Evaluation of phytoextracting cadmium and lead by sunflower, ricinus, alfalfa and mustard in hydropo

• 作 者: NIU Zhi-xin SUN Li-na SUN Tie-heng LI Yu-shuang WANG Hong
• 机 构: Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;Shenyang Universit
• 出 处: 环境科学学报（英文版）
• 发表日期: 2007年8期
• 关键词: phytoextraction heavy metals plants cadmium lead

Soil contaminated with heavy metals cadmium (Cd) and lead (Pb) is hard to be remediated. Phytoremediation may be a feasible method to remove toxic metals from soil, but there are few suitable plants which can hyperaccumulate metals. In this study, Cd and Pb accumulation by four plants including sunflower (Helianthus annuus L.), mustard (Brassica juncea L.), alfalfa (Medicago sativa L.), ricinus (Ricinus communis L.) in hydroponic cultures was compared. Results showed that these plants could phytoextract heavy metals, the ability of accumulation differed with species, concentrations and categories of heavy metals. Values of BCF (bioconcentration factor) and TF (translocation factor) indicated that four species had dissimilar abilities of phytoextraction and transportation of heavy metals. Changes on the biomass of plants, pH and Eh at different treatments revealed that these four plants had distinct responses to Cd and Pb in cultures. Measurements should be taken to improve the phytoremediation of sites contaminated with heavy metals, such as pH and Eh regulations, and so forth.