...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Time-Dependent Remobilization of Nonextractable Benzo[a]pyrene Residues in Contrasting Soils: Effects of Aging, Spiked Concentration, and Soil Properties
【24h】

Time-Dependent Remobilization of Nonextractable Benzo[a]pyrene Residues in Contrasting Soils: Effects of Aging, Spiked Concentration, and Soil Properties

机译：不可转换的苯并[a] re残留物在不同土壤中的时间依赖性迁移：老化，尖峰浓度和土壤性质的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The environmental and health risks associated with "nonextractable" residues (NERs) of polycyclic aromatic hydrocarbons in soils and their potential for remobilization remain largely unexplored. In this novel study, sequential solvent extractions were employed to interrogate time-dependent remobilization of benzo[a]pyrene (B[a]P) NERs and associated kinetics after re-equilibration (REQ) periods lasting 30 d in four artificially spiked soils aged for up to 200 days. Following sequential extractions of the re-equilibrated soils, remobilization of B[a]P NERs was observed and further confirmed by decreases in the absolute amounts of B[a]P recovered following methanolic saponification after REQ. Remobilization may occur through slow intercompartmental partitioning of more sequestered into less sequestered B[a]P fractions in soils. The amounts of B[a]P remobilized in soils decreased throughout aging following first-order kinetics, and the rates of decrease were slow but 2 to 4 times faster than those of extractable B[a]P before re-equilibration. Sandy-clay-loam soils with large amounts of hard organic carbon exhibited less NER remobilization compared to sandy soils. The amounts of remobilized B[a]P decreased significantly (p 0.05) with aging. Specifically, butanol-remobilized B[a]P in soils spiked at 10 mg/kg and 50 mg/kg B[a]P ranged from 0.15 to 0.39 mg/kg and 0.67 to 2.30 mg/kg, respectively, after 200 d of aging.
机译：与土壤中多环芳烃“不可提取的”残基（NER）相关的环境和健康风险及其迁移潜力仍在很大程度上尚未开发。在这项新颖的研究中，采用顺序溶剂萃取法研究了在四个人工加标土壤中持续30 d的苯并[a] re（B [a] P）NERs的时间依赖性迁移以及相关的动力学，该过程持续了30 d。长达200天。在连续提取重新平衡的土壤后，观察到B [a] P NERs的迁移，并通过REQ甲醇皂化后回收的B [a] P绝对量的减少进一步证实。通过在土壤中将更多的多价螯合成较少多价的B [a] P组分进行缓慢的区室间分配，可以实现迁移。在土壤中迁移的B [a] P数量在整个老化过程中遵循一级动力学下降，并且下降速率较慢，但比重新平衡前的可萃取B [a] P快2至4倍。与沙质土壤相比，含大量硬有机碳的沙质粘土壤土的NER迁移较少。随着年龄的增长，B [a] P的转移量显着下降（p <0.05）。具体而言，在200 d后，掺入10 mg / kg和50 mg / kg B [a] P的土壤中丁醇固定的B [a] P分别为0.15至0.39 mg / kg和0.67至2.30 mg / kg。老化。

著录项

  • 来源
    《Environmental Science & Technology》 |2018年第21期|12295-12305|共11页
  • 作者

    Umeh Anthony C.; Duan Luchun; Naidu Ravi; Semple Kirk T.;

  • 作者单位

    Univ Newcastle, GCER, Callaghan, NSW 2308, Australia;

    Univ Lancaster, Lancaster Environm Ctr, Lancaster LA1 4YQ, England;

    Univ Newcastle, CRC CARE, Callaghan, NSW 2308, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号