Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 687, Issue -, Pages 348-354Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.06.137
Keywords
Environmentally persistent free radicals (EPFRs); Organic-contaminated soil; Pyrolysis; Toxicity; Luminous bacteria; Catechol
Categories
Funding
- Natural Science Foundation of China (NSFC) [21477014]
- Natural Science Foundation of China (NSFC-JST) [21261140334]
- Programof Introducing Talents of Discipline to Universities [B13012]
- Fundamental Research Funds for the Central Universities
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Environmentally persistent free radicals (EPFRs) are detected in the clay, mineral or humic part of the soil, especially in soil contaminated with phenolic compounds. To clarify the detailed information on the formation of EPFRs, we used the contaminated soil with catechol to mimic their formation process in laboratory scale and tested their biotoxicity with luminescent bacteria (Photobacterium phosphoreum, P. phosphoreum). Our results showed that the concentration of EPFRs reached the maximum at pyrolysis temperature of 300 degrees C, and EPFRs could significantly inhibit the luminescence of P. phosphoreum. Based on the detection of center dot OH radicals in the aquatic system we used, we speculated that the generation of center dot OH may be a crucial contributor to the toxicity of EPFRs. Our results aid to understand the detailed process on the formation of EPFRs in contaminated soil, as well as the basic biotoxicity data of EPFRs, which will be helpful and essential for their potential environmental risk assessments. (C) 2019 Elsevier B.V. All rights reserved.
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