Fibre-optic fluorescing sensor for ammonia

✍ Scribed by Otto S. Wolfbeis; Hermann E. Posch

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 504 KB
• Volume: 185
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(86)80060-5

✦ Synopsis

The fluorescing sensor is based on the change in fluorescence intensity of a buffered pH indicator solution entrapped in silicone rubber. Exposure to ammonia increases the pH of the trapped solution; this increases the fluorescence intensity, which is monitored via an optical fibre bundle. Ammonium chloride in 0.001 M sodium hydroxide, or the indicators themselves, can serve as buffers. Effects of sensor preparation and buffer composition on response time, reversibility and sensitivity are discussed.