沉水植物对水体铅、铬重金属污染的清除作用研究.doc

摘要：本实验通过在室内利用施加重金属离子溶液水培养沉水植物金鱼藻研究沉水植物在不同状况下对重金属离子的吸收清除作用。实验分别设置不同培养天数(间隔1、3、6天)和不同重金属浓度(3mg/L和30mg/L)实验组(同时设置对照与3组平行)，利用火焰原子吸收光谱法测定水和藻类中的重金属Cr﹑Pb的含量。结果表明：随着天数的增长，水中的重金属Cr﹑Pb含量逐渐下降，而沉水植物金鱼藻中的重金属Cr﹑Pb含量逐渐上升；同时水中的重金属Cr﹑Pb含量浓度越高，则金鱼藻对重金属Cr﹑Pb的吸收收能力越高。在时间天数为15d,重金属浓度为3mg/L的条件下，水中Cr的浓度从7.123mg/L降到了2.289mg/L,下降了4.834mg/L;同等条件下，金鱼藻中Cr的浓度从0.109mg/L上升到了5.86mg/L,上升了5.751mg/L。结论：金鱼藻具有较好的吸收重金属离子作用，可作为清除水体重金属离子污染植物选用。

关键词：沉水植物; 金鱼藻; 重金属; 火焰原子吸收光谱法; 吸收作用

Key Words: In this study, through the submerged plant Ceratophyllum demersum submerged plants scavenging effect on the absorption of heavy metal ions under different conditions imposed in the indoor use of heavy metal ion solution of water culture. The experiments were set up in different culture days (intervals of 1, 3, 6 days) and different concentrations of heavy metals (3mg / L and 30 mg / L), the experimental group (set both the control and 3-group parallel).I studied heavy metals Cr, Pb content in water and algae by flame atomic absorption spectrometry. The results showed that: As the days grew ,the heavy metals Cr ,Pb in water dropped gradually as well as heavy metals Cr ,Pb  in the submerged macrophyte Ceratophyllum demersum increased gradually . And I also found that the higher heavy metals Cr, Pb content in water ,the lower the hornworts’ absorption of heavy metals Cr. Cr in water dropped from 7.123mg / L to 2.289mg / L,4.834mg / L reduction under the background that it’s in time of 15 days and the concentration  3mg / L in case ;and Cr content in hornworts increased from  0.109mg / L rose to 5.86mg / L, 5.751mg / L rise under the same conditions . Conclusion: Ceratophyllum demersum has better absorption of heavy metal ions can be used as clear water heavy metal ion contamination of plant selection.

Abstract:submerged plant; horworts; heavy metal; flame atomic absorption spectrometry;