期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 98, 期 1, 页码 12-17出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2003.08.004
关键词
ammonia detection; Berthelot's reaction; optical sensor; colorimetric method; solid-state ammonia sensor; disposable sensor; water monitoring
A non-reversible solid-state ammonia sensor based on formation of indophenol blue has been developed. A new optimised reaction conditions found for Berthelot's reaction allow the sensor to respond to dissolved ammonia in ambient conditions at a much faster reaction rate than previously known. This solid-state colorimetric sensor reaches maximum colour intensity in similar to3 min at room temperature (similar to20 degreesC) and responds linearly to ammonia between 1 and 10ppm. A semi-automatic imaging system that consists of a black and white digital camera illuminated by red, green and blue LEDs was developed to measure the sensor responses. (C) 2003 Elsevier B.V. All rights reserved.
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