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Total hardness is an important index to evaluate drinking water quality. Total hardness in drinking water was determined by micro titration and conventional titration seperately and parallel determination results of microscale chemical laboratory and constants experiment were compared. The results of micro titration were accurate and reliable. Microscale laboratory has such characteristics as obvious phenomena, saving reagents, fast analysis. So the cost was reduced and the innovative ability of students was improved by full compliance with the concept of green chemistry. Microscale laboratory is worth promoting.

Total hardness is one of important index to evaluate drinking water quality. The determination method of total hardness in the drinking water using the micro titration has introduced, and also has compared the obtaining results by the microburette and by the routine analysis. The relative standard deviation is far less than 2.0%. There is no obvious difference in the results. F examination and t examination are all in the appropriate scope.