长江是我国最大的河流,流域面积为180万平方公里,年入海流量约为9600亿立方米。长江流域的人口大约占全国总人口的三分之一。重庆以下的长江中下游沿岸更是人口密集区。江水水体是沿岸各大、中、小城市的主要水源地,水体水质的好坏悠关国计民生。水体中铜的含量是水体水质的一 The Yangtze River is China’s largest river, with a catchment area of ​​1.8 million square kilometers and an annual flow into the sea of ​​about 960 billion cubic meters. The population of the Yangtze River basin accounts for about one third of the country’s total population. The lower reaches of the Yangtze River in Chongqing are more densely populated areas. River water body is a major source of water in major, medium and small cities along the coast, water quality is good or bad about the people’s livelihood. The water content of copper is one of the water quality