Details zur Publikation
|DOI / URL||Link|
|Titel (primär)||Phytovolatilisation of organic chemicals|
|Journal / Serie||Journal of Soils and Sediments|
|Keywords||Emission of VOCs;gas-exchange experiments;organic compounds;phytoremediation;phytovolatilisation;volatile organic;compounds (VOC);Trichloroethylen, 2,6-Dimethylphenol;TSCF: Transpiration stream concentration factor;Kow: n-Octanol/water partition coefficient;Kaw Air/water partition coefficient;|
Independently of the volatilisation of the contaminants from the nutrient solution, the emission rates were determinated under defined, approximated natural conditions by using a dynamic gas exchange chamber. To detect traces of contaminants in air samples with high relative humidity, a purge & trap technology was used. An estimation of the specific emission rates of different materials was made with a transportation model. The model was used to ascertain what compounds are most likely to be emitted by plants due to their physical characteristics.
Results and Conclusions
In experiments with 2,6-Dimethylphenol and Trichloroethylene, a clear link was observed between contaminant emission and the lighting intensity likely to be due to the stomata aperture. The absolute values of the emission rates were very low and in the range of nmol/h m2 foliar surface. The calculation of the emission rates in different scenarios shows lowly higher emission rates for materials with lower n-octanol-water partition coefficients
Recommendations and Outlook
Phytovolatilisation is particularly suitable for eliminating volatile compounds in shallow groundwater contaminations, but the experimental proof of an increased net emission of planted areas with volatile soil contaminants near the surface compared with unplanted areas is still pending. On the basis of the model computations it is rather to be expected that the net emission of volatile lipophilic materials should be reduced into the atmosphere by using plants.
|Baeder-Bederski-Anteda, O. (2003):
Phytovolatilisation of organic chemicals
J. Soils Sediments 3 (2), 65 - 71