Arsenic hyperaccumulation by Pteris vittata and Pityrogramma calomelanos: a comparative study of uptake efficiency in arsenic-treated soils and waters

被引:25
作者
Yong, J. W. H. [1 ]
Tan, S. N. [1 ]
Ng, Y. F. [1 ]
Low, K. K. K. [1 ]
Peh, S. F. [1 ]
Chua, J. C. [1 ]
Lim, A. A. B. [1 ]
机构
[1] Nanyang Technol Univ, Nat Sci & Sci Educ Acad Grp, Singapore 637616, Singapore
关键词
brake fern; comparative study; hyperaccumulator; phytofiltration; Pityrogramma calomelanos; Pteris vittata; silver fern; CONTAMINATED SOILS; DRINKING-WATER; PHYTOREMEDIATION; FERN; PHYTOFILTRATION; ACCUMULATION; SYSTEM; BRAKE; LAND;
D O I
10.2166/wst.2010.223
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This work comprised of the comparative study of arsenic (As) uptake efficiency by Pteris vittata and Pityrogramma calomelanos grown in (i) As amended soils (0-600 ppm) and (ii) As tainted water (40 ppb) using a new compact continuous flow phytofiltration system in a tropical greenhouse. The As hyperaccumulation efficiency was dependent on the growth medium for the two fern species. The highest level of As detected in the fronds of P. vittata was 19,300 +/- 190ppm (dry weight basis) and 11,600 +/- 230ppm for Pityrogramma calomelanos, after growing for 78 days in soils amended with As. In the compact continuous flow As phytofiltration system experiments, Pityrogramma calomelanos was found to perform better than P. vittata in phytofiltrating As contaminated water under waterlogged conditions. During the 167 h of phytofiltration experiment, the removal efficiency was approximately 99% and 67% for Pityrogramma calomelanos and P. vittata systems respectively, based on an initial 40 ppb As. Pityrogramma calomelanos also required a shorter acclimatization time than P. vittata under waterlogged conditions.
引用
收藏
页码:3041 / 3049
页数:9
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