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The Euphrates River is one of the major rivers in Iraq. When it reaches north of Hilla city, it will be divided in two branches. One of these braches flows toward Hilla city. On this branch, six locations were studied for the water quality of the Euphrates water. The present paper is aimed to fill the gap of information of the presence of PAHs (poly aromatic hydrocarbons) in water and sediment of AI-Hilla River, as well as to determine the quality and quantity of some PAHs. The depth of the river ranges from 2 m to 6 m. The quality, quantity and the origin of PAHs were studied in the water and sediment of Al-Hilla River. In addition, some physical and chemical properties were studied at six sites along the studied area, for the period March, 2010 to February, 2011. Sixteen PAHs that are listed by USEPA (US Environmental Protection Agency) as priority pollutants (Nap (naphthalene), Acpy (acenaphthylene), Acp (acenaphthene), Flu (fluorine), Phen (phenanthrene), Ant (anthracene), Flur (fluoranthene), Py (pyrene), B(a)A (benzo(a)anthracene), Chry (chrysene), B(b)F (benzo(b)fluoranthene), B(k)F (benzo(k)fluoranthene), B(a)p (benzo(a)pyrene), BbA (dibenzo(a,h)anthracene), B(ghi)P (benzo(ghi)perylene) and Ind (indeno (1,2,3-cd) pyrene)) were detected in Al-Hilla river. High concentrations of PAHs were detected in the sediment relative to that within the water. The present study revealed that the origin of PAHs in water and sediment might be the pyrogenic origin.  相似文献
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从长江、嘉陵江(简称两江)重庆段的5个表层沉积物样品(JL1、JL2、YZ1、YZ2、YZ3)中提取腐殖酸,对其进行了化学组成分析和结构特性表征.结果表明,各样点的腐殖酸中元素含量比值(H/C值、O/C值、C/N值等)存在一定的差异.JL1、YZ3和YZ1样品中的腐殖酸具有较高的O/C值和H/C值,呈现明显的脂肪特性,而YZ2样品的芳香性特征相对明显;各样点腐殖酸的C/N值>10,表明受藻类污染的潜势较低.傅里叶红外图谱结果表明,各样点腐殖酸的官能团结构组成相似度较高,均含有羧基、羟基、羰基等活性官能团,但官能团的含量存在差异.借助荧光光谱分析,进行腐殖酸对荧蒽的吸附特性试验以及吸附等温线修正Freundlich模型模拟,修正吸附系数(Kf')的大小顺序为:YZ2> JL2> YZ1>YZ3> JL1,且吸附能力与腐殖酸的极性强弱、元素含量、活性官能团特征等具有一定的相关性;在连续多步解吸附试验中,相对于加标荧蒽的吸附量,各样点的解吸率为40.3% ~74.8%.  相似文献
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《Planning》2016,(18)
采用平板和液体培养技术,研究了1株海洋源裂褶菌(Schizophyllum commune MCCC 3A00233)降解多环芳烃(polycyclic aromatic hydrocarbons,PAHs)类化合物菲、荧蒽的效率及机理。结果表明:裂褶菌MCCC 3A00233对菲、荧蒽具有较高的耐受性,在质量浓度高达200mg/L的平板上,菌丝生长的抑制率≤25%;当菲、荧蒽的质量浓度为50mg/L时,菌株生长最快,培养10d对菲、荧蒽的降解率≥80%,降解产物对植物、微生物的毒性大大减小。另外,该菌对菲、荧蒽的降解作用主要是通过产生锰过氧化物酶(manganese peroxidase,MnP),其次为木质素过氧化物酶(lignin peroxidase,LiP)和漆酶(Laccase)而起作用的,其中Lip和Laccase在该菌降解菲、荧蒽的起始阶段发挥重要作用。这些结果表明,裂褶菌MCCC 3A00233是1株高效降解菲、荧蒽的白腐真菌,可用于海水中PAHs类污染物的降解。  相似文献
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