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论文类型：期刊论文

发表时间：2019-10-15

发表刊物：SCIENCE OF THE TOTAL ENVIRONMENT

收录刊物：EI、PubMed、SCIE

卷号：687

页面范围：348-354

ISSN号：0048-9697

关键字：Environmentally persistent free radicals (EPFRs); Organic-contaminated soil; Pyrolysis; Toxicity; Luminous bacteria; Catechol

摘要：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.