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

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