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971.
Organobentonites as adsorbents for some organic pollutants and its application in wastewater treatment 总被引:4,自引:0,他引:4
Organobentonitesasadsorbentsforsomeorganicpollutantsanditsapplicationinwastewatertreatment¥ZhuLizhong;ZhangJianying;LiYimin;S... 相似文献
972.
硫氰酸钠,二甲基甲酰胺,乙腈和丙烯腈是化工生产中排放的有毒有害污染物,会造成水生生物的急性死亡和慢性中毒,破坏水生态系统的生物多样性和功能。为保护水生态系统,需研究这些污染物对水生物的毒性效应,制定其在水中的允许浓度和排旷标准。本文研究了这四种污染物大型蚤的急性和慢性毒性效应,结果表明硫氰酸钠,二甲基甲酰胺,乙腈和丙烯腈对大型蚤的急性毒性值(48h=EC50)分别为4.22mg/L,3561mg/ 相似文献
973.
The concentrations of criteria air pollutants such as CO, NOx (NO + NO2), SO2 and PM were measured in the period of May 2001 and April 2003 in the city of Bursa, Turkey. The average concentrations for
this period were 1115±1600 μg/m3, 29±50 μg/m3, 51±24 μg/m3, 79±65 μg/m3, 40±35 μg/m3, 98±220 μg/m3, for CO, NO, NO2, NOx, SO2 and PM, respectively. Temporal changes in concentrations were analyzed using meteorological factors. Correlations among pollutant
concentrations and meteorological parameters showed weak relations nearly in all data. Lower concentrations were observed
in the summer months while higher concentrations were measured in the winter months. The increase in winter concentrations
was probably due to residential heating. Pollutants were associated with each other in order to have information about their
origin. NOx/SO2 ratio was also examined to bring out the source origin contributing on air pollution (i.e., traffic or stationary). 相似文献
974.
鉴于持久性有机物在环境中的结合和承载机制,作者认为,对于持久性有机物,环境可以抽象为气相、水相、有机碳相和脂相等四个均质、同结合作用的环境相,为描述持久性有机物在环境相间的平衡分配行为,引入了“泛逸度”的概念,建立了环境相间相平衡酌泛逸度模型,并以DDT为例尝试了模型的应用。 相似文献
975.
D. S. Cherry R. K. Guthrie R.S. Harvey 《Journal of the American Water Resources Association》1974,10(5):1009-1016
ABSTRACT: Bacterial populations in a fast flowing stream receiving chemical wastes and in a slower flowing pond receiving a thermal addition 3–5°C above ambient temperature were compared with populations in a nonpolluted converging stream and an adjacent unheated pond. Parameters measured were total aerobic heterotrophic bacteria, bacterial diversity, percent chromagens of the total bacterial populations, and water temperature. Analyses of monthly samples plated on dilute Standard Plate Count Agar indicated that chemical additives to the waste stream significantly decreased the percent of chromagenic bacteria, and that thermal stress significantly altered total counts and bacterial diversity in the flowing pond. The effects of potential pollutants on these aquatic systems were assessed and are discussed on the basis of results obtained over a 16-month period. 相似文献
976.
Recovery of lotic periphyton communities after disturbance 总被引:2,自引:0,他引:2
Periphyton communities represent potentially excellent candidates for assessing the recovery of lotic ecosystems after disturbance.
These communities are ubiquitous, relatively easy to sample and measure (in terms of total community biomass), have short
generation times, and may influence the recovery rates of higher trophic levels. The first section of this article analyzes
how site availability, species availability, and differential species performance influence periphyton successional dynamics.
This background information provides a foundation for understanding how periphytic organisms respond after a disturbance.
The second section of this article analyzes how periphyton communities respond to four different types of disturbance (flood
events, desiccation, organic nutrient enrichment, and toxic metal exposure). Although data are limited, it is concluded that
the fast growth rates and short generation times of periphytic organisms, coupled with their flexible life history strategies
and good dispersal ability, allow lotic periphyton communities to recover relatively quickly after a disturbance. In addition,
disturbance type and severity, local environmental conditions, and site-specific factors also will influence recovery rates.
Future research needs include a better understanding of: (1) what periphyton property(ies) would serve as the best index of
recovery; (2) whether or not the robustness of this index varies among different environments and different disturbances;
(3) interactions between autotrophs and heterotrophs within the periphyton mat, particularly with respect to nutrient cycling;
(4) competitive interactions among organisms; (5) functional redundancy of organisms; and (6) the influence of the riparian
zone and channel geomorphology on periphyton recovery rates. 相似文献
977.
978.
979.
Khoroshko LO Petrova VN Viktorovskii IV Lahtiperä M Sinkkonen S Paasivirta J 《Environmental science and pollution research international》2005,12(1):8-9
- A previously unknown pollutant in river water was identified to be 2-mercaptobenzothiazole (2-MBT) by interpretation and simulation of its GC/LRMS spectrum. Further GC/HRMS measurement of the isotope composition of the molecular ion verified this structure. 2-MBT is a well-known agent for corrosion inhibition and a stable metabolite of several other benzothiazoles. The present 2-MBT trace was most probably a metabolite of the wood preservative TCMTB which leaked from an upstream sawmill. The metabolite had been detected earlier in urine of the sawmill workers, but now was identified in the recipient water environment for the first time. 相似文献
980.
Ongoing deliberations on the regulation of semivolatile organic chemicals require the assessment of chemical transport in atmospheric and marine systems. The characteristic travel distance was proposed as a measure for the transport potential in air and water. However, the existing definition treats the transport processes separately. It is shown that combined transport in coupled air-ocean systems can accelerate the overall transport into remote regions. Concentration ratios in air and water change with distance from sources depending on the initial concentration ratio and on the difference between the transport velocities. A measure is suggested facilitating the chemical screening with respect to transport potentials in such air-ocean systems. A case study for alpha and gamma-hexachlorocyclohexane shows that the suggested measure qualitatively reveals the transport potentials of these chemicals and exemplifies possible concentration patterns. 相似文献