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城市环境保护满意度及案例分析 总被引:4,自引:1,他引:3
公众对城市"创建环境保护模范城市"活动的过程与结果是否认可与满意,是"创建环境保护模范城市"的最终衡量标准.针对现行环境保护满意率调查问卷存在问题.根据"创建环境保护模范城市"的目标,重新设计了调查新问卷.调查指标包括城市环境质量、政府环境保护工作等方面,采用随机抽样方法,抽取样本1 610份.结果表明,城市环境保护满意度可以作为城市环境状况和政府环境保护工作绩效的一种评估方法;满意度对人们可感知的环境质量评估效果较好;不同群体满意度间差异较大,应制定有针对性的环境保护政策,提高政策效率;城市环境保护满意度评估是对以环境质量监测数据为主的城市环境质量评估的必要补充. 相似文献
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"书·藏古今,港·通天下"--位于东海之滨的宁波市是我国首批沿海对外开放城市、计划单列市和全国15个副省级城市之一,也是全国历史文化名城、国家园林城市、国家优秀旅游城市、国家卫生城市、国家环保模范城市和全国首批文明城市.近年来,在宁波市委、市政府的领导下,全市各级各部门解放思想,抢抓机遇,在国民经济持续快速健康发展、城市综合实力显著提升的同时,环境保护工作也全面得到加强,特别是固体废物环境污染防治工作取得了长足的进步. 相似文献
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城市是一个国家或地区政治、经济和文化活动的中心.随着经济的发展,特别是工业的发展,使资源和能源在城市地区集中或转换,同时产生大量废物.由此改变了原来的自然生态平衡,形成了城市特有的生态系统,加重了环境污染,直接影响和危害人民的生产和生活.因此,城市环境问题是当代一切国家面临的重大问题之一.各国城市环境问题既有共同性,又有特殊性.如何根据我国国情,借鉴外国的经验,探讨我国城市环境保护的途径是极待认真研究的课题. 城市环境问题主要是大气和水环境的污 相似文献
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中国流域水环境保护规划体系设计 总被引:1,自引:0,他引:1
现行与流域水环境保护相关的规划很多,但是由于各地区、各部门协调不足,规划间没有明确的关系,缺乏接口和控制,规划内容不统一,致使流域水环境保护规划没有形成体系。基于流域水环境保护相关规划存在的问题和当前的政府管理体制,提出了由国家流域水环境保护总体规划、小流域水环境保护规划、城市水环境保护规划和大点源水污染物减排规划构成的流域水环境保护规划体系。明确了该体系内,上级规划通过审批和评估实现对下级规划的指导与控制,规划之间的衔接关系体现为指标的联结。同时,提出了制定流域水环境保护规划法规、制定规划编制规范和指南、建立信息共享平台等建议。 相似文献
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环境质量综合指数是南京市建设“小康社会”的难点、核心指标,通过分析环境质量状况和环境保护工作的现状,提出了创建期间有关环保工作的机制、管理的重点和工程措施等对策与措施. 相似文献
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The sorption and desorption of Cu and Cd by two species of brown macroalgae and five species of microalgae were studied. The two brown macroalgae, Laminaria japonica and Sargassum kjellmanianum, were found to have high capacities at pHs between 4.0 and 5.0 while for microalgae, optimum pH lay at 6.7. The presence of other cations in solution was found to reduce the sorption of the target cation, suggesting a competition for sorption sites on organisms. Sorption isotherms obeyed the Freundlich equation, suggesting involvement of a multiplicity of mechanisms and sorption sites. For the microalgae tested, Spirulina platensis had the highest capacity for Cd, followed by Nannochloropsis oculata, Phaeodactylum tricornutum, Platymonas cordifolia and Chaetoceros minutissimus. The reversibility of metal sorption by macroalgae was examined and the results show that both HCl and EDTA solutions were very effective in desorbing sorbed metal ions from macroalgae, with up to 99.5% of metals being recovered. The regenerated biomass showed undiminished sorption performance for the two metals studied, suggesting the potential of such material for use in water and wastewater treatment. 相似文献
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A R Main 《Journal of environmental science and health. Part. B》1983,18(1):29-63
The kinetic and structural relationships of eight electrophoretically pure mammalian serum and liver serine carboxylesterases (CE) and cholinesterases (ChE) have been studied. Eight CE's and ChE's, which were fully resolved but only partially purified, provided additional information. Five of the electrophoretically pure esterases were monomeric, and of these, four belonged to a new and widely distributed class. These four monomeric esterases hydrolyzed choline esters, but at widely differing rates. Thus two were termed monomeric butyrylcholinesterases, mBuChE I and II, and two were monomeric CE's (mCE). The rabbit liver mCE was not a subunit of the oligomeric CE (oCE), although the oCE also hydrolyzed choline esters at a very low rate. The complex kinetics of the mCE's, mBuChE's, oCE's, and of the oligomeric BuChE's of horse and human serum could be interpreted according to a single reaction scheme involving an allosteric site and the equation derived from it. Thus activation and inhibition at high substrate concentrations, together with sigmoidal activity versus substrate concentration plots, all of which characterize the reactions of these esterases, could be interpreted by a single scheme and equation. Structural and kinetic comparisons showed a progressive transition of properties from the oCE's through the mCE's to the oBuChE's. One of the purified mCE's was from horse serum, and it exhibited physical and kinetic properties unlike those of the liver mCE's or oCE's. 相似文献
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Soudamini Mohapatra 《Journal of environmental science and health. Part. B》2013,48(7):513-520
The persistence and dissipation kinetics of trifloxystrobin and tebuconazole on onion were studied after application of their combination formulation at a standard and double dose of 75 + 150 and 150 + 300 g a.i. ha?1. The fungicides were extracted with acetone, cleaned-up using activated charcoal (trifloxystrobin) and neutral alumina (tebuconazole). Analysis was carried out by gas chromatograph (GC) and confirmed by gas chromatograph mass spectrometry (GC-MS). The recovery was above 80% and limit of quantification (LOQ) 0.05 mg kg?1 for both fungicides. Initial residue deposits of trifloxystrobin were 0.68 and 1.01 mg kg?1 and tebuconazole 0.673 and 1.95 mg kg?1 from standard and double dose treatments, respectively. Dissipation of the fungicides followed first-order kinetics and the half life of degradation was 6–6.6 days. Matured onion bulb (and field soil) harvested after 30 days was free from fungicide residues. These findings suggest recommended safe pre-harvest interval (PHI) of 14 and 25 days for spring onion consumption after treatment of Nativo 75 WG at the standard and double doses, respectively. Matured onion bulbs at harvest were free from fungicide residues. 相似文献
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Singh Nishi Kumari Choudhary Sangeeta 《Environmental science and pollution research international》2021,28(42):58819-58836
Environmental Science and Pollution Research - Hydrocarbon is a primary source of energy in the current urbanized society. Considering the increasing demand, worldwide oil productions are declining... 相似文献
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Polati S Gosetti F Gianotti V Gennaro MC 《Journal of environmental science and health. Part. B》2006,41(6):765-779
The bioavailability of pollutants, pesticides and/or their degradation products in soil depends on the strength of their sorption by the different soil components, particularly by the clay minerals. This study reports the sorption-desorption behavior of the environmentally hazardous industrial pollutants and certain pesticides degradation products, 3-chloroaniline, 3,4-dichloroaniline, 2,4,6-trichloroaniline, 4-chlorophenol, 2,4-dichlorophenol and 2,4,6-trichlorophenol on the reference clays kaolinite KGa-1 and Na-montmorillonite SWy-l. In batch studies, 2.0 g of clay were equilibrated with 100.0 mL solutions of each chemical at concentrations ranging from 10.0 to 200.0 mg/L. The uptake of the compounds was deduced from the results of HPLC-UV-Vis analysis. The lipophilic species were best retained by both clay materials. The most lipophilic chemical used in the study, 2,4,6-trichloroaniline, was also the most strongly retained, with sorption of up to 8 mg/g. In desorption experiments, which also relied on HPLC-UV-Vis technique, 2,4,6-trichloroaniline was the least desorbed from montmorillonite. However, on kaolinite all of the compounds under study were irreversibly retained. The experimental data have been modelled according to the Langmuir and Freundlich isotherms. A hypothesis is proposed concerning the sorption mechanism and potential applications of the findings in remediation strategies have been suggested. 相似文献
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STEFANO POLATI FABIO GOSETTI VALENTINA GIANOTTI MARIA CARLA GENNARO 《Journal of environmental science and health. Part. B》2013,48(6):765-779
The bioavailability of pollutants, pesticides and/or their degradation products in soil depends on the strength of their sorption by the different soil components, particularly by the clay minerals. This study reports the sorption-desorption behavior of the environmentally hazardous industrial pollutants and certain pesticides degradation products, 3-chloroaniline, 3,4-dichloroaniline, 2,4,6-trichloroaniline, 4-chlorophenol, 2,4-dichlorophenol and 2,4,6-trichlorophenol on the reference clays kaolinite KGa-1 and Na-montmorillonite SWy-l. In batch studies, 2.0 g of clay were equilibrated with 100.0 mL solutions of each chemical at concentrations ranging from 10.0 to 200.0 mg/L. The uptake of the compounds was deduced from the results of HPLC-UV-Vis analysis. The lipophilic species were best retained by both clay materials. The most lipophilic chemical used in the study, 2,4,6-trichloroaniline, was also the most strongly retained, with sorption of up to 8 mg/g. In desorption experiments, which also relied on HPLC-UV-Vis technique, 2,4,6-trichloroaniline was the least desorbed from montmorillonite. However, on kaolinite all of the compounds under study were irreversibly retained. The experimental data have been modelled according to the Langmuir and Freundlich isotherms. A hypothesis is proposed concerning the sorption mechanism and potential applications of the findings in remediation strategies have been suggested. 相似文献
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《Atmospheric environment (Oxford, England : 1994)》2007,41(37):8228-8240
Isocyanatocyclohexane and isothiocyanatocyclohexane are becoming relevant compounds in urban and industrial air, as they are used in important amounts in automobile industry and building insulation, as well as in the manufacture of foams, rubber, paints and varnishes. Glass multi-sorbent tubes (Carbotrap, Carbopack, Carboxen) were connected to LCMA-UPC pump samplers for the retention of iso- and isothiocyanatocyclohexanes. The analysis was performed by automatic thermal desorption (ATD) coupled with capillary gas chromatography (GC)/mass spectrometry detector (MSD). TD-GC/MS was chosen as analytical method due to its versatility and the possibility of analysis of a wide range of volatility and polarity VOC in air samples. The method was satisfactory sensitive, selective and reproducible for the studied compounds. The concentrations of iso- and isothioisocyanatocyclohexanes were evaluated in different urban, residential and industrial locations from extensive VOC air quality and odour episode studies in several cities in the Northeastern edge of Spain. Around 200–300 VOC were determined qualitatively in each sample. Higher values of iso- and isothiocyanatocyclohexane were found in industrial areas than in urban or residential locations. The concentrations ranged between n.d.−246 and n.d.−29 μg m−3 for isocyanatocyclohexane and isothiocyanatocyclohexane, respectively, for industrial areas. On the other hand, urban and residential locations showed concentrations ranging between n.d.−164 and n.d.−29 μg m−3 for isocyanatocyclohexane and isothiocyanatocyclohexane, respectively. The site location (urban or industrial), the kind and nearness of possible iso- and isothiocyanatocyclohexane emission activities (industrial or building construction) and the changes of wind regimes throughout the year have been found the most important factors influencing the concentrations of these compounds in the different places. 相似文献
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PCDD and PCDF were found in urban air particulates from St. Louis and Washington, D.C., and in sediments from the Great Lakes and Siskiwit Lake, Isle Royale. The similarity between the PCDD and PCDF found in air particulates and sediment samples and the presence of PCDD and PCDF in sediment from Siskiwit Lake (a location which can receive only atmospheric inputs) suggest that these compounds are emitted to the atmosphere from combustion sources. The historical input of PCDD and PCDF to dated sediment cores shows a strong increase since 1940, and this suggests that the incineration of chlorinated organic compounds is an important source of PCDD and PCDF to the environment. 相似文献
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Chemical synthesis and physical properties of two mercapturic acids suggested as urinary metabolites of m- and p-xylenes ace described. These compounds may be used for the identification and quantivative determination by high-performance liquid chromatography of the corresponding mercapturic acids in urine. 相似文献
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