全文获取类型
收费全文 | 667篇 |
免费 | 7篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 27篇 |
废物处理 | 26篇 |
环保管理 | 60篇 |
综合类 | 82篇 |
基础理论 | 145篇 |
环境理论 | 4篇 |
污染及防治 | 113篇 |
评价与监测 | 45篇 |
社会与环境 | 173篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 7篇 |
2022年 | 34篇 |
2021年 | 24篇 |
2020年 | 10篇 |
2019年 | 19篇 |
2018年 | 37篇 |
2017年 | 28篇 |
2016年 | 63篇 |
2015年 | 22篇 |
2014年 | 60篇 |
2013年 | 78篇 |
2012年 | 44篇 |
2011年 | 39篇 |
2010年 | 49篇 |
2009年 | 46篇 |
2008年 | 22篇 |
2007年 | 29篇 |
2006年 | 17篇 |
2005年 | 22篇 |
2004年 | 5篇 |
2003年 | 3篇 |
2002年 | 1篇 |
2000年 | 7篇 |
1996年 | 4篇 |
1995年 | 1篇 |
1993年 | 1篇 |
1958年 | 3篇 |
1957年 | 1篇 |
1956年 | 1篇 |
排序方式: 共有677条查询结果,搜索用时 515 毫秒
181.
Yu. I. Mel’nikov 《Russian Journal of Ecology》2014,45(1):54-61
The results of long-term studies (1973–1982) have been used to analyze specific features in the distribution of larid bird colonies in the Selenga River delta over an 11-year climate cycle. It has been shown that the spatial distribution of these birds has distinct patterns in years with different water levels (high, medium, or low) in the delta and is based on preference for certain nesting biotopes, which is well manifested in all species studied and depends on their ecological niches. The main factors determining the distribution of birds over the study area include water level, terrain topography, and locations of major aggregations of food organisms. 相似文献
182.
Mickael Cregut Sulivan Jouanneau François Brillet Marie-José Durand Cyril Sweetlove Jean-Charles Chenèble Jacques L’Haridon Gérald Thouand 《Environmental science and pollution research international》2014,21(16):9545-9552
The society demands safer products with a better ecological profile. Regulatory criteria have been developed to prevent risks for human health and the environment, for example, within the framework of the European regulation REACH (Regulation (EC) No 1907, 2006). This has driven industry to consider the development of high throughput screening methodologies for assessing chemical biodegradability. These new screening methodologies must be scalable for miniaturisation, reproducible and as reliable as existing procedures for enhanced biodegradability assessment. Here, we evaluate two alternative systems that can be scaled for high throughput screening and conveniently miniaturised to limit costs in comparison with traditional testing. These systems are based on two dyes as follows: an invasive fluorescent dyes that serves as a cellular activity marker (a resazurin-like dye reagent) and a noninvasive fluorescent oxygen optosensor dye (an optical sensor). The advantages and limitations of these platforms for biodegradability assessment are presented. Our results confirm the feasibility of these systems for evaluating and screening chemicals for ready biodegradability. The optosensor is a miniaturised version of a component already used in traditional ready biodegradability testing, whereas the resazurin dye offers an interesting new screening mechanism for chemical concentrations greater than 10 mg/l that are not amenable to traditional closed bottle tests. The use of these approaches allows generalisation of high throughput screening methodologies to meet the need of developing new compounds with a favourable ecological profile and also assessment for regulatory purpose. 相似文献
183.
D'Emilio M Chianese D Coppola R Macchiato M Ragosta M 《Environmental monitoring and assessment》2007,125(1-3):137-146
In the framework of the development of new methods for measuring and monitoring soil pollution, this paper deals with the
use of magnetic methodologies to monitor the heavy metals presence in soils. In particular it shows a procedure for collecting
magnetic susceptibility measurements in order to interpret them as proxy variable for monitoring heavy metals in soils. Magnetic
measurements are carried out using a magnetic susceptibility meter with two different probes for in situ field surveys. The
experimental procedure is divided in two parts. In the first part we carry out laboratory tests aimed to evaluate, for both
the probes, the effective investigation depth for soil, the measurement reproducibility under different conditions, and the
influence of water content. We complete this part comparing in situ measurements obtained by means of two probes with different
characteristics. In the second part we carry out tests to evaluate the relationships between heavy metal levels and magnetic
susceptibility values of soil samples. We investigate the variability of the magnetic susceptibility measurements contaminating
different soil samples with well known concentration of heavy metals. Moreover we study the correlation between magnetic susceptibility
values and metal concentrations, determined by means of AAS, in soil samples collected during a field survey. Results suggest
that a careful check of the experimental procedure play a crucial role for using magnetic susceptibility measurements for
heavy metals in situ monitoring. This is very helpful both for improving the quality of data and for making simpler data interpretation. 相似文献
184.
An assessment of heavy metals loading in River Benue in the Makurdi Metropolitan Area in Central Nigeria 总被引:1,自引:0,他引:1
River Benue, the second largest river in Nigeria, serves as the major source of municipal water supplies for towns and villages
along its course. Water samples from the river were collected at ten stations in the Makurdi metropolitan area (7°44′ N, 8°32′ E) in Benue State, Central Nigeria, for 12 months and analyzed for their heavy metals concentration, along with other water-quality
parameters such as turbidity, pH, total dissolved solids and total solids. The results revealed that the mean concentrations
of heavy metals in the river was in the following ascending order, Cd < Cu < Zn < Mn < Pb < Cr < Fe. The levels of most of
the parameters determined, with the exception of Cd, Cr and Pb were, generally, within acceptable limits for drinking water.
From the present study, it is concluded that the River Benue is only moderately contaminated with regard to heavy metals,
in the Makurdi metropolitan area. 相似文献
185.
Mariagrazia D’Emilio Rosa Caggiano Rosa Coppola Maria Macchiato Maria Ragosta 《Environmental monitoring and assessment》2010,169(1-4):619-630
The development of in situ, cheep, noninvasive, and fast strategies for soil monitoring is a crucial task for environmental research. In this paper, we present the results of three field surveys carried out in an industrial area of Southern Italy: S. Nicola di Melfi. The monitoring procedure is based on soil magnetic susceptibility measurements carried out by means of experimental protocols that our research group developed during the last years. This field surveys is supported by both geological characterization of the area and analytical determinations of metal concentrations in soils. Magnetic studies were carried out not only in situ but also in laboratory. Results show that, taking into account the influence due to the geomorphologic difference, soil magnetic susceptibility is an optimal indicator of the anthropogenic impact. So, our monitoring strategy discloses that the combined use of magnetic susceptibility measurements and soil geomorphology information may be used as a useful tool for the temporal monitoring of pollution evolution and for a fast screening of polluted zones. 相似文献
186.
Lijin Lin Jun Shi Qihua Liu Ming’an Liao Luoyin Mei 《Environmental monitoring and assessment》2014,186(7):4051-4056
In a preliminary study, we found that the cadmium (Cd) concentrations in shoots of the winter farmland weeds Cardamine hirsuta Linn. and Gnaphalium affine D. Don exceeded the critical value of a Cd-hyperaccumulator (100 mg kg?1), indicating that these two farmland weeds might be Cd-hyperaccumulators. In this study, we grew these species in soil containing various concentrations of Cd to further evaluate their Cd accumulation characteristics. The biomasses of C. hirsuta and G. affine decreased with increasing Cd concentrations in the soil, while the root/shoot ratio and the Cd concentrations in shoot tissues increased. The Cd concentrations in shoots of C. hirsuta and G. affine reached 121.96 and 143.91 mg kg?1, respectively, at the soil Cd concentration of 50 mg kg?1. Both of these concentrations exceeded the critical value of a Cd-hyperaccumulator (100 mg kg?1). The shoot bioconcentration factors of C. hirsuta and G. affine were greater than 1. The translocation factor of C. hirsuta was less than 1 and that of G. affine was greater than 1. These findings indicated that C. hirsuta is a Cd-accumulator and G. affine is Cd-hyperaccumulator. Both plants are distributed widely in the field, and they could be used to remediate Cd-contaminated farmland soil in winter. 相似文献
187.
Rajiv Ganguly Brian M. Broderick Roland O’Donoghue 《Environmental Modeling and Assessment》2009,14(1):113-125
A comparative evaluation of two Gaussian-based line source models namely, California line source dispersion model version
4 and the general finite line source model, is presented. The concentrations predicted by these models are compared with background-corrected
ambient concentrations measured at three different distances from a motorway and performance of both models assessed in the
context of integrated transport–environment modelling for regulatory purposes. 相似文献
188.
Soil heavy metal contamination in an industrial area: analysis of the data collected during a decade 总被引:1,自引:0,他引:1
Mariagrazia D’Emilio Rosa Caggiano Maria Macchiato Maria Ragosta Serena Sabia 《Environmental monitoring and assessment》2013,185(7):5951-5964
Soil contamination by heavy metals has become a serious problem mainly because, above certain concentrations, all metals have adverse effects on human health. In particular, the accumulation of heavy metals in agricultural soils leads to elevated uptake by crops and affects food quality and safety. In this paper, we present the results of a study carried out over a decade for evaluating the impact of a new industrial settlement in an area geared to agriculture and livestock and far from urban sites. We focus our study on the bioavailable fraction of Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn in soil samples. Heavy metal concentrations in soil are analysed with both univariate and multivariate statistical procedures. The main goal of this paper is the development of a statistical procedure, based on a mix of multivariate analysis, able to compare field surveys carried out during different years and to characterize spatial and temporal changes in soil heavy metals concentrations. 相似文献
189.
D'Alessandro W Bellomo S Parello F Brusca L Longo M 《Environmental monitoring and assessment》2008,145(1-3):303-313
Six hundred and sixty-seven water samples were collected from public drinking water supplies in Sicily and analysed for electric conductivity and for their Cl(-), Br(-) and F(-) contents. The samples were, as far as possible, collected evenly over the entire territory with an average sampling density of about one sample for every 7,600 inhabitants. The contents of Cl(-) and Br(-), ranging between 5.53 and 1,302 mg/l and between <0.025 and 4.76 mg/l respectively, correlated well with the electric conductivity, a parameter used as a proxy for water salinity. The highest values were found both along the NW and SE coasts, which we attributed to seawater contamination, and in the central part of Sicily, which we attributed to evaporitic rock dissolution. The fluoride concentrations ranged from 0.023 to 3.28 mg/l, while the highest values (only three exceeding the maximum admissible concentration of 1.5 mg/l) generally correlated either with the presence in the area of crystalline (volcanic or metamorphic) or evaporitic rocks or with contamination from hydrothermal activity. Apart from these limited cases of exceeding F(-) levels, the waters of public drinking water supplies in Sicily can be considered safe for human consumption for the analysed parameters. Some limited concern could arise from the intake of bromide-rich waters (about 3% exceeding 1 mg/l) because of the potential formation of dangerous disinfection by-products. 相似文献
190.
Catalan L Liang V Johnson A Jia C O'Connor B Walton C 《Environmental monitoring and assessment》2009,156(1-4):37-49
Emissions of reduced sulphur compounds (RSCs) from the primary and secondary clarifiers at a Kraft mill were measured for respectively 8 and 22 days using a floating flux chamber. In the primary clarifier, dimethyl disulphide (DMDS) had the highest mean flux (0.83 microg s(-1) m(-2)) among all RSCs, and the mean flux of total reduced sulphur (TRS) was 1.53 microg s(-1) m(-2). At the secondary clarifier, dimethyl sulphide (DMS) had the highest mean flux (0.024 microg s(-1) m(-2)), and the mean flux of total reduced sulphur (TRS) was 0.025 microg s(-1) m(-2). Large variations in fluxes as a function of sampling date were observed in both clarifiers. Emission fluxes of DMS from the secondary clarifier were correlated with temperature in the flux chamber and with the biological and chemical oxygen demands (BOD and COD) of the wastewater. Emission rates of RSCs from the clarifiers were found to be insignificant by comparison with other mill sources. 相似文献