Carbon Paste Electrode Modified with Carbamoylphosphonic Acid Functionalized Mesoporous Silica: A New Mercury‐Free Sensor for Uranium Detection
2004; Wiley; Volume: 16; Issue: 10 Linguagem: Inglês
10.1002/elan.200302868
ISSN1521-4109
AutoresWassana Yantasee, Yuehe Lin, Glen E. Fryxell, Zhe-Ming Wang,
Tópico(s)Advanced Chemical Sensor Technologies
ResumoAbstract This study reports a new approach for developing a uranium electrochemical sensor that is mercury‐free, solid‐state, and has less chance for ligand depletion than existing sensors. A carbon‐paste electrode modified with carbamoylphosphonic acid self‐assembled monolayer on mesoporous silica was developed for uranium detection based on an adsorptive square‐wave stripping votammetry technique. Voltammetric responses for uranium detection are reported as a function of pH, preconcentration time, and aqueous phase uranium concentration. The uranium detection limit is 25 ppb after 5 minutes preconcentration and improved to 1 ppb after 20 minutes preconcentration. The relative standard deviations are normally less than 5%.
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