DETERMINATION OF AMMONIA IN WATER AND INDUSTRIAL EFFLUENT STREAMS WITH THE INDOPHENOL BLUE METHOD USING SEQUENTIAL INJECTION-ANALYSIS

A suitable sequential injection analysis (SIA) analyser to monitor wat er quality in terms of the ammonia content in water and industrial eff luent streams was developed. The system is fully computerised and is a ble to monitor ammonia in samples at a frequency of ca. 16 samples per hour with a relative standard deviation better than 1.8%. The calibra tion curve is linear between 0 and 50 mg l(-1) which falls within the required analyte range. The levels of possible interferents in the wat er and industrial effluent streams were negligible to cause any interf erence on the proposed system.