Detection of Water Eutrophication in Hengshui Region

Abstract

The content of total nitrogen and total phosphorus of surface water in three places of Hengshui region were determined by potassium persulfate oxidation-UV spectrophotometry and ammonium molybdate spectrophotometric method, respectively. The samples were treated with alkaline potassium persulfate so that organic nitrogen contained in water could be converted into nitrate. The absorbance was measured at 220 nm and 275nm on UV spectrophotometer, The standard curve was drawn and the total nitrogen content in the samples were measured. The samples were treated with concentrated nitric acid and perchloric acid so that the phosphorus contained in water could be converted into orthophosphate. The absorbance was measured at 700nm with 722S spectrophotometer. The standard curve was drawn and the total phosphorus content in the samples were measured. The results showed that the surface water in Hengshui region such as garden, river and lake were all considerable eutrophication.