贾凌云

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教授

博士生导师

硕士生导师

主要任职:生物工程学院院长、党委副书记

性别:女

毕业院校:大连理工大学

学位:博士

所在单位:生物工程学院

学科:生物工程与技术. 生物化工

办公地点:知微楼519房间

电子邮箱:lyjia@dlut.edu.cn

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Hydroxypropyl-beta-cyclodextrin extractability and bioavailability of phenanthrene in humin and humic acid fractions from different soils and sediments

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论文类型:期刊论文

发表时间:2014-07-01

发表刊物:ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

收录刊物:PubMed、SCIE

卷号:21

期号:14

页面范围:8620-8630

ISSN号:0944-1344

关键字:HPCD; Biodegradation; Phenanthrene; Bioavailability; Humin; Humic acid

摘要:Organic matter (OM) plays a vital role in controlling polycyclic aromatic hydrocarbon (PAH) bioavailability in soils and sediments. In this study, both a hydroxypropyl-beta-cyclodextrin (HPCD) extraction test and a biodegradation test were performed to evaluate the bioavailability of phenanthrene in seven different bulk soil/sediment samples and two OM components (humin fractions and humic acid (HA) fractions) separated from these soils/sediments. Results showed that both the extent of HPCD-extractable phenanthrene and the extent of biodegradable phenanthrene in humin fraction were lower than those in the respective HA fraction and source soil/sediment, demonstrating the limited bioavailability of phenanthrene in the humin fraction. For the source soils/sediments and the humin fractions, significant inverse relationships were observed between the sorption capacities for phenanthrene and the amounts of HPCD-extractable or biodegradable phenanthrene (p < 0.05), suggesting the importance of the sorption capacity in affecting desorption and biodegradation of phenanthrene. Strong linear relationships were observed between the amount of HPCD-extractable phenanthrene and the amount degraded in both the bulk soils/sediments and the humin fractions, with both slopes close to 1. On the other hand, in the case of phenanthrene contained in HA, a poor relationship was observed between the amount of phenanthrene extracted by HPCD and the amount degraded, with the former being much less than the latter. The results revealed the importance of humin fraction in affecting the bioavailability of phenanthrene in the bulk soils/sediments, which would deepen our understanding of the organic matter fractions in affecting desorption and biodegradation of organic pollutants and provide theoretical support for remediation and risk assessment of contaminated soils and sediments.