Research on Water Environment Chemical Characteristics in the Middle and Lower Reaches of Shiyang River Basin

The article is based on selection of the middle and lower reaches of Shiyan River Basin as the studied object. It compared to those data over a year of 3 monitoring stations and analyzes the water environment chemical characteristics this area and evaluates the water quality. The result shows that the water quality of Shiyang River is high content of HCO3-、SO42-and Ca2 +. The water quality belong to more alkalescence middle mineralized water,its mineralization is increased by the HCO3-adding. The Ph value,total hardness,mineralization and main ions of the water in the downstream river are reaching GB5749- 2006 Drinking water health standards or GB3838- 2002 Water quality standard of surface water environment quality standard classⅣ,the water quality is good,but the water in the middle area do not meet the above standard.