By the changes of chlorophyll content, the lethal concentration of Hg to Egeria najas was 0.10-2.00mg/L.

• 处理48h以后，Hg~(2+)浓度人于1.；00mg/L实验组中的叶片褪绿严重而且叶片相互粘连，叶片叶绿素含量明显低于对照组，从中可以粗略看出Hg(2-)对细叶蜈蚣草的致死浓度为0