| Title: | Leachability of volatile fuel compounds from contaminated soils and the effect of plant exudates: A comparison of column and batch leaching tests |
| Author(s): | Balseiro-Romero M; Kidd PS; Monterroso C; |
| Address: | "Department of Soil Science and Agricultural Chemistry, University of Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, Spain. Electronic address: maria.balseiro@usc.es. Instituto de Investigacions Agrobioloxicas de Galicia (IIAG), Consejo Superior de Investigaciones Cientificas (CSIC), 15780 Santiago de Compostela, Spain. Department of Soil Science and Agricultural Chemistry, University of Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, Spain" |
| DOI: | 10.1016/j.jhazmat.2015.11.017 |
| ISSN/ISBN: | 1873-3336 (Electronic) 0304-3894 (Linking) |
| Abstract: | "Volatile fuel compounds such as fuel oxygenates (FO) (MTBE and ETBE) and BTEX (benzene, toluene, ethylbenzene and xylene) are some of the most soluble components of fuel. Characterizing the leaching potential of these compounds is essential for predicting their mobility through the soil profile and assessing the risk of groundwater contamination. Plant root exudates can play an important role in the modification of contaminant mobility in soil-plant systems, and such effects should also be considered in leaching studies. Artificially spiked samples of A and B horizons from an alumi-umbric Cambisol were leached in packed-columns and batch experiments using Milli-Q water and plant root exudates as leaching agents. The leaching potential and rate were strongly influenced by soil-contaminant interactions and by the presence of root exudates. Organic matter in A horizon preferably sorbed the most non-polar contaminants, lowering their leaching potential, and this effect was enhanced by the presence of root exudates. On the other hand, the inorganic components of the B horizon, showed a greater affinity for polar molecules, and the presence of root exudates enhanced the desorption of the contaminants. Column experiments resulted in a more realistic protocol than batch tests for predicting the leaching potential of volatile organic compounds in dissimilar soils" |
| Keywords: | Adsorption Benzene Derivatives/*chemistry Ethyl Ethers/*chemistry Holcus Methyl Ethers/*chemistry Plant Exudates/*chemistry Soil/chemistry Soil Pollutants/*chemistry Batch Leaching potential Packed-columns Plant root exudates Volatile fuel contaminants; |
| Notes: | "MedlineBalseiro-Romero, Maria Kidd, Petra S Monterroso, Carmen eng Comparative Study Research Support, Non-U.S. Gov't Netherlands 2015/12/01 J Hazard Mater. 2016 Mar 5; 304:481-9. doi: 10.1016/j.jhazmat.2015.11.017. Epub 2015 Nov 17" |
