潮白河-京津新城段水系的水质研究

Analysis on Water Quality in Aquatic System of Chaobai River-Beijing and Tianjin New Town

2018年调查结果显示,在潮白河-京津新城段水系5个监测面中,水体理化指标BOD 5和COD cr均超过国家Ⅳ类水标准,甚至达到Ⅴ类水标准;TN、TP含量均接近或超过Ⅴ类水标准;下游水系的高锰酸盐和氨氮指数分别高于Ⅳ类、Ⅴ类水标准,无重金属污染,水体主要为有机物污染。该水系3项理化指标(TN、TP、COD cr)的TLI值为60.29~67.50,属于中度富营养型水体。浮游植物平均密度为1.96×10^5 cells/L,TN、TP含量降低率分别为68.16%,25%。

The research in 2018 indicated that the physicochemical indexes BOD 5 and COD cr were found to exceed national class IV water standard,and even reach national class V in the 5 monitoring sections of Chaobai River and Jing-jin New Town aquatic system in Tianjin.The concentrations of TN and TP in the water were both close to or over national class V water standard;the indexes of potassium permanganate and ammonia nitrogen were also respectively higher than national water standard of class IV and class V in the downstream water system,and there was no heavy metal pollution.It showed that this water body was mainly organic pollution.The TLI values of the three physicochemical indexes in this aquatic system(TN,TP,COD cr)were 60.29-67.50,which revealed that the tested water was medium eutrophic water body.The average cell density of phytoplankton was 1.96×10^5 cells/L,and the concentrations of TN and TP decreased by 68.16%and 25%,respectively.