Abstract: A system based on weighing titration method was developed for total hardness, chlorine, total alkalinity and chemical oxygen demand (COD) determination in drinking water. The system is feasible, sensitive, precise, accurate and practical. The detection limit is between 0.05 mg/L and 10.0 mg/L, the relative standard deviation (RSD) of three levels is 0.5%~3.1%, and the detection system is faster than the conventional determination method of national standard for the same sample amount at least 1 day. The characteristic parameters of these methods are met other analytical methods, and the results are in good agreement with the data obtained by the standard measurement method with the relative deviation of 0.5%～4.8%.

Key words: Weighing titration, Drinking water, Rapid detection system