Distribution Characteristics of Phosphorus in Water Samples from Xiaonanhai Lake in Qianjiang District,Chongqing

The author aims to examine phosphorus species distribution in surface water of Xiaonanhai Lake.Water samples were collected from eight sampling points.Then samples were tested to determine the phosphorus contentes.Finally,and the association between phosphorus level and water quality parameters was established to examine the correlation.The results indicate water samples level of TP,DTP and DP registered as 0.017~0.029 mg/L,0.010~0.022mg/L and 0.006~0.010 mg/L respectively,the dissolved total phosphorus(DTP)proved to be dominant form in total phosphorus(TP),while the dissolved orthophosphate(DP)was the major existing form in DTP.The concentrations of TP were relatively high in No.1,No.3and No.6sampling points,which might due to the reason that water quality were impacted greatly by surroundings areas.The significant correlation was found between PP and dissolved oxygen(DO)and conductivity of the lake water,also was found between the contents of DP and pH,but no significant correlation exist between other phosphorus species and pH,dissolved oxygen(DO)and conductivity either.The content of TP of drinking-water point of Qianjiang city has varied greately each month.In a large,concentration of TP shows an increasing trend.