was measured by thewater vapor concentration monitor in ppm In dry condition where the amount of steam addedthrough the gas to the tubes was zero the moisture content is 21 ppm By adding moisture thepeaks moved toward the drift time Our results showed that the inverse of the drift time changeslinearly with the logarithm of water concentration This behavior is similar to the behaviorobserved for reactant ions However in this case the slope is less and there are no significantchanges for heavy ions The reason for this observation is the lack of absorption of water moleculesby massive heavy ions Applying the results of our project it is possible to predict and correct thedisplacement of peaks due to environmental humidity penetration and minimize identification error
استاد راهنما :
محمود تبريزچي
استاد مشاور :
حسين فرخ پور
استاد داور :
بيژن نجفي، محمد ژياني
