ISSN:
1573-4994
Keywords:
Lipophilic indicator
;
optical ammonia sensing
;
fluorescent particles
;
inner filter effect
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract A new indicator-immobilization technique for the development of a sensor material for monitoring ammonia gas in aqueous solutions in presented. It is based on the change in absorbance intensity of a lipophilized pH indicator homogeneously dissolved in silicone rubber. Exposure to ammonia leads to a deprotonation of the indicator and this increases the absorbance of the base form of the indicator bromophenol blue. The sensor responds over a 17 μg/L to 17 mg/L concentration range, with a detection limit of 12 μg/L.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01876651
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