Voltammetric analysis of lead (II) using carbon paste electrode modified with cucumber (Cucumis sativus) peelings"

Date

4-2005

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Elmer Rico E. Mojica

Abstract

ABSTRACT

ONCINIAN, KATHRYN PADUA. University or the Philippines Los Banos, March 2005. Voltammetris Analysis of Lead (II) using Carbon Paste Electrode Modified with Cucumber (Cucumis sativus) Peelings.

Adviser: Prof. Elmer Rico E.Mojica

The use of fresh cucumber peelings as modifier in the fabrication of carbon paste electrode (cucumbertrode) was investigated for its application in the electrochemical analysis of lead (II). In aqueous solution, lead (II) ions were concentrated on the electrode on the basis of its interaction, possibly by ion exchange. with several functionalities of the protease present in the cucumber peelings with emphasis on sulfhydryl groups. Cyclic voltammetry (CV) was used to determine the potential window. which is at -1.4011 to -1,511(1 mV. lead (II) ions were detected through the current peaks at voltage range from -O.6 to -0.4 volts. the optimum conditions using DPASV analysis with cucumber, as the modifier were the use of 0.01 M IICI as the supporting electrolyte, 210 seconds accumulation time. 30 % modifier composition, 60 seconds deposition time and -1,400 mV deposition potential. Combination of multiple stripping followed by 10 minutes of soaking of the cucumbertrode in 0.01 M EDTA was done for electrode regeneration.

The cucumbertrode was used for the analysis of lead content in actual laboratory waste sample. which was compared with the results of standard AAS method. The calculated LOD and LOQ were 0.91254 and 3.0415, respectively.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2006 C4 O55

Document Type

Thesis

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