Analysis of mercury (II) in laboratory wastewater using standardized Chitosan- modified Sol-Gel derived Electrode (ChSGE) for Differential Pulse Adsorptive Voltammetry (DPAdSV)

Date

10-2002

Degree

Bachelor of Science in Agricultural Chemistry

Adviser/Committee Chair

Norriel S Nipales

Co-adviser

Josefina L. Solivas

Committee Member

Katherine Anne T. Castillo

Abstract

The voltammetric study of chitosan-modified sol-gel derived electrode (ChSGE) was investigated in evaluating its potential as a substitute for commercially available working electrodes. Electrochemical characteristics of ChSGE using cyclic voltammetry showed a potential window from -1500mV to +1000mV. Two major electrochemical techniques were employed in this study, the use of differential Pulse Adsorptive Stripping Voltammetry (DPAdSV) to determine mercury (II) concentration and Differential Pulse Voltammetry (DPV) to determine blank measurements. Conditions for Differential Pulse Adsorptive Stripping Voltammetry using ChSGEs were also optimized to improve its stability. The modifier (300mg), which consisted of 20PA chitosan and 80% graphite powder encapsulated by 13004. sot was used, improve stability of the electrode surface. Electrode regeneration was done using 0.IM EDTA solution. A maximum time of three hours was required to completely regenerate the surface of electrode. Synthetically prepared mercury (II) solutions gave readings of 31.0 ± 9.4 for 30ppm mercury (11) concentration and 68.7± 14.1 for 70ppm mercury (II) concentration. Amount of mercury (II) in laboratory wastewater samples was determined by spiking with 20ppm mercury (II) standard and gave an average value of 7± 13 ppm using DPAdSV. Further studies on the stability and homogeneity of the modified electrodes are recommended in order to lower the standard deviation on the performed analyses.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2002 A13 J38

Document Type

Thesis

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