tailieunhanh - Simultaneous removal of some heavy metals and arsenic from aqueous solutions by phragmites australis

In this study, Phragmites australis (common reed) was transplanted into solutions added with different concentrations of Mn, Zn, Cd, Pb, and As for 30 days in the laboratory (10 days of incubation and repeated three times without changing the plant) to assess the removal of these metals and its accumulation in the plant. The results showed that high removal efficiency was achieved by growing . | Journal of Science and Technology 54 (2A) (2016) 259-264 SIMULTANEOUS REMOVAL OF SOME HEAVY METALS AND ARSENIC FROM AQUEOUS SOLUTIONS BY Phragmites australis Tran Thi Huyen Nga*, Nguyen Thi Hoang Ha VNU University of Science, Vietnam National University, 334 Nguyen Trai, Hanoi, Vietnam *Email: tranthihuyennga@ Received: 5 May 2016; Accepted for publication: 26 June 2016 ABSTRACT In this study, Phragmites australis (common reed) was transplanted into solutions added with different concentrations of Mn, Zn, Cd, Pb, and As for 30 days in the laboratory (10 days of incubation and repeated three times without changing the plant) to assess the removal of these metals and its accumulation in the plant. The results showed that high removal efficiency was achieved by growing . The highest daily removal rates of heavy metals and As were obtained after 1 day of new solution addition. The highest concentrations of Mn, Zn, Cd, Pb, and As in the plant roots were 3920, 1020, , 1350, and 183 mg kg–1 dry wt., respectively; those in the stems were 465, 108, , 227, and mg kg–1 dry wt.; and those in the leaves were 716, 150, , 157, and mg kg–1 dry wt. The results of this study indicated that P. australis has the ability to remove simultaneously these metals from water, making it a potential species for phytoremediation of wastewater from Pb-Zn mine. Keywords: arsenic, heavy metals, Phragmites australis, phytoremediation, removal. 1. INTRODUCTION Mining activities including exploitation and processing have generated considerable amounts of waste materials to the surrounding environment [1]. One of the largest Pb-Zn and long-term operation mine in northern Vietnam has been reported to be contaminated with heavy metals and As [2]. Mn and Zn are essential micronutrients for normal plant metabolism, playing an important role in plant growth [3]; however, they are toxic when present in high concentrations [4]. Cd, Pb, and As are not known to be .