Hasan S H, Talat M, Rai S
Water Pollution Research Laboratory, Department of Applied Chemistry, Institute of Technology, Banaras Hindu University, Varanasi 221 005, India.
Bioresour Technol. 2007 Mar;98(4):918-28. doi: 10.1016/j.biortech.2006.02.042. Epub 2006 May 5.
The water hyacinth (Eichchornia crassipes) has been successfully utilized for the removal of Zn(II) and Cd(II) as well as their admixture from samples of aqueous solutions. The growth of the plant after 16 days of exposure to the metal ions showed an increasing trend up to 2.5 ppm of Cd(II) and 6.0 ppm of Zn(II) concentrations, however, the growth became nondetectable or inhibited above these concentrations. The overall metal uptake by the plant was dependent upon the concentration of the metal and the duration of the exposure time. The metal uptake from a mixture of Cd(II) and Zn(II) was reflected by a rate constant quite different from those solutions containing only one metal ion. An analysis of metal in roots and tops of the plants showed that more Zn(II) was accumulated in the root when compared to Cd(II). However, the accumulation factor for the tops and the roots for Cd(II) and Zn(II) was higher than those obtained admixture of Zn(II) and Cd(II). The rate of metal mobility in the root was slower than that in the top of the plant for Zn(II) and Cd(II). A water hyacinth based system can be used to remove Cd(II) and Zn(II) from water/wastewater.
凤眼莲（Eichchornia crassipes）已成功用于从水溶液样品中去除锌（II）和镉（II）及其混合物。在暴露于金属离子16天后，植物的生长在镉（II）浓度达到2.5 ppm和锌（II）浓度达到6.0 ppm之前呈上升趋势，然而，在这些浓度以上生长变得无法检测到或受到抑制。植物对金属的总体吸收取决于金属的浓度和暴露时间的长短。从镉（II）和锌（II）混合物中吸收金属的速率常数与仅含一种金属离子的溶液的速率常数截然不同。对植物根部和顶部的金属分析表明，与镉（II）相比，根部积累的锌（II）更多。然而，镉（II）和锌（II）在顶部和根部的积累因子高于锌（II）和镉（II）混合物的积累因子。对于锌（II）和镉（II），金属在根部的迁移速率比在植物顶部的迁移速率慢。基于凤眼莲的系统可用于从水/废水中去除镉（II）和锌（II）。
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