黔江区小南海湖水中磷形态分布特征

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

为详细了解小南海表层湖水中磷形态的分布特征,选取8个点位监测湖水中不同形态磷的含量,分析了磷形态含量与水质参数之间的相关性。研究结果表明:TP、DTP和DP的质量浓度范围分别为0.017～0.029、0.010～0.022、0.006～0.010mg/L。湖水中的TP以溶解态磷(DTP)为主要存在形态,DTP主要以DP为主要形态存在。1、3和6号采样点TP浓度相对较高,表明该区域磷形态受周围环境的影响较大。相关分析结果表明,湖水中磷形态PP含量和DO和电导率呈极显著相关,DP含量和pH呈极显著正相关,其余形态与pH、DO和电导率无明显相关性;黔江城区饮用水取水点TP含量随月份变化幅度较大,初步判断TP浓度变化呈增长趋势。

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. 022 mg/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. 3 and No. 6 sampling points, which might due to the reason that water quality were impacted greatly by surroundings areas. The significant correlation was found be- tween 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.