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

摘要

This work comprised of the comparative study of arsenic (As) uptake efficiency by Pteris vittatanand Pityrogramma calomelanos grown in (i) As amended soils (0–600 ppm) and (ii) As taintednwater (40 ppb) using a new compact continuous flow phytofiltration system in a tropicalngreenhouse. The As hyperaccumulation efficiency was dependent on the growth mediumnfor the two fern species. The highest level of As detected in the fronds of P. vittata wasn19,300 ^ 190ppm (dry weight basis) and 11,600 ^ 230ppm for Pityrogramma calomelanos,nafter growing for 78 days in soils amended with As. In the compact continuous flow Asnphytofiltration system experiments, Pityrogramma calomelanos was found to performnbetter than P. vittata in phytofiltrating As contaminated water under waterlogged conditions.nDuring the 167 h of phytofiltration experiment, the removal efficiency was approximately 99%nand 67% for Pityrogramma calomelanos and P. vittata systems respectively, based on anninitial 40 ppb As. Pityrogramma calomelanos also required a shorter acclimatization time thannP. vittata under waterlogged conditions.