7919

7367

كارشناسي ارشد

شيمي تجزيه

اصفهان: دانشگاه صنعتي اصفهان، دانشكده شيمي

1391

سيزده،68ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

علي اصغر انصافي

بهزاد رضايي

9/6/92

تقي خياميان، تقي جعفري

شيمي

ID7367

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Determination of trace amount of cadmium using solid phase extraction and modified NiFe2O4 magnetic nanoparticles liquid liquid liquid microextraction coupled with in situ differential pulse voltammetry for determination of Chlorpromazine Mansoure Keramat m keramat chem@yahoo com Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 I R Iran Degree M Sc Language Farsi Supervisor A A Ensafi Prof Ensafi@cc iut ac ir Abstract In this thesis a fast sensitive and simple method based on magnetic nanoparticles MNPs modified 3 trimethoxysilyl 1 propanthiol as an adsorbent has been developed for extraction preconcentration and determination of trace amounts of Cd II in environmental samples These magnetic nanoparticles can be easily dispersed in aqueous samples and retrieved by the application of external magnetic field via a piece of permanent magnet The main factors affecting the extraction efficiency such as pH value sample volume eluent concentration stirring time and interferences ions have been investigated and established Under the optimal conditions high preconcentration factor 333 were achieved The limits of detection was as low as 0 07 g L 1 The prepared sorbent was applied for preconcentration of trace amounts of Cd II in the various water samples with satisfactory results In the second work the applicability of microporous membrane based liquid liquid liquid microextraction was evaluated for the extraction and preconcentration of chloropromazine prior to their determination by differential pulse voltammetry The target drug was extracted from 5 mL of aqueous solution donor phase 0 08 M NaOH into an organic extracting solvent n dodecane impregnated in the porous of a polymeric microporous membranec and finally back extracted into 200 L of aqueous acidic solution located inside the extraction cell In order to obtain high extraction efficiency the parameters affecting the extraction including pH of the source and receiving phases the type of receiving and organic phases ionic strength stirring rate and extraction time were studied and optimized Under the optimized conditions enrichment factors up to 18 5 were achieved The calibration curve were obtained in the range of 0 005 75 M with reasonable linearity R2 0 99 and a limit of detection of 0 0025 M based on S N 3 The results indicated that Microporous membrane based liquid liquid liquid microextraction method has excellent clean up and high preconcentration factor and can be served as a efective and sensitive method for monitoring of the drug in biological samples Keywords Cadmium Magnetic solid phase extraction Flame atomic absorption spectrometry Chlorpromazine Microporous membrane based liqud liqud liqud microextraction Voltammetry Multiwall carbon nanotubes paste electrode PDF created with pdfFactory trial version www pdffactory com

علي اصغر انصافي

بهزاد رضايي

تقي خياميان، تقي جعفري