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Anodic Stripping Voltammetric Determination of Mercury (II) using Lectin-modified Carbon Paste Electrode

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Author(s): Elmer-Rico E. Mojica | Florinia E. Merca

Journal: Journal of Applied Sciences
ISSN 1812-5654

Volume: 5;
Issue: 8;
Start page: 1461;
Date: 2005;
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Keywords: Carbon paste elecrotde | stripping voltammetry | lectin mercury modifier

ABSTRACT
A Carbon Paste Electrode (CPE) was fabricated using lectin isolated from black sea cucumber (Holothuria scabra Jaeger). The prepared electrode was found to have high affinity towards mercury (II) ions. Analysis of mercury (II) was conducted by Differential Pulse Adsorptive Stripping Voltammetry (DPAdSV) using 0.1 M NaOH as supporting electrolyte. The following conditions gave the best results; pH 7, 20% modifier composition, 240 sec accumulation time and 300 sec deposition time. Electrode regeneration was successfully done by soaking the electrode for at least 5 min in 0.01 M EDTA solution. A linear relationship was observed at the range of 0.1 to 5 mg L -1 with a correlation coefficient of 0.9821. The limit of detection was calculated as 0.0474 mg L -1. Analysis for mercury content in a laboratory waste sample using the lectin modified electrode gave comparable result as that of AAS method.
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