Preliminary investigation on the analysis of mercury (II) solutions by Differential Pulse Adsorptive Stripping Voltammetry (DPAdSV) using a coconut Coir-Modified Sol- Gel Electrode (CoMSGE)

Date

4-2002

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Norriel S Nipales

Abstract

Coconut coir contains aliphatic and phenolic hydroxyl groups, which are capable of cation exchange. As an electrode modifier, it has the ability to form complexes with metal ions due to the presence of these functional groups. which serve as potential binding sites for metal adsorption during the ion-exchange process. The sol-gel method was used to encapsulate coconut coir in order to enhance electrode stability. The coconut coir — modified sol-gel electrode (CoMSGE) has shown high affinity towards mercury (II) ions. Optimum conditions for mercury (11) analysis by differential pulse adsorptive stripping voltammetry (DPAdSV) were determined to be 10 minutes accumulation time. 120 seconds deposition time and 0.1 M HCI as supporting electrolyte during the voltammetric run. No specific trend in pH of acctunulating solution was observed. Electrode surface regeneration was also investigated by immersing the electrode for 40 minutes in 0.1 M EDTA solution. CoMSGE exhibited a limit of detection (LOD) of 0.45 ppm and a limit of quantification (LOQ) of 1.51 ppm. The mercury (11) concentration present in a laboratory waste sample was determined using DPAdSV with CoMSGE as the working electrode. The results were compared using a standard analytical procedure such as the Vapor Atomic Absorption Spectrometry (AAS) method. The values obtained using CoMSGE gave relatively comparable results with that of AAS.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Document Type

Thesis

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