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Possible formation of polycyclic aromatic hydrocarbons (PAHs) through biological processes in soil was investigated. Soil, plant material, and a mixture of both were waterlogged and incubated for 2 years, resulting in long lasting oxygen deficient conditions. Sample extracts were analysed by HPLC for 15 PAHs. In soil with or without added plant material, the contents of 4-, 5-, and 6-ring PAHs increased...
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