4130

3902

كارشناسي ارشد

شيمي تجزيه

اصفهان : داتشگاه صنعتي اصفهان،دانشكده برق و كامپيوتر

1386

چهارده ، 89 ،[II] ص : مصور ، جدول ، نمودار

ص . ع . به: فارسي و انگليسي

محمد سراجي

20/7/1387

اسماعيل شمس سولاري، تقي خياميان

مهندسي برق و كامپيوتر

ID3902

به فارسي و انگليسي : قابل رويت در نسخه ديجيتال

Abstract In this research two extraction methods i e static and dynamic liquid phase microextraction LPME were used to extract PAHs from water samples GC MS was used for separation and determination of the analytes In the static LPME extraction was perforned by a 12 l toluene drop hanging from needle tip of a 50 l syringe A volume of 18 ml of water was used for extraction At the end of extraction time the solvent was withdrawn into the microsyringe The microsyringe content was transferred into a capillary vial 1 1 mm ID The capillary vial was heated in a heating oven at 75 C to decrease solvent volume to 3 l Using a 10 l GC syringe the solvent was withdrawn and injected into the GC MS The effect of parameters such as stirring rate different drop volumes ionic strength extraction temperature acetone content in the aqueous solution and the extraction time were studied The optimum extraction performance was achieved by 12 l solvent volume stirring rate of 400 rpm extraction time of 30 minute at room temperature and 5 percent acetone aqueous solvent with no salt addition In the dynamic method a variable speed motor was used to produce a rotational movement which was then converted to a piston like movement 3 l toluene solvent containing internal standard was withdrawn into a 50 l microsyringe Before the extraction the internal surface of microsyringe barrel was deactivated by dichlorodimethylesilane The microsyringe barrel was then completely washed by acetone and methanol and used for extraction During the extraction the plunger moves in and out of the microsyringe barrel at a constant rate At the end of the extraction the solvent was transferred into the capillary vial The sample was then injected into the GC MS using a 10 l GC syringe The effect of experimental parameters such as plunger movement speed ionic strength of the solution the acetone content of solution sampling volume extraction temperature and extraction time were studied The optimum extraction performance was achieved at a withdrawal rate of 1 67 l s extraction time of 20 minutes extraction temperature of 40 C sampling volume of 50 l and 5 percent acetone in aqueous solution with no salt addition The enrichment factors were in the range of 173 440 for static LPME and 68 303 for dynamic LPME Relative standard deviation of 3 3 10 8 percent was obtained for static and 3 5 10 9 percent for dynamic LPME The detection limits between 0 031 1 6 ng l for the static and 0 061 3 3 ng l for the dynamic LPME were obtained Two real samples ZayandeRood Isfahan and Kashkan Lorestan river water samples were analyzed by the proposed methods pdfMachine Is a pdf writer that produces quality PDF files with ease Produce quality PDF files in seconds and preserve the integrity of your original documents Compatible across nearly all Windows platforms if you can print from a windows application you can use pdfMachine Get yours now

محمد سراجي

اسماعيل شمس سولاري، تقي خياميان