Uptake of trichloroethylene by hybrid poplar trees grown hydroponically in flow-through plant growth chambers
Journal Article
·
· Environmental Toxicology and Chemistry
Phytoremediation in being promoted as a cost-effective treatment option for shallow groundwater and soils contaminated with trichloroethylene (TCE). However, its effectiveness is difficult to assess due to contradictory reports regarding the magnitude of plant uptake and phytovolatilization. Experimental artifacts and plants stress, resulting from the use of static or low-flow plants growth laboratory systems, may account for part of the discrepancy. High exposure concentrations and short durations may also cause artifacts in laboratory studies. A dual-chamber plant growth system designed to minimize experimental artifacts was used to determine the uptake of [{sup 14}C] TCE by hydroponically grown hybrid poplar as a function of plant stress, exposure concentration, and exposure duration. The [{sup 14}]TCE recoveries ranged from 92 to 101% in 11 dosed chambers. Trichloroethylene mass equivalent concentrations in the shoot tissue were dependent on the amount of water transpired and the exposure concentration. Root-zone oxygen status die not significantly impact TCE uptake. Transpiration stream concentration factors (TSCFs) determined in these studies were independent of exposure duration and are much lower than those previously reported and predicted. The role of TSCF and other factors in estimating the significance of plant uptake in the phytoremediation of TCE-contaminated groundwater is discussed.
- Research Organization:
- Utah State Univ., Logan, UT (US)
- OSTI ID:
- 20080477
- Journal Information:
- Environmental Toxicology and Chemistry, Journal Name: Environmental Toxicology and Chemistry Journal Issue: 4 Vol. 19; ISSN ETOCDK; ISSN 0730-7268
- Country of Publication:
- United States
- Language:
- English
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