Heavy metals in plants and phytoremediation.

Type:
artikel
Titel:
Heavy metals in plants and phytoremediation.
Auteur:
Cheng, Shuiping
Taal:
Engels
Uitgever:
S.l. : s.n., n.d
Nota:
Umweltwissenschaften und Schadstoff-Forschung. vol. 2003(10), 5. p. 335-340
Plaatsnummer:
Onderwerp:
Afvalwater
Plantenfysiologie
Zware metalen
Samenvatting:
Samenvatting:Goal, Scope and Background. In some cases, soil, water and food areheavily polluted by heavy metals in China. To use plants to remediateheavy metal pollution would be an effective technique in pollutioncontrol. The accumulation of heavy metals in plants and the role ofplants in removing pollutants should be understood in order to implementphytoremediation, which makes use of plants to extract, transfer andstabilize heavy metals from soil and water.Methods. The information has been compiled from Chinese publicationsstemming mostly from the last decade, to show the research results onheavy metals in plants and the role of plants in controlling heavy metalpollution, and to provide a general outlook of phytoremediation in China.Related references from scientific journals and university journals aresearched and summarized in sections concerning the accumulation of heavymetals in plants, plants for heavy metal purification andphytoremediation techniques.Results and Discussion. Plants can take up heavy metals by their roots,or even via their stems and leaves, and accumulate them in their organs.Plants take up elements selectively. Accumulation and distribution ofheavy metals in the plant depends on the plant species, element species,chemical and bioavailiability, redox, pH, cation exchange capacity,dissolved oxygen, temperature and secretion of roots.Plants are employed in the decontamination of heavy metals from pollutedwater and have demonstrated high performances in treating mineral tailingwater and industrial effluents. The purification capacity of heavy metalsby plants are affected by several factors, such as the concentration ofthe heavy metals, species of elements, plant species, exposure duration,temperature and pH.Conclusions. Phytoremediation, which makes use of vegetation to remove,detoxify, or stabilize persistent pollutants, is a green andenvironmentally-friendly tool for cleaning polluted soil and water. Theadvantage of high biomass productive
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