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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
J. Reichert, W. Sellien, and H. J. Ache (1991)Sensors Actuators A 25–27, 481–482.
G. Gauglitz and G. Kraus (1993)Fresenius J. Anal. Chem. 346, 572–576.
G. Gagor and D. R. Walt (1991)Anal. Chem. 63, 793–797.
H. He, H. Li, G. Mohr, B. Kovács, T. Werner, and O. S. Wolfbeis (1993)Anat. Chem. 65, 123–127.
O. S. Wolfbeis (Ed.) (1991) inFiber Optic Chemical Sensors and Biosensors, Vol. 2, CRC Press, Boca Raton, Florida, p. 65 ff.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Werner, T., Klimant, I. & Wolfbeis, O.S. Optical sensor for ammonia based on the inner filter effect of fluorescence. J Fluoresc 4, 41–44 (1994). https://doi.org/10.1007/BF01876651
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01876651