Comparison of coating techniques for montmorillonite- modified sol-gel pencil electrodes for the analysis of copper (II) in aqueous solution

Date

10-2004

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Norriel S Nipales

Abstract

Romero, Fedilynn Estareja, College of Arts and Sciences, University of the Philippines Los Banos. Comparison of Coating Techniques for Montmorillonite — Modified Sol — Gel Pencil Electrodes for the Analysis of Copper (II) in Aqueos Solution.

Adviser: Dr. Norriel S. Nipales

A preliminary study established the possibility of using montmorillonite as a modifying material for sol — gel derived electrodes for the Differential Pulse Adsorptive Stripping Voltammetry ( DPAdSV) analysis of copper (II) in aqueous systems. Optimum results were obtained using 30% montmorillonite — graphite powder in 1300 microliter of sol and using the following conditions: a deposition potential of -600mV, deposition time of 180 seconds, accumulating solution with pH 5. These optimum parameters obtained were used in this study to compare three coating techniques for montmorillonite — modified sol gel derived electrodes for improved precision of measurements. The dependence of the peak current response to the analyte concentration was studied by observing the electrode response to different Cu (II) concentration of ten (10) electrodes per type of preparation A linear relationship between peak height and concentration was observed. Among the three methods, the electrodes constructed using spin coating method gave the best linearity of 0.9854 and was the most precise while the layering was the least precise. This was supported by the statistical analysis of the data showing significance differences among the three methods. The accuracy of the electrodes was also accounted by random selection of two electrodes per type of preparation and interpolating the measured peak height to obtain the corresponding concentration. A low % error suggests that the electrodes fabricated using the three methods were of high accuracy. However, the most accurate was the electrodes constructed using spin coating method having a % error of 0.3429.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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