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Analysis and Research on Drinking Water Hardness in Main Zone of Dingxi City

ZHAO Ming(Department of Biology and Chemistry,Dingxi Teachers College,Dingxi Gansu 743000)  
Water hardness is an important index to indicate water quality.Total quality of calcium salts and Magnesium Salts are e-quivalent to 10mgCaO,namely 1°.Under 8° is softon water,8-16° is intermediate water,over 16° is hard water,more than 16° is ex-tremely hard water.Water Hardness breaks into,the sum of them namely total hardness of water.This work measure and analysis res-ident drinking water hardness in main zone of Dingxi city main using EDTA titrate method.Through measuring,total hardness of wa-ter this zone is 10.40°,permanent hardness is 7.00°,impermanent hardness is 3.40°.According to standard of water hardness,resident drinking water hardness in main zone of Dingxi city is intermediate water.
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