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首页> 外文期刊>International journal of environmental analytical chemistry >The mesocosm study of cadmium and copper bioaccumulation by water hyacinth in one-time and sequentially contaminated system
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The mesocosm study of cadmium and copper bioaccumulation by water hyacinth in one-time and sequentially contaminated system

机译：水葫芦对一次和顺序污染系统中镉和铜的生物累积的中观研究

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摘要

The results of investigation of cadmium and copper accumulation by water hyacinth, depending on the conditions of exposure, are discussed. The main specialty of the study consists in the use of mesocosm approach that allows estimating consequences of pollutant effect on ecosystem in conditions as close to natural as possible. It includes the use of mesocosms - polyethylene capacities installed directly into studied water reservoir. This approach provides data that allow describing the course of studied processes in nature due to taking into consideration a climatic factor as well as buffer capacity of the real system to pollutants in its current state. Test substances were introduced in mesocosms followed by the study of their elimination dynamics and accumulation in plants. It was shown that the degree of cadmium and copper removal by water hyacinth is 74-92% and 88-91%, respectively, and it depends on the way of pollutant introducing into the reservoir. Uptake by plankton and sedimentation do not contribute significantly in this process. It was found that cadmium does not affect the accumulation of copper, whereas the presence of copper inhibits removal of cadmium in case of sequential addition. Nevertheless for both the elements, the values of bioconcentration factor (BCF) are high enough: BCFCu=3500 +/- 200 and BCFCd=2600 +/- 150, which indicates a high ability of the plant to accumulate these elements. About 9% of Cd migrates to the stems and leaves of water hyacinth in the process of bioaccumulation, while more than 97% of copper concentrates in the roots.
机译：讨论了水葫芦对镉和铜积累的调查结果，具体取决于暴露条件。该研究的主要专长在于使用中观方法，该方法允许在尽可能接近自然的条件下估算污染物对生态系统的影响。它包括mesocosms的使用-将聚乙烯容量直接安装到研究的水库中。由于考虑了气候因素以及实际系统对当前状态下污染物的缓冲能力，因此该方法提供的数据可以描述自然界中所研究过程的过程。将测试物质引入中膜，然后研究其在植物中的消除动力学和积累。结果表明，风信子对镉和铜的去除率分别为74-92％和88-91％，这取决于污染物引入水库的方式。浮游生物的吸收和沉积在该过程中没有显着贡献。发现镉不影响铜的积累，而在顺序添加的情况下铜的存在抑制了镉的去除。尽管如此，对于这两种元素，生物富集因子（BCF）的值都足够高：BCFCu = 3500 +/- 200和BCFCd = 2600 +/- 150，这表明植物具有很高的积累这些元素的能力。在生物富集过程中，约9％的Cd迁移至凤眼兰的茎和叶，而根中的铜富集率超过97％。

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