Fabrication of feather-modified carbon paste electrode (feathertrode) for the analysis of Lead (II) by differential pulse anodic stripping voltammetry (DPASV)

Date

10-2003

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Elmer Rico E. Mojica

Abstract

TOCINO, ARLENE B. College of Arts and Sciences, University of the Philippines, Los Banos, October 2003. Fabrication of Feather-Modified Carbon Paste Electrode (feathertrode) for the Analysis of Lead (II) by Differential Pulse Anodic Stripping Voltammetry.

Adviser: Prof. Elmer Rico E. Mojica

Feather consists of 91 % protein, 1.3 % fat and 7.9 % water. It exhibits high affinity toward lead ions since it contain high amount of water insoluble proteins. These proteins generally contain large quantities of sulfur-containing amino acids particularly cysteine which has the ability to form strong disulfide bonds. As an electrode modifier, it has the ability to form complexes with the metal ions due to the presence of the thiol and disulfide groups, which serve as the binding sites for metal adsorption during the ion-exchange process. This study explored the use of fabricated feather modified carbon paste electrode for the analysis of lead (II) by differential pulse anodic stripping voltammetry. Optimization of the experimental parameters for the voltammetric applications was conducted. Optimum response were observed with the following parameters: 0.01 M HCI supporting electrolyte, accumulating solution with pH 6, 15 (w/w) modifier composition, 4 minutes accumulation time, 300 seconds deposition time and -1500 mV deposition potential. Regeneration of the electrode surface was also investigated by applying multiple stripping. The fabricated feather modified carbon paste electrode gave a sensitivity of 1.3411 pA/ppm, limit of detection (LOD) of 0.83 ppm and limit of quantification (LOQ) of 2.76 ppm. Analysis of the laboratory waste sample was done using the optimized conditions. The lead concentration in the laboratory waste sample using DPASV and Flame AAS were 10.14 ppm and 52.27 ppm respectively.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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