Realization of a prototype industrial on-line sensing system for ammonium based on micro system technology: results and future perspectives

A prototype sensing-system for ammonia in water matrices has been designed and tested. The sensor is based on colorimetric detection (the indophenol blue reaction). It has been designed keeping in mind the features and performance parameters important for on-line sensing in industrial environments, such as effective sample pre-filtering, auto-calibration, low reagent consumption and short response time.