Investigation of the Accumulation Effect of Pteris vittata L. in Triphenylarsine-Contaminated Soil

The principle and mechanism of triphenylarsine (TPA) accumulation of arsenic hyper-accumulator-Pteris vittata L was investigated to remediate soil contaminated by abandoned arsenical chemical weapons in somewhere in Jilin Province, by means of soil and water culture in the greenhouse. Through analysis of changes in concentrations of total arsenic and TPA in Pteris vittata L. and in inorganic arsenic concentration of water culture solution, observation of apparent characteristics and determination of organic arsenic forms in Pteris vittata L., results show that Pteris vittata L. could accumulate TPA in soil when the concentration of TPA in soil is less than 150 mg/kg, and the concentration of arsenic in Pteris vittata L. increase initially and then decrease with TPA concentration increasing. When Pteris vittata L. had grown 3 months, the TPA concentration reaches its maximum, i.e. 316.85mg/kg (dry), while, the bioconcentration factor (BCF) decreases gradually. Although Pteris vittata L. still could accumulate TPA after TPA concentration reached more than 150 mg/kg, arsenic concentration in Pteris vittata L. significantly reduce due to stress effect of TPA.