Terrestrial environment

Potential of Pteris vittata L. for phytoremediation of sites co-contaminated withcadmium and arsenic: The tolerance and accumulation


XIAO Xiyuan , CHEN Tongbin , AN Zhizhuang , LEI Mei , HUANG Zechun , LIAO Xiaoyong , LIU Yingru

DOI:

Received April 10, 2007,Revised July 11, 2007, Accepted , Available online

Volume 20,2008,Pages 62-67

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Field investigation and greenhouse experiments were conducted to study the tolerance of Pteris vittata L. (Chinese brake) to cadmium (Cd) and its feasibility for remediating sites co-contaminated with Cd and arsenic (As). The results showed that P. vittata could survive in pot soils spiked with 80 mg/kg of Cd and tolerated as great as 301 mg/kg of total Cd and 26.8 mg/kg of diethyltriaminepenta acetic acid (DTPA)-extractable Cd under field conditions. The highest concentration of Cd in fronds was 186 mg/kg under a total soil concentration of 920 mg As/kg and 98.6 mg Cd/kg in the field, whereas just 2.6 mg/kg under greenhouse conditions. Ecotypes of P. vittata were di erentiated in tolerance and accumulation of Cd, and some of them could not only tolerate high concentrations of soil Cd, but also accumulated high concentrations of Cd in their fronds. Arsenic uptake and transportation by P. vittata was not inhibited at lower levels (620 mg/kg) of Cd addition. Compared to the treatment without addition of Cd, the frond As concentration was increased by 103.8% at 20 mg Cd/kg, with the highest level of 6434 mg/kg. The results suggested that the Cd-tolerant ecotype of P. vittata extracted e ectively As and Cd from the site co-contaminated with Cd and As, and might be used to remediate and revegetate this type of site.

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