全文获取类型
收费全文 | 483篇 |
免费 | 2篇 |
国内免费 | 18篇 |
专业分类
安全科学 | 9篇 |
废物处理 | 2篇 |
环保管理 | 106篇 |
综合类 | 94篇 |
基础理论 | 43篇 |
污染及防治 | 165篇 |
评价与监测 | 62篇 |
社会与环境 | 18篇 |
灾害及防治 | 4篇 |
出版年
2024年 | 1篇 |
2023年 | 8篇 |
2022年 | 9篇 |
2021年 | 7篇 |
2020年 | 14篇 |
2019年 | 7篇 |
2018年 | 6篇 |
2017年 | 7篇 |
2016年 | 14篇 |
2015年 | 17篇 |
2014年 | 11篇 |
2013年 | 25篇 |
2012年 | 10篇 |
2011年 | 36篇 |
2010年 | 18篇 |
2009年 | 42篇 |
2008年 | 55篇 |
2007年 | 36篇 |
2006年 | 21篇 |
2005年 | 14篇 |
2004年 | 15篇 |
2003年 | 19篇 |
2002年 | 13篇 |
2001年 | 18篇 |
2000年 | 18篇 |
1999年 | 6篇 |
1998年 | 13篇 |
1997年 | 11篇 |
1996年 | 6篇 |
1995年 | 3篇 |
1994年 | 5篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1988年 | 4篇 |
1987年 | 1篇 |
1983年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有503条查询结果,搜索用时 15 毫秒
201.
Location matters for the value of capital assets. The value of changes in natural capital wealth can depend on whether natural capital asset prices are measured locally and then aggregated or whether average values are applied over aggregate representative areas. Spatial heterogeneity of resource characteristics and institutions impact approximations of the intertemporal welfare function and accounting price function because when spatial aggregation precedes valuation it implies greater arbitrage opportunities leading to more inelastic shadow (accounting) price functions than when valuation is done locally and then aggregated. Aggregation of observed values across varying resource and institutional characteristics can lead to omitted variables bias. We illustrate these results in the context of groundwater in the Kansas High Plains Aquifer and demonstrate that the accounting price function is less elastic when the accounting price is measured locally. Failure to measure locally and then aggregate could lead to undervaluing scarce resources and overvaluing plentiful ones, which biases wealth accounts in favor of passing the non-declining wealth sustainability test. 相似文献
202.
Zhengqing Cai Xiao Zhao Jun Duan Dongye Zhao Zhi Dang Zhang Lin 《Frontiers of Environmental Science & Engineering》2020,14(5):84
203.
以先进的地理信息系统软件为平台,结合遵义市地下水资源的特点与水资源管理的实际情况以及未来发展趋势,提出了遵义市地下水资源地理信息系统设计与开发的总体构想。 相似文献
204.
依据相关的地下水质量标准.对研究区采集的不同监测井的地下水样品进行了评价。结果表明.9个监测井的总锰.氨氮.凯氮和高锰酸盐指数全部超标.各个指标的最大超标倍数及监测井号依次为8.44(6#总锰).70.5(5#氨氮).8.8(5#凯氮)和2.27(7#高锰酸盐指数)。另外.比较2002年和2000年2年的监测数据可见.对比的井位1#~7#中的高锰酸盐指数有不同程度的增大.BOD5则有大幅减少:而1#和2#中的氨氮.凯氮均有较大幅度的减小(氨氮分别减少7.21mg/L、7.32mg/L.凯氮分别减少17.57mg/L、5.28mg/L):综合污染指数P在监测井1#、2#、4#、6#和7#均有明显的减小。反映其污染程度减轻。 相似文献
205.
206.
《环境科学学报(英文版)》2023,35(3):453-469
Approximately 94 to 220 million people worldwide are at risk of drinking well water containing arsenic > 10 µg/L, the WHO guideline value. To identify non-compliant domestic wells, assess health risks and reduce exposure, accurate and rapid on-site inorganic arsenic screening methods are desirable because all domestic wells worldwide need to be tested. Here, the principles, advantages and limitations of commonly used colorimetry, electrochemistry, and biosensing methods are critically reviewed, with the performance compared with laboratory-based benchmark methods. Most commercial kits are based on the classic Gutzeit reaction. Despite being semi-quantitative, the more recent and more expensive products display improved and acceptable accuracy and shorter testing time (∼10 min). Carried out by trained professionals, electrochemical methods are also feasible for on-site analysis, although miniaturization is desirable yet challenging. Biosensing using whole bacterial cells or bio-engineered materials such as aptamers is promising, if incorporated with function specific nanomaterials and biomaterials. Since arsenic is frequently found as arsenite in reducing groundwater and subject to oxidation during sampling, transportation and storage, on-site separation and sample preservation are feasible but the specific methods should be chosen based on sample matrix and tested before use. To eliminate arsenic exposure among hundreds of millions of mostly rural residents worldwide, we call for concerted efforts in research community and regulatory authority to develop accurate, rapid, and affordable tests for on-site screening and monitoring of arsenic in drinking water. Access to affordable testing will benefit people who are socioeconomically disadvantaged. 相似文献
207.
Quantification of groundwater contamination in an urban area using integral pumping tests 总被引:1,自引:0,他引:1
Bauer S Bayer-Raich M Holder T Kolesar C Müller D Ptak T 《Journal of contaminant hydrology》2004,75(3-4):183-213
In this paper, the integral groundwater investigation method is used for the quantification of PCE and TCE mass flow rates at an industrialized urban area in Linz, Austria. In this approach, pumping wells positioned along control planes perpendicular to the groundwater flow direction are operated for a time period on the order of days and sampled for contaminants. The concentration time series of the contaminants measured during operation of the pumping wells are then used to determine contaminant mass flow rates, mean concentrations and the plume shapes and positions at the control planes. The three control planes used in Linz were positioned downstream of a number of potential source zones, which are distributed over the field site. By use of the integral investigation method, it was possible to identify active contaminant sources, quantify the individual source strength in terms of mass flow rates at the control planes and estimate the contaminant plume position relative to the control planes. The source zones emitting the highest PCE and TCE mass flow rates could be determined, representing the areas where additional investigation and remediation activities will be needed. Additionally, large parts of the area investigated could be excluded from further investigation and remediation activities. 相似文献
208.
Occurrence and attenuation of specific organic compounds in the groundwater plume at a former gasworks site 总被引:1,自引:0,他引:1
The changing contaminant pattern with travelled distance was investigated in the anaerobic groundwater plume downstream from an extended zone containing residual NAPL at a former gas manufacturing plant. With increasing distance, O- and N-heterocyclic aromatic compounds are enriched in the plume relative to the usually assessed coal tar constituents (poly- and monocyclic aromatic compounds). In a first approximation, the overall concentration decrease of the investigated compounds follows a first order overall decay. The half life distance in the plume downgradient from the source varied between 20 m for benzene and up to 167-303 m for alkyl-naphthalenes. Acenaphthene is degraded only within about 50 m downstream from the source area, then its concentration remains constant (ca. 180 microg/l) and far above the legal limit. Dimethyl-benzofurans were the most recalcitrant among all compounds which could be quantified with the analytical method available. The overall groundwater contamination in the plume is seriously underestimated if only BTEX and 16-EPA-PAHs are monitored. 相似文献
209.
Mohammed Shahid Akhlaq 《Environmental science and pollution research international》1997,4(4):217-222
A two-step analytical method is developed for the isolation and characterization of polycyclic aromatic hydrocarbons (PAHs)
in crude oil contaminated soil. In the first step, those crude oil components were isolated which are easily mobilized with
water from the contaminated soil (determination of groundwater pollution potential). In the second step, the fraction containing
the remaining crude oil compounds was extracted using toluene. After the cleanup of the fractions, both fractions were analyzed
using high-performance liquid chromatography (HPLC).
The HPLC of the toluene extracted fraction shows that along with the sixteen priority pollutants from the US-EPA list, many
other polycyclic aromatic hydrocarbons (PAHs) are present as well. It is evident from the chromatograms that a significant
amount of PAHs are present as is also the case in the fractions eluted by water.
The described method allows the determination of total organic pollutants from crude oil, some of them being potential groundwater
contaminants. The major part of the total pollutants could not be mobilized by water and therefore remains in the soil, which
was extracted in the second step. 相似文献
210.
Integrated Use of GLEAMS and GIS to Prevent Groundwater Pollution Caused by Agricultural Disposal of Animal Waste 总被引:1,自引:0,他引:1
Monica Garnier Antonio Lo Porto Renzo Marini Antonio Leone 《Environmental management》1998,22(5):747-756
/ In modern intensive animal farming the disposal of a large amount of waste is of great concern, as, if not properly performed, it can cause the pollution of water, mainly because of the high content of nitrate and phosphate. This paper presents the results of a study intended to assess the environmental sustainability of animal waste disposal on agricultural soils in the alluvial plain of the River Chiana (Tuscany, Italy), a particularly sensitive area because of the high vulnerability of the shallow aquifer and of the intensive agricultural and breeding activities. With this aim, a strategy has been employed, that consists of the integrated use of a management model and GISs. The consequences on groundwater of applying animal waste to different kind of soils and crop arrangements have been simulated by means of the management model GLEAMS (Groundwater Loading Effects of Agricultural Management Systems, ver 2.01). As the huge amount of data required by such a sophisticated model does not allow applications at a scale larger than the field size, IDRISI and GRASS GIS packages have been used to divide the study area into land units, with homogeneous environmental characteristics, and then to generalize on these units the outputs of the model. The main conclusions can be synthesized as follows: The amount of animal waste produced in some of the investigated areas (i.e., municipal territory) is greater than that disposable on their own agricultural soil with no risks to the groundwater; consequently a cooperative approach among municipalities is necessary in order to plan waste disposal in a comprehensive and centralized way.KEY WORDS: Land use; Animal waste disposal; Groundwater protection; GIS, Management models 相似文献