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土壤中多环芳烃(PAHs)污染已成为一个严重的环境问题。因此,有必要开展低成本、高效的微生物修复技术研究。本文从土壤中PAHs的环境污染特征出发,结合近年来利用微生物修复技术去除土壤中PAHs的研究进展,剖析该技术工程应用存在的挑战及其解决策略。并对微生物与PAHs之间的作用机制进行介绍,指出细菌降解PAHs主要通过双加氧酶的作用,真菌降解PAHs利用的是单加氧酶,而藻类降解低环PAHs主要采用单加氧酶系统进行代谢,降解高环PAHs则主要采用双加氧酶系统进行代谢。最后提出了未来PAHs污染土壤修复技术的主要研究方向,包括建立高效降解菌筛选体系、构建混合菌群及基因工程菌、加强作用过程及代谢组学研究等方面,以期为我国土壤修复技术的产业化发展和大规模应用提供指导。 相似文献
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土壤中多环芳烃(PAHs)污染已成为一个严重的环境问题。因此,有必要开展低成本、高效的微生物修复技术研究。本文从土壤中PAHs的环境污染特征出发,结合近年来利用微生物修复技术去除土壤中PAHs的研究进展,剖析该技术工程应用存在的挑战及其解决策略。并对微生物与PAHs之间的作用机制进行介绍,指出细菌降解PAHs主要通过双加氧酶的作用,真菌降解PAHs利用的是单加氧酶,而藻类降解低环PAHs主要采用单加氧酶系统进行代谢,降解高环PAHs则主要采用双加氧酶系统进行代谢。最后提出了未来PAHs污染土壤修复技术的主要研究方向,包括建立高效降解菌筛选体系、构建混合菌群及基因工程菌、加强作用过程及代谢组学研究等方面,以期为我国土壤修复技术的产业化发展和大规模应用提供指导。 相似文献
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本文研究了焦作市博爱土壤剖面多环芳烃(PAHs)含量的分布特征。发现在美国EPA优先控制的16种PAHs中,检测出8种,PAHs主要分布在0—40cm土层中,PAHs总含量与土壤深度的增加无明显相关性。 相似文献
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土壤中多环芳烃毒性大、难降解,对其含量进行准确分析在指导风险评估和制定土壤修复方案方面起着重大作用.从方法原理、优缺点方面对近年来土壤中多环芳烃预处理和仪器检测方法的研究现状进行综述,将检测方法进行比较,根据测试需求选择合适的分析方法.展望发展趋势可以看出,研究便捷高效的预处理方法、对衍生物同步检测和开发在线监测技术是未来土壤中多环芳烃检测技术研究的重要方向. 相似文献
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土壤中多环芳烃的预处理及含量分析方法综述 总被引:1,自引:0,他引:1
概述了国内外土壤样品中多环芳烃(PAHs)的预处理及含量分析方法的研究现状,其中提取方法包括索氏提取、超声提取、微波提取(MAE)、加速溶剂萃取(ASE)、超临界流体萃取(SFE)及其协同提取方法等。测定方法有高效液相色谱(HPLC)法、气相色谱-质谱联用(GC/MS)法和恒能量同步荧光(CESF)法等。对各种提取和分析方法进行了比较并对土壤样品中多环芳烃前处理和分析检测技术的发展进行展望。 相似文献
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Selina M Bamforth Ian Singleton 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2005,80(7):723-736
Polycyclic aromatic hydrocarbons (PAHs) are a class of organic compounds that have accumulated in the natural environment mainly as a result of anthropogenic activities such as the combustion of fossil fuels. Interest has surrounded the occurrence and distribution of PAHs for many decades due to their potentially harmful effects to human health. This concern has prompted researchers to address ways to detoxify/remove these organic compounds from the natural environment. Bioremediation is one approach that has been used to remediate contaminated land and waters, and promotes the natural attenuation of the contaminants using the in situ microbial community of the site. This review discusses the variety of fungi and bacteria that are capable of these transformations, describes the major aerobic and anaerobic breakdown pathways, and highlights some of the bioremediation technologies that are currently available. Copyright © 2005 Society of Chemical Industry 相似文献
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Polycyclic aromatic hydrocarbons (PAHs) are the most commonly found pollutants in former coke site grounds. These organic pollutants are particularly a concern because of their possible toxic, carcinogenic or mutagenic properties. Biodegradation is one possible pathway for PAHs elimination from soils. This study aims to evaluate intrinsic degradation potential of PAHs in soils taken from two former coke sites, differing by their contamination levels and by their physico-chemical characteristics (organic carbon and metal contents).PAHs biodegradation kinetics as observed in both soil types distinguishes between two steps: a first step showing a rapid but short PAHs abiotic degradation, followed by a second step which is characterized by a much slower PAHs decrease pattern, progressively smoothing along time. These patterns lead to a significant decrease in the bulk PAHs content of 35% and 46% respectively for site 1 and site 2 soils after 12 months. In this experiment, PAHs degradation seems to be altered neither by the conditions of the medium (availability of carbon, phosphorus, nitrogen, moisture, oxygen …), nor by any decrease in bacterial degrading activity, but rather by lack of PAHs' bioavailability and recalcitrance of some degradation products. If the occurrence of metals and organic carbon does not alter the bulk yield of PAHs' degradation, it does modify the degradation pattern, insofar as bacterial processes seem to need longer to set when metals and organic carbon are present in higher amounts. 相似文献
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Svetlana Sushkova Tatiana Minkina Irina Deryabkina Elena Antonenko Saglara Mandzhieva Inna Zamulina 《Polycyclic Aromatic Compounds》2013,33(5):395-403
ABSTRACTThe assessment of toxic effects of polycyclic aromatic hydrocarbons (PAHs) on Haplic chernozems soil was developed by using spring barley (Hordeum sativum distichum) bioaccumulation tendencies. Spring barley was used to estimate the negative effect of chernozemic soil contamination with benzo[a]pyrene (BaP), one the most carcinogenic and mutagenic PAHs compounds. The bioaccumulation tendencies were studied in soil spiking with BaP. Spiked doses were close to technogenic pressure level in studied area, 0–800 µg/kg of BaP. Condition and doses of BaP during 4 years of model experiment influenced morphometric characteristics of spring barley and rates of BaP uptake by plants. Exposure to the growth characteristics containing at least 20 µg/kg BaP promoted absorbing BaP by plants root system as well as increased roots length. Tendencies of phytotoxicity parameters inhibition were observed for all morphometric characteristics of spring barley as energy of germination, length of vegetation part, plant weight and ear height. Quantifiable levels of BaP uptake by spring barley roots exceeded vegetative part more than 2.5 times in all polluted variants. The constant of BaP semi-degradation in artificially polluted Haplic chernozems for 48 months of model experiment T50 reached 1.2–3.4 years. Thus, the BaP uptake by spring barley from chernozem soil contributes to the bioindication responses during environmental monitoring to assess the impact of BaP pollution. 相似文献
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Zhiguo Cao Qiaoying Chen Jingling Liu Guangxuan Yan Menglei Wang 《Polycyclic Aromatic Compounds》2018,38(1):1-12
The distribution, composition, and source of 16 polycyclic aromatic hydrocarbons (PAHs) in the Luan River, China, were investigated in this study. The compositional profiles of PAHs in the three mediums represented different characteristics. In different land-use areas, compositional profiles of PAHs in water were familiar, while that in sediment and bank soil presented differences. The spatial distribution of PAHs indicated that the most polluted sites all gathered in the middle and lower reaches of the region, which was different from other rivers in China. The PAH data of bank soil were used for source identification. Both diagnostic ratios of selected PAHs and principal component analysis (PCA) with multiple linear regression (MLR) analysis were studied, suggesting mixed source of PAHs in the Luan River Basin. 相似文献
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文章用改进索氏提取器与自动索氏提取器提取土壤中加标多环芳烃(菲、蒽、屈),采用高效液相色谱法对提取液进行分离测定,并选择了流动相最佳比例。结果表明,采用改进索氏提取器,二氯甲烷作提取剂,氧化铝柱层析法纯化,并用HPLC—UVD测定可得到很好的效果。三种多环芳烃的平均加标回收率在78.7%~111%之间,且重现性较好。 相似文献