Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 581, Issue -, Pages 530-540Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2016.12.161
Keywords
Polycyclic aromatic hydrocarbons (PAHs); Soil; Solar radiation; Photodegradation; By-products
Categories
Funding
- Spanish Ministry of Economy and Competitiveness (Mineco) [CTM2012-33079]
- AGAUR (Commissioner for Universities and Research of the Department of Innovation, Universities and Enterprise of the Generalitat de Catalunya)
- AGAUR (European Social Fund)
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The photodegradation of polycyclic aromatic hydrocarbons (PAHs) may be an important degradation pathway of PAHs in regions with a high solar radiation. The present investigation was aimed at studying the photodegradation of PAHs after their deposition on surface soils with different textures. Photodegradation by-products were also identified and semi -quantified, as well as correlated with the decrease of parent compounds. The experiment was performed by deploying soil samples spiked with a mixture of the 16 US EPA priority PAHs in a methacrylate box, exposed to solar radiation for 7 days, meaning a solar energy of 102.6 MJ m(-2). As hypoth-esized, the individual PAHs were volatilized, sorbed and/or photodegraded, depending on their physicochemical properties, as well as the soil characteristics. Low and medium molecular weight PAHs were more sorbed and photodegraded in fine-textured Regosol soil, while a higher volatilization was observed in the coarse-textured Arenosol soil. In contrast, high molecular weight PAHs were more photodegraded in Arenosol soil. Specially low half-lives were noted for anthracene and benzo(a)pyrene, agreeing with previous findings at laboratory scale. Nine by-products were identified, including oxy-, nitro- and hydro-PAHs, whose toxic and mutagenic potential might be higher than the 16 priority PAHs.
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