Research on Accumulation of Cu,Pb,Cd,Zn in Different Submerged Plants

In order to study the difference between different types of submerged plants accumulation on Cu, Pb, Cd, Zn in the water, Potamogeton crispus, Hydrilla verticillata, Myriophyllum verticillatum, Vallisneria Natans and Potamogeton maackianus, several major submerged plants which are grown in Guangxi Diaojiang river were analyzed, the results showed that: At different sampling points or different sampling period, the content of Cu, Pb, Cd, Zn in the same submerged plants are different. In the all measured elements, the variation of content of Zn is the biggest; the maximum value of Zn content is 581 times higher than the minimum value. The results showed that the submerged plants can well reflect the environmental changes, but the response of different submerged plant to the environment is different. The concentrating ability of Cu、Cd、 Zn heavy metal elements of Potamogeton crispus, Hydrilla verticillata, Myriophyllum verticillatum, Vallisneria Natans and Potamogeton maackianus: Potamogeton crispus Hydrilla verticillata Myriophyllum verticillatum Vallisneria Natans Potamogeton maackianus. In all measured submerged plants, the Potamogeton maackianus's concentrating ability of Pb is the strongest. As a result, using submerged plants to indicate or remediate water environment must be based on different elements and chose the right submerged plants.