Degradation of polycyclic aromatic hydrocarbons (PAHs) in contaminated soils by Fenton's reagent: a multivariate evaluation of the importance of soil characteristics and PAH properties
| Autor: | Sofia Frankki, Mats Tysklind, Bert van Bavel, Ylva Persson, Staffan Lundstedt, Peter Haglund, Sofia Jonsson |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Environmental Engineering
Soil test Health Toxicology and Mutagenesis Iron Industrial Waste chemistry.chemical_compound Soil Waste Management polycyclic compounds Environmental Chemistry Soil Pollutants Organic matter Least-Squares Analysis Polycyclic Aromatic Hydrocarbons Waste Management and Disposal chemistry.chemical_classification Persistent organic pollutant Anthracene Chemistry Hydrogen Peroxide Pollution Soil contamination Hydrocarbon Environmental chemistry Pyrene Oxidation-Reduction Fenton's reagent |
| Zdroj: | Journal of hazardous materials. 149(1) |
| ISSN: | 0304-3894 |
| Popis: | In this study, we investigated how the chemical degradability of polycyclic aromatic hydrocarbons (PAHs) in aged soil samples from various contaminated sites is influenced by soil characteristics and by PAH physico-chemical properties. The results were evaluated using the multivariate statistical tool, partial least squares projections to latent structures (PLS). The PAH-contaminated soil samples were characterised (by pH, conductivity, organic matter content, oxide content, particle size, specific surface area, and the time elapsed since the contamination events, i.e. age), and subjected to relatively mild, slurry-phase Fenton's reaction conditions. In general, low molecular weight PAHs were degraded to a greater extent than large, highly hydrophobic variants. Anthracene, benzo(a)pyrene, and pyrene were more susceptible to degradation than other, structurally similar, PAHs; an effect attributed to the known susceptibility of these compounds to reactions with hydroxyl radicals. The presence of organic matter and the specific surface area of the soil were clearly negatively correlated with the degradation of bi- and tri-cyclic PAHs, whereas the amount of degraded organic matter correlated positively with the degradation of PAHs with five or six fused rings. This was explained by enhanced availability of the larger PAHs, which were released from the organic matter as it degraded. Our study shows that sorption of PAHs is influenced by a combination of soil characteristics and physico-chemical properties of individual PAHs. Multivariate statistical tools have great potential for assessing the relative importance of these parameters. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect