Arsenic, lead and cadmium removal potential of <i>Pteris multifida</i> from contaminated water and soil

Abstract

The main threats to the environment from heavy metals are associated with arsenic (As), lead (Pb) and cadmium (Cd). In this study, the potential of <i>Pteris multifida</i> for removing As, Pb and Cd from hydroponic solution and pot soil was evaluated for the first time. Short-term (5 day) experiments were conducted to assess phytofiltration efficiency of temperate zone fern <i>P. multifida</i> and to compare it with mostly studied tropical zone fern <i>P. vittata.</i> Within 5 days, <i>P. multifida</i> accumulated 33% of As(III), whereas <i>P. vittata</i> could not accumulate that most toxic arsenic species As(III) at all. Long-term hydroponic results showed that 90% of Pb, 50% of As and 36% of Cd were removed by <i>P. multifida</i>. Concentration of As in the frond (22 mg/kg dw) was comparatively higher than other parts of plant and significantly higher concentration of Cd and Pb were stored in root and rhizome. Pot soil experiment of <i>P multifida</i> confirmed the comparative uptake and translocation of As(V), Pb and Cd from soil. Therefore, from the assessment of heavy metal accumulation capacity, translocation and healthy survival for long time, <i>P. multifida</i> was identified as an excellent species for the treatment of multi-metal contaminated water and soil.