A New Approach Towards Modified Single Drop Microextraction Using Solvents with Densities Higher than Water

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Dehghan, Milad | 2013

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 44847 (03)
University: Sharif University of Technology
Department: Chemistry
Advisor(s): Bagheri, Habib
Abstract:
In the present work, the combination of single drop liquid phase microextraction and gas chromatography-mass detector (GC-MS) was used for determination of pesticides, Clodinafop, Haloxyfop and Fenoxyprop in natural water samples. a novel techniques based on SDME for develop in which solvents with higher density than water was successfully used. this technique could overcome some limitations of conventional SDME such as instability of organic droplet and limited stirrer rate in which result increasing the mass transfer rate and extraction efficiency. Experimental liquid phase microextraction (LPME) conditions, such as extracting solvent, stirring rate, micro drop volume, extraction time, pH and ionic strength of sample solution were optimized. Then figure of merit were carefully evaluated on the optimum conditions. Finally, in order to evaluate the practical application of the method, the relative standard deviations of analytes are (RSD%, n=6) (5.4), (6/8), (8/3) linearity range (0.1-300 µgL-1) and the limit of detection (LOD’s) (0.02 µgL-1), were determined
Keywords:
Gas Chromatography/Mass Spectrometry (GC/MS) ; Herbicides ; Liquid Phase Microextraction

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