长江干流近岸沉积物重金属的空间分布及风险评估

发布时间：2018-04-15 19:15

  本文选题：长江干流 + 沉积物　； 参考：《环境科学学报》2017年11期

【摘要】：采集长江干流上、中、下游人口分布密集的主要城市江段、三峡库区等19个监测断面的近岸沉积物样品,分别分析了枯水期和丰水期沉积物样品中砷、汞、铜、铅、镉、锌和锰等重金属含量在长江干流上的分布特征.结果表明,枯水期,砷和铅在三峡库区寸滩断面含量最大,铜和汞在入江口含量最大.丰水期,长江干流最上游的两个监测断面汞、砷、铜、铅4种重金属含量均较低;三峡库区砷、铜、铅3种重金属总量均较大,汞含量也较高.依据相平衡分配法和沉积物污染指数法(SPI),选取铜和铅两项参数,对长江干流近岸沉积物质量进行风险评估,结果显示,长江干流19个监测断面近岸沉积物等级均为Ⅰ类,但入江口沉积物污染指数(SPI)值最大.
[Abstract]:The samples of inshore sediments from 19 monitoring sections of the Yangtze River, the main cities with dense population distribution in the middle and lower reaches of the Yangtze River and the three Gorges Reservoir area, were collected. The samples of arsenic, mercury, copper, lead and cadmium in the sediments during the dry and high water periods were analyzed, respectively.The distribution characteristics of heavy metals such as zinc and manganese in the main stream of the Yangtze River.The results show that the content of arsenic and lead in the section of the three Gorges Reservoir area is the highest, and that of copper and mercury is the highest in the estuary of the Yangtze River during the dry season.In the high water season, the mercury, arsenic, copper and lead contents in the two monitoring sections of the upper reaches of the main stream of the Yangtze River are all relatively low, and the total contents of arsenic, copper and lead in the three Gorges Reservoir area are all large, and the mercury content is also relatively high.According to the method of phase equilibrium distribution and the method of sediment pollution index (SPI), two parameters, copper and lead, are selected to assess the risk of sediment quality in the Yangtze River. The results show that the grades of the nearshore sediments in 19 monitoring sections of the Yangtze River are all classified as class 鈪，

本文编号：1755422