Effects of dissolved organic carbon on desorption of aged phenanthrene from contaminated soils: A mechanistic study
文献类型：期刊论文
| 作者 | Luo, Lei; Chen, Zien; Cheng, Yuan2; Lv, Jitao; Cao, Dong ; Wen, Bei
|
| 刊名 | ENVIRONMENTAL POLLUTION
 |
| 出版日期 | 2019-11-01 |
| 卷号 | 254页码:- |
| 关键词 | Dissolved organic carbon Oxalate Phenanthrene Release Soil |
| ISSN号 | 0269-7491 |
| 英文摘要 | Dissolved organic carbon (DOC) has a major influence upon sorption/desorption and transport of hydrophobic organic contaminants (HOCs) in soil environments. However, the molecular mechanisms of DOC sorption and its effects on aged HOC desorption in contaminated soils still remain largely unclear. Here, effects of three different DOC (one from commercial peat and two from biochars produced at 300 degrees C and 500 degrees C pyrolysis temperatures, respectively) and oxalate (as a reference) on abiotic desorption behavior of aged phenanthrene from three agricultural soils were investigated. Results showed that desorption of aged phenanthrene from soils was predominantly dependent on soil organic carbon content. The presence of DOC and oxalate resulted in higher desorption of phenanthrene compared to water alone, and the effects were positively related to soil organic carbon content and DOC/oxalate concentration. The facilitating effects of DOC were further increased during the second consecutive desorption, whereas oxalate had no such effect. Ultra-high-resolution Fourier transform-ion cyclotron resonance-mass spectrometry confirmed the molecular fractionation of DOC at the soil-water interface during DOC sorption. Specifically, the DOC molecules with O-rich moieties were preferentially adsorbed, whereas the molecules with phenolic and aromatic structures were selectively retained in the soil solutions through competitive displacement and co-sorption reactions during sorption. The enriched phenyl structures in the retained DOC facilitated its association with phenanthrene in the solutions and thus the release of phenanthrene from the soils. In contrast, oxalate replaced some organic carbon from the soils and thus released the associated phenanthrene into the solutions. Our findings highlight the importance of the molecular composition and structure of DOC for the desorption of phenanthrene in soil-water environments, which may help improve our understanding of the release and transport of organic compounds in the environments. (C) 2019 Elsevier Ltd. All rights reserved. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/42534]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, State Key Lab Environm Chem & Ecotoxicol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China |
| 推荐引用方式 GB/T 7714 | Luo, Lei,Chen, Zien,Cheng, Yuan,et al. Effects of dissolved organic carbon on desorption of aged phenanthrene from contaminated soils: A mechanistic study[J]. ENVIRONMENTAL POLLUTION,2019,254:-. |
| APA | Luo, Lei,Chen, Zien,Cheng, Yuan,Lv, Jitao,Cao, Dong,&Wen, Bei.(2019).Effects of dissolved organic carbon on desorption of aged phenanthrene from contaminated soils: A mechanistic study.ENVIRONMENTAL POLLUTION,254,-. |
| MLA | Luo, Lei,et al."Effects of dissolved organic carbon on desorption of aged phenanthrene from contaminated soils: A mechanistic study".ENVIRONMENTAL POLLUTION 254(2019):-. |
入库方式： OAI收割
来源：生态环境研究中心
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