Voltammetric analysis of cadmium (ll) in laboratory waste using coconut coir modified carbon paste electrode (CocoCPE)

Date

3-2001

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Norriel S Nipales

Co-adviser

Norma N. Fajardo

Abstract

The novel coconut coir-modified carbon paste electrode (CocoCPE) was studied for its application in the voltammetric analysis of cadmium in laboratory waste. Preliminary investigation demonstrated the ability of the CocoCPE to accumulate cadmium (II) ions on its surface and generated peaks near the —800 mV range. Experimental parameters for the analysis were determined Using acetate buffer of pH 5.0 as accumulating solution and 0.1M NaCI as stripping solution, the proposed method gave a limit of detection of 0.46 ppm and a sensitivity of 4.28 nA/ppm. Studies on the regenerative ability of the electrode showed that it could be effectively regenerated when soaked in 1M F12504 overnight. Analysis of a laboratory waste through differential pulse anodic stripping voltammetry (DPASV) gave a cadmium (II) concentration equal to 1.4 ppm A parallel analysis of the laboratory waste on atomic absorption spectrometry (AAS) gave a cadmium (II) concentration of 4.1 ppm. Statistical analysis (t-test, 95% confidence level) revealed that the cadmium (11) concentrations obtained from the two methods were significantly different. This can be attributed to the fact that AAS determines total cadmium content while DPASV determines cadmium (11) only. Also, the laboratory waste contained several heavy metals which probably competed with the cadmium peak.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2001 C4 G53

Document Type

Thesis

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