کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4425000 1619210 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evaluation of dissipation gradients of polycyclic aromatic hydrocarbons in rice rhizosphere utilizing a sequential extraction procedure
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Evaluation of dissipation gradients of polycyclic aromatic hydrocarbons in rice rhizosphere utilizing a sequential extraction procedure
چکیده انگلیسی

The aim of this study was to evaluate the spatial dissipation gradient of PAHs, including phenanthrene, pyrene, and benzo[a]pyrene, with various bioavailability represented with sequential extraction. Dissipation rates of PAHs in the rhizosphere were greater than those in the bulk soil. The n-butanol extracted fraction showed a general trend of dissipation during phytoremediation. Moreover, the formation of bound PAH residues was inhibited in the rhizosphere. While concerning the PAH toxicity, the reduction rates of PAH toxicity were significantly greater than total soil PAH concentrations. Microbial biomass was the highest at four mm away from the root surface. However, the PAH dissipation rates were the highest at one mm and two mm away from the root surface in high and low PAH treatments, respectively. These results suggest that rhizoremediation with rice is a useful approach to reduce the toxicity of PAHs in soil.


► Dissipation gradients were different in soils spiked with different PAHs concentrations.
► Butanol extracted fraction indicated the remediation in rhizosphere.
► Toxicity of PAHs was more efficiently reduced than total concentration.
► Promotion of PAHs degraders was not synchronized with microbial biomass.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental Pollution - Volume 162, March 2012, Pages 413–421
نویسندگان
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