Voltammetric determination of copper (II) using a carbon paste electrode modified with tannins

Date

4-2008

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Jose Rene L. Micor

Abstract

PALAFOX, JOSE MA. VITO PERLAS. University of the Philippines Los Banos, March 2008. Voltammetric Determination of Copper (II) Using a Carbon Paste Electrode Modified with Tannins.

Adviser: Jose Rene L. Micor.

Carbon paste electrodes modified with tannins (TACPE) were fabricated using tannic acid and characterized thru cyclic voltammetry (CV) and differential pulse anodic stripping voltammetry (DPASV). It was found to detect Cu (II) in solution at ppm levels via DPASV at the range of 0.0 to 100 mV. Optimization of parameters to further improve sensitivity by adjusting various parameters has shown that (a) 25% w/w modifier carbon paste, (b) accumulated in pH 5 solution for (c) 120 seconds, (d) analyzed in 0.01 M HCI supporting electrolyte, using dpasv for (e) 51.3 seconds deposition time under a (f) -1000 mV to +1000mV deposition potential range gave the TACPE the highest sensitivity. Reuse thru the regeneration of the TACPE can be performed using multiple stripping voltammetry. Despite low interference by Zn (II), Hg (II), Pb (II), TACPEs has a computed limit of detection of 5.4575ppm and 18.1915ppm limit of quantification, with a linearity coefficient of 0.8086. Comparison with Atomic Absorption Spectroscopy (AAS) analysis, the current benchmark in soluble metal detection has shown that TA-CPE has 31.47% error against AAS. Alternative tannin sources obtained from air-dried bark of Diospyros phdippinensis and Casuarina. equiselifidia have been observed to have high sensitivity to Cu (II) in solution.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2008 A13 P35

Document Type

Thesis

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