首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   147篇
  完全免费   29篇
  评价与监测   176篇
  2018年   5篇
  2017年   6篇
  2016年   3篇
  2015年   4篇
  2014年   3篇
  2013年   4篇
  2012年   4篇
  2011年   16篇
  2010年   5篇
  2008年   18篇
  2007年   12篇
  2006年   24篇
  2005年   15篇
  2004年   3篇
  2003年   11篇
  2002年   13篇
  2001年   6篇
  2000年   6篇
  1999年   6篇
  1998年   8篇
  1997年   3篇
  1995年   1篇
排序方式: 共有176条查询结果,搜索用时 46 毫秒
1.
通过对北京市通州污灌区土壤现状调查与蔬菜重金属污染监测,结合土壤环境质量标准、食品卫生标准及污灌区污染历史,分析对比该区土壤和蔬菜重金属污染状况及其变化。结果表明,本次监测通州污灌区土壤中重金属平均含量均达到土壤环境质量标准(GB15618-1995)中二级标准限量。对照土壤中的重金属Cu、Pb、Cr、Cd和As均达到土壤一级标准。凉水河两岸和通惠北干渠中重金属含量均高于对照土壤,说明污灌区污水灌溉已使土壤受到一定程度的污染。与二十世纪70年代末监测结果相比,土壤中多数重金属含量处于上升趋势。污灌区蔬菜重金属含量监测结果表明,其含量水平均达到食品卫生标准,说明污灌区蔬菜尚未受到严重污染。  相似文献
2.
石油勘探开发中的石油类污染及其监测分析技术   总被引:16,自引:2,他引:14  
首先介绍了陆地石油勘探开发过程对环境的影响 ,并总结出这种影响集中体现在油田附近水体和土壤受到石油类的污染。然后针对石油类监测分析方法展开探讨 ,并分水中石油类和土壤中石油类两部分 ,把我国和美国的监测方法进行了对比研究。在此基础上提出了在进行油田环境现状评价和石油类污染物环境变迁规律研究中使用石油类分析方法的建议  相似文献
3.
土壤中石油类有机污染物检测方法研究进展   总被引:9,自引:0,他引:9  
在系统地归纳总结了国内外研究者所采用的各种分析方法基础上,指出了现有实验分析中存在的问题及发展趋势。主张尽量使用和开发仪器分析检测方法,并建议尽快规范土壤中石油类有机污染物的定性定量分析方法,尽早解决目前常用分析方法中存在的各种问题,为土壤石油污染防治提供有效保障。  相似文献
4.
垃圾填埋场渗出液中有害成分的研究   总被引:9,自引:0,他引:9  
研究垃圾填埋场渗出液中的有害成分。渗出液样品用适当的方法处理后 ,用气相色谱 -质谱联用方法和原子发射光谱法进行定性分析。然后用原子吸收分光光度法和反相高效液相色谱法定量测定样品中微量的 Cu、Zn、Pb、Cr、Cd、Hg、苯酚、对甲苯酚、萘、蒽  相似文献
5.
A knowledge of the total content of trace metals is not enoughto fully assess the environmental impact of polluted soils. Forthis reason, the determination of metal species in solution isimportant to evaluate their behaviour in the environment andtheir mobilization capacity. Sequential extraction procedure wasused to speciate five heavy metals (Cd, Pb, Cu, Ni and Zn) fromfour contaminated soils of Southern Nigeria into sixoperationally defined geochemical species: water soluble,enchangeable, carbonates, Fe-Mn oxide, organic and residual.Metal recoveries were within ± 10% of the independentlydetermined total Cd, Pb, Cu, Ni and Zn concentrations. The highest amount of Cd (avg. 30%) in the nonresidual fractionswas found in the exchangeable fraction, while Cu and Zn weresignificantly associated with the organic fraction. Thecarbonate fraction contained on average 14, 18.6, 12.6, 13 and11% and the residual fraction contained on average 47, 18, 33,50 and 25% of Cd, Pb, Cu, Ni and Zn respectively. Assuming thatmobility and bioavailability of these metals are related to thesolubility of the geochemical form of the metals, and that theydecrease in the order of extraction sequence, the apparentmobility and potential bioavailability for these five metals inthe soil were: Pb > Zn > Cu > Ni > Cd. The mobility indexes ofcopper and nickel correlated positively and significantly withthe total content of metals, while mobility indexes of cadmiumand zinc correlated negatively and significantly with the totalcontent of metals.  相似文献
6.
河南省主要城市饮用水源水中多环芳烃污染状况的研究   总被引:8,自引:0,他引:8  
对河南省主要城市饮用水源水中多环芳烃的污染状况进行了初步研究 ,结果表明 ,河南省主要城市饮用水源水普遍受到多环芳烃的污染 ,主要污染因子为萘、蒽、菲、芘、荧蒽、芴以及强致癌性物质苯并 (a)芘 ,而且苯并 (a)芘有超标情况出现  相似文献
7.
中国污染场地修复的研究进展 、 问题与展望   总被引:7,自引:0,他引:7       下载免费PDF全文
随着城市化和产业转移进程的加快,我国城镇工业企业搬迁或遗留的污染场地数量与日俱增,亟须开展污染场地治理与修复工作,以保障人居环境安全、国民健康和社会稳定。综述了我国污染场地及其产生、状态和风险,污染场地管理、修复技术及工程实践进展,污染场地管理和修复的主要问题,场地污染防治与修复政策、技术和融资机制需求,旨在推进污染场地环境管理与修复产业化发展。  相似文献
8.
Heavy Metal Load Of Soil, Water And Vegetables In Peri-Urban Delhi   总被引:5,自引:0,他引:5  
Peri-urban lands are often used for production of vegetables for better market accessibility and higher prices. But most of these lands are contaminated with heavy metals through industrial effluents, sewage and sludge, and vehicular emission. Vegetables grown in such lands, therefore, are likely to be contaminated with heavy metals and unsafe for consumption. Samples of vegetables i.e., spinach (Spinacia oleracea L.) and okra (Abelmoschus esculentus L.); soil and irrigation water were collected from 5 peri-urban sites of New Delhi to monitor their heavy metal loads. While heavy metal load of the soils were below the maximum allowable limit prescribed by the World Health Organization (WHO), it was higher in irrigation water and vegetable samples. The spinach and okra samples showed Zn, Pb and Cd levels higher than the WHO limits. The levels of Cu, however, were at their safe limits. Metal contamination was higher in spinach than in okra. Spatial variability of metal contamination was also observed in the study. Bio-availability of metals present in soil showed a positive relationship with their total content and organic matter content of soil but no relationship was observed with soil pH. Washing of vegetables with clean water was a very effective and easy way of decontaminating the metal pollution as it reduced the contamination by 75 to 100%.  相似文献
9.
Leachate and groundwater samples were collected from Gazipur landfill-site and its adjacent area to study the possible impact of leachate percolation on groundwater quality. Concentration of various physico-chemical parameters including heavy metal (Cd, Cr, Cu, Fe, Ni, Pb and Zn) and microbiological parameters (total coliform (TC) and faecal coliform (FC)) were determined in groundwater and leachate samples. The moderately high concentrations of Cl, NO 3, SO2− 4, NH+ 4, Phenol, Fe, Zn and COD in groundwater, likely indicate that groundwater quality is being significantly affected by leachate percolation. Further they proved to be as tracers for groundwater contamination. The effect of depth and distance of the well from the pollution source was also investigated. The presence of TC and FC in groundwater warns for the groundwater quality and thus renders the associated aquifer unreliable for domestic water supply and other uses. Although some remedial measures are suggested to reduce further groundwater contamination via leachate percolation, the present study demand for the proper management of waste in Delhi.  相似文献
10.
葫芦岛市近岸海域水生动物重金属污染状况的监测   总被引:4,自引:0,他引:4  
参考国内外有关生物残毒研究理论 ,对葫芦岛市沿岸海区 ,包括东起笊笠码头 ,西至绥中芷锚湾海滨海水中现存动物体重金属污染状况进行监测和评价。  相似文献
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号