Voltammetric determination of lead (II) using methionine- modified carbon paste electrode

Date

5-2005

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Norriel S Nipales

Abstract

A carbon paste electrode modified with the amino acid methionine was studied for the analysis of lead (11) using cyclic voltammetry (CV) and differential pulse anodic stripping voltammetry (DPASV). Methionine has the ability to form complexes with metal ions due to the presence of the thioether (-S-C113) functional group in its side chain It can serve as the binding site for the metal adsorption during the accumulation process. Optimization of experimental parameters for the analysis was conducted. The optimized parameters were 20% (w/w) modifier, 0 151 !ICI solution as the supporting electrolyte. 120 seconds accumulation time, 30 seconds deposition time, and -800 mV deposition potential Regeneration of the electrode surface was also investigated by multiple stripping. The MMCPE gave a sensitivity of 0.1031 uA/ppm, limit of detection (LOD) of 0 7006 ppm and limit of quantification (1,0Q) of 1.9526 ppm Analysis of the laboratory waste sample was done using the optimized conditions. The lead concentration of the laboratory waste sample using DPASV and flame AAS were 1 197 ppm and 2.200 ppm respectively. Infrared (IR) analysis or MMCPE was conducted Results showed the possibility of leaching of the methionine from the carbon paste

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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