Voltammetric determination of lead (ll) using a carbon paste electrode modified with pineapple (Ananas comosus) waste

Date

10-2003

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Elmer Rico E. Mojica

Co-adviser

Hosea L. Matel

Committee Member

Aurea N. Miranda-Chu

Abstract

The voltammetric study of pineapple waste as modifier in the fabrication of carbon paste electrode (piltatrode) was investigated for its application in the electrochemical analysis of lead (11). In aqueous solution, Pb (II) ions were concentrated on the electrode on the basis of its interaction, possibly by ion exchange, with several functionalities of the protease present (bromelain) in the pineapple with emphasis on sulfhydryl groups. Cyclic voltammetry (CV) was used to determine the potential window, which is at -1,200 to +1,500 mV. Lead (II) ions were detected through current peaks at voltage range from -600 to -400 mV. The optimum conditions for differential pulse anodic stripping voltammetry (DPASV) analysis using the pinatrode were the use of 0.01 M phosphate buffer of pH 7.0 for accumulating solution, 0.01 M HGl as the supporting electrolyte, 3 minutes accumulation time, 5% modifier composition, 60 seconds deposition time, and -1,200 mV deposition potential. Combination of multiple stripping followed by 10 minutes soaking of the pinatrode in 0.01 M EDTA of the electrode was done for electrode regeneration. The pinatrode was used for the analysis of lead content in different water samples, which were compared with results of standard AAS method. The calculated LOD and LOQ were 0.9322 ppm and 3.1075 ppm, respectively.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2003 C4 G66

Document Type

Thesis

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