Optical rubbery ormosils sensor for the detection of ammonia |
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| Authors: | X Chen Y Dai Z Li Z Zhang X Wang |
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| Institution: | (1) The Key Laboratory of Analytical Sciences of MOE and Department of Chemistry, Xiamen University, Xiamen 361005, China e-mail: xichen@xmu.edu.cn, CN |
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| Abstract: | Rubbery ormosil films with immobilized aminofluorescein (AF) were investigated to develop an optochemical sensor for the
determination of ammonia in water. The gel precursors with tetramethoxysilane (TMOS) and dimethyldimethoxysilane (DiMeDMOS)
were deposited on glass supports, and characterized in terms of response to pH, and to dissolved ammonia at constant pH. After
preconditioning the sensing film was stable for 6 months. The detection limit for ammonia in water was 0.2 μg mL–1 (S/N 2), the response being linearly dependent on concentration in the range of 0.5 to 80 μg mL–1 ammonia. The response time was less than 5 min. The effects of sodium chloride concentration, temperature, and coexisting
metal ions and compounds were investigated.
Received: 22 December 2000 / Revised: 5 March 2001 / Accepted: 7 March 2001 |
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