长江流域宜宾市境内2021年地表水水质质量调查与评价

Investigation and Evaluation of Surface Water Quality in Yibin of Yangtze Valley in 2021

通过2021年宜宾市境内37个地表水监测断面水质分析结果的调查统计,分析评价了长江流域宜宾市境内的水质情况。结果显示,长江流域宜宾市境内Ⅰ~Ⅲ类水质比例100%,总体水质为优,粪大肠菌群超标现象消失。长江流域宜宾市境内水质优越排序为:金沙江河流>长江水系>岷江河流;干流水质>支流水质,支流上游段水质>支流中下游段水质,支流偶有超标现象,超标指标为石油类、溶解氧和总磷;部分小支流水质有变差的趋势。

The water quality situation in Yibin of Yangtze valley was analyzed and evaluated,based on the investigation and statistics of water quality analysis results of 37 surface water monitoring sections in Yibin,2021.The results showed that the water quality of classⅠ~Ⅲwas 100%,the overall water quality was excellent,and the fecal coliforms disappeared.The superior water quality of Yibin in the Yangtze valley was in the order of Jinshajiang River>Yangtze River>Minjiang River,the water quality of the main stream was better than that of the tributaries,and the water quality of the upper reaches of the tributaries was better than that of the middle and lower reaches of the tributaries.Water quality of some small tributaries tended to deteriorate.