Removal of zinc and cadmium from contaminated soils by Alfalfa plant
Subject Areas :Abdolreza Karbassi 1 , Pegah Kharazian 2
1 - دانشکده محیط زیست و انرژِ دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران
2 - دانشجوی کارشناسی ارشد مدیریت محیط زیست دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران
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Abstract :
Some plant species named hyper accumulator plants have necessary potential toabsorb, tolerate, remove and extract a large amount of heavy metals from the soil.Use of this plant is an appropriate commercial technology to clean up ofcontaminated soils. Some grass plants with deep roots, have more potential toremove soil heavy metals. Alfalfa from leguminous family which is an indigenousplant in all warm and cold weather conditions of Iran, with deep roots and shortgrowth period, is specific plant to remove more pollutants from the polluted soils.In this paper, we tried to determine the different concentration of Zinc andCadmium in soil, with use of Alfalfa plant and also discuss its bioaccessibility, thencompare them with pH soil. Subsequently the effect of pH on adsorption of metalswas studied. Four soil pots were artificially contaminated with 100 ppm, 200 ppm,400ppm Zn and 500ppm, 1000ppm, 2000 ppm Cd and Alfalfa plant was cultivatedin all of them. Later, agronomic practices have done on these processes todetermine the effective parameters such as pH with statistical methods such ascluster analysis and MVSP software. As a result, analysis of plant, soil and itsbioaccessibility reveal that alfalfa has special potential to extract both Zn and Cdtogether in the same manner.
