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221.
Kaarina Weckstrm Steve Juggins Atte Korhola 《Ambio-人类环境杂志》2004,33(6):302-305
对受到破坏的海岸生态系统进行成功的管理需要它们过去状况的可靠的科学根据.我们证明,生物指标的沉积物记录可用于在监测记录所经历的较短时间跨度之前对营养盐的浓度进行定量重建.我们为总溶解氮建立了一个具有0.09g/L(对数log10的单位)预测精度的借助于硅藻的、加权平均的、部分最小二乘传递函数模型.该模型被用于处理采自拉亚拉赫蒂(Laajalahti)湾的沉积岩心数据,拉亚拉赫蒂湾是位于芬兰赫尔辛基的一个城市港湾,在该港湾中,该模型的性能在30年的水质数据记录和该流域中已知土地使用变化的基础上得以证实.尽管该模型低估了受到严重影响的该港湾中的高营养盐浓度,但它仍成功跟踪了该营养盐记录中的各种趋势.实际值与预测值之间存在的总体一致性显示出该方法在对沿海水域中的背景营养盐浓度进行评估方面具有的巨大潜力. 相似文献
222.
Technology and information transfer are critical functions within the remediation industry. Researchers in the private sector, academia, and government all struggle to have their findings accepted and put to good use by the remediation industry at large but must work even harder to have their findings accepted and put into practice by state and federal regulators in the environmental agencies overseeing cleanups. Unfortunately, many technology and information transfer efforts fail to reach state and federal regulators, and even fewer achieve regulatory acceptance. A two‐year‐long campaign to deliver a training class on the natural attenuation of chlorinated solvents in groundwater is one prominent example of very effective technology and information transfer. Several of the elements and aspects of that successful training class are presented and discussed in order to provide others with a proven and workable template. © 2010 Wiley Periodicals, Inc. 相似文献
223.
Huan Zhong Ping Li Yongguang Yin Pei Lei Nan Zou Yujiao Liu Weiping Cai Mengjie Wu Wenli Tang Yong Cai Xinbin Feng Shuxiao Wang 《环境科学学报(英文版)》2022,119(9):78-92
Mercury (Hg) could be microbially methylated to the bioaccumulative neurotoxin methylmercury (MeHg), raising health concerns. Understanding the methylation of various Hg species is thus critical in predicting the MeHg risk. Among the known Hg species, mercury sulfide (HgS) is the largest Hg reservoir in the lithosphere and has long been considered to be highly inert. However, with advances in the analytical methods of nanoparticles, HgS nanoparticles (HgS NPs) have recently been detected in various environmental matrices or organisms. Furthermore, pioneering laboratory studies have reported the high bioavailability of HgS NPs. The formation, presence, and transformation (e.g., methylation) of HgS NPs are intricately related to several environmental factors, especially dissolved organic matter (DOM). The complexity of the behavior of HgS NPs and the heterogeneity of DOM prevent us from comprehensively understanding and predicting the risk of HgS NPs. To reveal the role of HgS NPs in Hg biogeochemical cycling, research needs should focus on the following aspects: the formation pathways, the presence, and the environmental behaviors of HgS NPs impacted by the dominant influential factor of DOM. We thus summarized the latest progress in these aspects and proposed future research priorities, e.g., developing the detection techniques of HgS NPs and probing HgS NPs in various matrices, further exploring the interactions between DOM and HgS NPs. Besides, as most of the previous studies were conducted in laboratories, our current knowledge should be further refreshed through field observations, which would help to gain better insights into predicting the Hg risks in natural environment. 相似文献
224.
环境管理与需求分析 总被引:1,自引:0,他引:1
邹欣庆 《中国人口.资源与环境》2000,10(4):24-26
本文着重对环境问题的人的需求进行分析,从满足需求的角度,总结环境管理的经验。 相似文献
225.
226.
Alan Watson Steve Martin Neal Christensen Gregg Fauth Dan Williams 《Environmental management》2015,56(3):653-663
227.
Removal of nutrients and veterinary antibiotics from swine wastewater by a constructed macrophyte floating bed system 总被引:2,自引:0,他引:2
Qiming Xian Lixia Hu Hancheng Chen Zhizhou Chang Huixian Zou 《Journal of environmental management》2010,91(12):2657-2661
The potential of three varieties of Italian ryegrass (Lolium multiflorum Lam.), Dryan, Tachimasari and Waseyutaka, to improve the water quality of swine wastewater was evaluated using a constructed macrophyte floating bed system. With respect to reductions in levels of nutrients, chemical oxygen demand (COD), and sulfonamide antimicrobials (SAs, including sulfadiazine, sulfamethazine, and sulfamethoxazole), Dryan performed better than Tachimasari and Waseyutaka. For Dryan, total N was reduced by 84.0%, total P by 90.4%, COD by 83.4% and sulfonamide antimicrobials by 91.8–99.5%. Similar results were observed for Tachimasari and Waseyutaka. The results indicated that the treatment of swine wastewater using the constructed macrophyte floating bed system was effective in the removal of nutrients and veterinary antibiotics. 相似文献
228.
三氧化硫磺化工艺用于DSD酸生产 总被引:2,自引:0,他引:2
用三氧化硫磺化工艺替代发烟硫酸磺化工艺是可行的。在DSD生产中,采用干燥空气稀释三充气相磺对化硝基甲苯具有反应易控制,副反应少,产品质量好,对设备防腐要求低,投资省等优点,彻底解决了老工艺的废酸问题。 相似文献
229.
Xian Q Chen H Liu H Zou H Yin D 《Environmental science and pollution research international》2006,13(4):233-237
Background, Aims and Scope
Vallisneria spiralis Linn., a common, submerged macrophyte, is widely available in quiet waters of lakes, ponds, marshes and streams in Southeast Asia. V. spiralis plays a significant role not only in decreasing eutrophication of water body for its productivity, but also in inhibiting the growth of blue-green algae? The aim of the paper involves the isolation and identification of allelochemicals from extracts of V. spiralis by activity-guided fractionation and column chromatography.Methods
Leaves of V. spiralis was washed free of debris, air-dried and refluxed in 95% EtOH. The extract was isolated using column chromatography and fractionation with antialgal activity. Potential allelochemicals were analyzed by high-resolution gas chromatography-mass spectrometry (HRGC-MS).Results
Two fractions with strong antialgal activity were isolated using column chromatography and activity-guided fractionation from the extract of V. spiralis. 2-Ethyl-3-methylmaleimide, dihydroactinidiolide and 4-oxo-β-Ionone were identified in the first fraction, and 3-hydroxy-5,6-epoxy-β-ionone, loliolide, 6-hydroxy-3-oxo-α-ionone and an unknown compound in the second fraction. They had strong inhibitory effects on Microcystis aeruginosa Kütz.Discussion
2-Ethyl-3-methylmaleimide is a byproduct of photooxidation of chlorophyll, and five other compounds identified were derivatives of β-carotene. HRGC-MS and derivatization technology were used to identify and confirm their molecular structures. The formula of the unknown compound was C16H19NO4. Metabolites of plant pigments had strong inhibitory activities on growth of algae.Conclusions
Six compounds had been identified in V. spiralis, among them, 2-ethyl-3-methylmaleimide was the main allelochemical, and derivatives of ionone were also potential allelochemicals.Recommendations and Perspective
. The results of our research could help us to study further mechanisms of inhibitory effect on algae and develop new potential antialgal substances. 相似文献230.
湖南长株潭城市群灾害应急管理能力评价 总被引:2,自引:2,他引:2
以城市应急管理能力及其内涵为基础,运用层次分析法,对湖南长株潭城市群灾害应急管理能力进行综合评价.结果表明:①从时间上看,长株潭灾害应急管理能力综合评分值由2005年的5.67、3.66、3.34分别增加到2006年的5.82、4.20、3.98,说明长株潭灾害应急管理能力均有所增强,这是因为应急管理能力是随城市社会经济的发展而增强的;②从空间上看,长株潭灾害应急管理能力存在一定的区域差异;③从整体上看,长株潭的灾害应急管理能力排名为长沙市>株洲市>湘潭市,其主要是由城市化水平及经济实力的差异所致. 相似文献