Electrochemistry in a drop : microscale differential pulse anodic stripping voltammetry of Pb (II) using polyaniline modified pencil lead electrode

Date

5-2002

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Norriel S Nipales

Co-adviser

Hidelisa P Hernandez

Committee Member

Aurea N. Miranda-Chu

Abstract

An electrochemical cell used in microscale voltammetric analysis was constructed. A 50 mm x 25 mm x 5 mm piece of a rectangular fiberglass was used in the construction of the fabricated microcell. An FITC 5 Speed Drill Press was used to bore a 3 mm hole for the working electrode, a 2 mm hole for the auxiliary electrode and a center hole with 3.5 mm depth on the center to provide a slot for the Ag/AgCI reference electrode. A polyaniline modified pencil lead electrode (PMPLE) that fit in the fabricated microcell was constructed and was used as the working electrode. The constructed working electrode has 1 mm exposed pencil lead electrochemically coated with polyaniline. The performance of the fabricated microcell was compared to a 15-mL cell using cyclic voltammetry (CV) and differential pulse anodic stripping voltammetry (DPASV). CV performed on the fabricated microcell showed a wider potential window (ranges from -1000 mV to 100 mV) than the 15-mL cell (ranges from -1000 mV to -250 mV). Higher peak currents were obtained using the 15-ml, cell compared to the fabricated microcell in the CV of 0.1 M HCI blank electrolyte at a scan rate of 100 mV/s. DPASV of varying Pb (II) concentration (50 ppm, 100 ppm, 500 ppm, and 1000 ppm) performed using the 15- mL cell and the fabricated microcell gave almost the same peak current values.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2002 C4 L57

Document Type

Thesis

This document is currently not available here.

Share

COinS