Determination of Hg (ll) in tributary rivers of Laguna de Bay by voltammetric method using Papaya Latex-Modified Carbon Paste Electrode (PalaMCPE)

Date

4-2002

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Maxima E. Flavier

Co-adviser

Evamarie P Capareda

Abstract

The voltammetric study of Papaya latex-modified carbon paste electrode PaIaMCPE was investigated for its application in the electrochemical analysis of mercury (II) present in tributary rivers of Laguna de Bay. Electrochemical characteristics of PaIaMCPE using cyclic voltammetry showed a potential window from —1000 mV to *1000 mV. The optimum conditions for differential pulse adsorptive stripping voltammetry (DPAdSV) analysis using PaIaMCPIi was the use of 0.1 M acetate buffer of pH 4.0 for accumulating solution. 0.1 M NH.,CI as the supporting electrolyte solution, and 0.1 M EDTA as the regenerating solution. The regeneration of the electrode surface required two hours of immersion in 0.1 M EDTA solution. The calculated limit of detection (1.0D) and limit of quantification (LOQ) for DPAdSV using PaIaMCPE were 0.75 ppm and 2.50 ppm, respectively. However, the use of PalaMCPE for the analysis of fresh water samples using DPAdSV was not very successful. The small amount of Hg (II) in the sample were masked by interfering organic matter. Cold-vapor atomic absorption spectrophotometry (AAS) showed 0.01 to 0.05 ppm concentration of Hg (II), which is below the LOD for DPAdSV using PaIaMCPE.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2002 C4 G37

Document Type

Thesis

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