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01.Phytoremediation of Heavy Metals using Poplars (Populus spp): A Glimpse of the Plant Responses to Copper, Cadmium and Zinc Stress pp. 387-414
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Eco-Environmental Consequences Associated with Chelant-Assisted Phytoremediation of Metal-Contaminated Soil pp. 709-722 $100.00
Authors:  (Ismail M.M. Rahman, M. Mosharraf Hossain, Zinnat A. Begum, M. Azizur Rahman, Hiroshi Hasegawa, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Japan, and others)
Abstract:
Phytoremediation utilizes different plant species as a media of containment, destruction, or extraction of contaminants from different matrices including soil and water. Plants require essential metals i.e. Cu, Mn, Fe, Zn, Mo, etc. for growth and as such they are capable of accumulating these metals. Plants can also accumulate Cd, Cr, Pb, Co, Ag, Se, Hg, etc., which are apparently non-essential for their growth and survival. This metal-accumulating property of plants has made them very popular in recent days in the remediation of metal-contaminated soil. This approach of remediation has the benefit of cost savings compared to the conventional treatment options. Plants capable of concentrating metal pollutants at enhanced rate - the hyperaccumulators - are commonly used for metal-polluted soil remediation. But, the bioavailability of the metals limits the performance of hyperaccumulators since a large proportion of metals in contaminated soils exist in ‗non-labile‘ state. There came the application of synthetic chelants to enhance the mobility and phytoavailability of metals to remediating plants. Various chelants are available which forms bioavailable and water-soluble stable metal complexes facilitating phytoextraction of these metals at enhanced rates by plants. While chelants are used because of their powerful metal solubilizing properties, it is the same characteristic which gives them the potential of becoming an eco-environmental threat. Environmental concerns are evoked due to the high persistency and poor photo-, chemo- and biodegradability of metal-chelant complexes. Different approaches have been proposed to combat the eco-environmental concerns raised by the use chelants in phytoremediation. Within the scope of this chapter, we will focus on the chelant assisted phytoremediation approaches for the removal of heavy metal contaminants from soil and eco-environmental consequences associated with it. 


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Eco-Environmental Consequences Associated with Chelant-Assisted Phytoremediation of Metal-Contaminated Soil pp. 709-722