Voltammetric determination of lead (II) using a carbon paste electrode modified with apple (Pyrus malus L.) flesh

Date

4-2004

Degree

Bachelor of Science in Agricultural Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Elmer Rico E. Mojica

Co-adviser

Florinia E. Merca

Committee Member

Quennie B. Manimtim

Abstract

A novel carbon paste electrode modified with apple (Prue males L.) flesh was investigated for voltammetric behavior prior to and after to lead (II) accumulation. The modified electrode demonstrated ability to preconcentrate the metal, and defined peaks were observed upon differential pulse anodic stripping voltammetric analysis. Lead (11) ions were detected through current peaks at voltage range -600 mV to -400 mV. The optimum parameters of the apple-modified carbon paste electrode were the use of 40% (w/w) modifier concentration, 7 minutes accumulation time, 90 seconds deposition time, accumulating solution at pH 6.0, 0.1M 11C1 supporting electrolyte. 0.01 M EDTA as regenerating solution, 5 minutes minimum and 20 minutes maximum regeneration time. The calculated LOQ and LOD of the apple-modified carbon paste electrode were 4.0572 ppm and 1.2172 ppm, respectively. The apple-modified carbon paste electrode was used for the analysis of lead content in sample laboratory wastes, which were compared with the results of standard AAS method.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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