AAU-ETD AAU-ETD
 

Addis Ababa University Libraries Electronic Thesis and Dissertations: AAU-ETD! >
Faculty of Science >
Thesis - Chemistry >

Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/2831

Title: DEVELOPMENT OF PERCHLORATE SELECTIVE COATED GRAPHITE ELECTRODE BASED ON CRYSTAL VIOLET AND ITS APPLICTION TO THE DETERMINATION OF ETHYLENE GLYCOL, GLYCEROL, GLUCOSE AND MANNITOL VIA PERIODATE OXIDATION
Authors: Atnafu, Guadie
Advisors: Dr. Ghirma Moges
Dr. Negussie Megersa
Keywords: ethylene glycol
glucose and mannitol
glycerol
on selective electrode (ISE), coated graphite electrode (CGE
Copyright: Jun-2009
Date Added: 9-May-2012
Publisher: AAU
Abstract: An attempt was made to develop perchlorate-selective coated graphite electrode based on crystal violet using 1-chloronaphthalene as plasticizer. The electrode prepared by coating crystal violet-perchlorate ion association in 1-chloronaphthalene both as the plasticizer and the solvent with a PVC matrix on a graphite rod was found to give a Nernstian response to perchlorate in a wide concentration range. Proper response of the electrode was observed in test solutions made in 0.1 moleL-1 potassium nitrate solution. The linear range, slope, and detection limit from the plot of E vs log [ClO4-] were found to be 1.0 x 10-5-1.0 x 10-1 mol L-1, 58±1.5 mV/decade and 3.16 x 10-6 mole L-1 perchlorate respectively. The electrode was also used to detect periodate with linear range, slope and detection limit of 1.0 x 10-4-1.0 x 10-2 mol L-1, 57±1.5 mV/decade and 5.7 x 10-5 mole L-1 periodate respectively. The response time of the electrode was found to be < 20 s for concentrations higher than 1.0 x 10-4 M and the electrode functioned properly for four weeks. The effect of the amount of the electroactive ion pair was also studied and it was found that electrode prepared from 20-30 mg of the crystal violet perchlorate was chosen with the best response. The effects of diverse ions on the electrode response to perchlorate were studied and the potentiometric selectivity coefficients were evaluated. The electrode was found to be highly selective to perchlorate and periodate. The analytical application of the electrode was extended to the direct determination of perchlorate and periodate and to the indirect determination of ethylene glycol, glycerol, glucose and mannitol via periodate oxidation.
URI: http://hdl.handle.net/123456789/2831
Appears in:Thesis - Chemistry

Files in This Item:

File Description SizeFormat
145728799754210492848360489220287221622307.67 kBAdobe PDFView/Open

Items in the AAUL Digital Library are protected by copyright, with all rights reserved, unless otherwise indicated.

 

  Last updated: May 2010. Copyright © Addis Ababa University Libraries - Feedback