(93f) Electrochemical Sensor Sytem for Trace Silicic Acid Analysis
- Conference: AIChE Spring Meeting and Global Congress on Process Safety
- Year: 2009
- Proceeding: 2009 Spring Meeting & 5th Global Congress on Process Safety
- Group: Environmental Division
- Time: Wednesday, April 29, 2009 - 10:35am-11:00am
A highly sensitive voltammetric detection of silicic acid (SA), the main chemical species of dissolved silica in sea water, is described. The protocol relies on a fast square-wave voltammetric measurement of the decreased molybdenum stripping signal due to the formation of silicomolybdate complex. The cathodic stripping experiments were performed at the mercury film electrodes using HCl-KCl (pH 1.6) buffer solution. Different ligands, pH, ligand concentration, deposition potential and accumulation time were evaluated. Under the optimal conditions, a linear response is observed over the 50 - 400 µg/L SA concentration range with a detection limit of 2 µg/L. A highly stable response, with a relative standard deviation (RSD) of 4.8%, is observed for 10 repetitive measurements. Such electrochemical approach offers great promise for a simple, rapid, sensitive on-site or in situ real-time detection of SA.
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