Optical rubbery ormosils sensor for the detection of ammonia
- 化学化工－已发表论文 
Rubbery ormosil films with immobilized aminofluorescein (AF) were investigated to develop an optochemical sensor for the determination of ammonia in water. The get precursors with tetramethoxyilane (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 mug mL(-1) (S/N 2). the response being linearly dependent on concentration in the range of 0.5 to 80 mug 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.