Abstract
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%.
Original language | English (US) |
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Pages (from-to) | 870-873 |
Number of pages | 4 |
Journal | Electroanalysis |
Volume | 16 |
Issue number | 10 |
DOIs | |
State | Published - May 2004 |
Externally published | Yes |
Keywords
- Mesoporous silica
- Modified electrode
- Sensor
- Uranium
ASJC Scopus subject areas
- Analytical Chemistry
- Electrochemistry