天津海河磷的分布特征

采集海河干流重要断面、相应排污渠以及部分支流(北运河、子牙河、南运河)共29个监测断面的水样,对样品中的溶解性活性磷(SRP)、总溶解态磷(TDP)与总磷(TP)进行测定,并分析其分布特征。结果显示:海河干流各断面的TP质量浓度为0.4~3.5mg/L,已超出GB3838—2002《地表水环境质量标准》Ⅴ类水质标准,SRP质量浓度0.09~0.75 mg/L,TDP质量浓度0.24~1.42 mg/L;各排污渠(支流)TP质量浓度0.2~5.0 mg/L,SRP质量浓度0.01~3.63 mg/L,TDP质量浓度0.12~4.16 mg/L。排污渠(支流)多数断面的含磷量比相应干流的高。天津海河总磷以总溶解态磷为主要形态,这和海河悬浮颗粒物浓度较低有关。

Phosphorus distribution in Haihe River of Tianjin City

The monitoring results and distribution characteristics of orthophosphate, total dissolved phosphorus （TDP） and total phosphorus （TP） in 29 water samples taken from the mainstream of the Haihe River and some tributaries （the Beiyunhe River, the Ziyahe River and the Nanyunhe River） show that TP in the main stream of the Haihe River ranges from 0.4 to 3.5 mg/L, thus failing to meet the grade V standard of Environmental quality standards for surface water （GB3838-2002）. The concentrations of orthophosphate and TDP in the mainstream are, respectively, 0.09 - 0.75 mg/L and 0.24 - 1.42 mg/L. The concentrations of TP, orthophosphate and TDP in the tributaries are, respectively, 0.2 - 5.0 mg/L, 0.01 - 3.63 mg/L and 0.12 - 4.16 mg/L. The content of phosphoms at most cross sections of the tributaries is higher than that in mainstream. TDP is the dominant part of TP due to the low concentration of suspended sediments in the Haihe River in Tianjin City.