Voltammetric determination of lead (ll) using Onion Modified Carbon Paste Elecrode (OMCPE)

Date

4-2005

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Elmer Rico E. Mojica

Abstract

QUINTOS. LOVE ALAIN M., University of the Philippines Los Banos, March 2005, Voltammetric Determination of Lad (H) using Onion Modified Carbon Paste Electrode (OMCPE).

Adviser: Elmer Rico E. Mojica

The voltammetric determination of lead (II) using onion modified carbon paste electrode (OMCPE) was evaluated as a substitute for commercially available working electrodes. The electrochemical property of the modified electrode was determined through cyclic voltammetry using the potential window between -1500 to 1500 mV. A peak characteristic of the oxidation of Pb2+ (between -600 to -400 mV) was observed after preconcentration in a lead (II) solution. Optimization of experimental parameters for lead (II) analysis was done. The optimized parameters were 30 % modifier, 0.1 M HCI as supporting electrolyte, 3 minutes accumulation time, pH 7 of the accumulating solution, 100 seconds deposition time, and -1000 mV deposition potential. The electrodes were regenerated by multiple stripping and by soaking in 0.01 M EDTA solution. The selectivity of OMCPE towards lead (II) was analyzed by studying the interferences from other metals with copper giving the highest signal and possibly the major interference in lead (II) analysis. The LOD and LOQ of the fabricated carbon paste electrode were determined and found to be 0.29 and 0.96 ppm respectively. Analysis of the laboratory waste sample using DPASV and AAS gave a lead (II) concentration equal to 0.7743 ppm and 2.2 ppm respectively.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2005 C4 Q58

Document Type

Thesis

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