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排序方式: 共有67条查询结果,搜索用时 78 毫秒
41.
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Olatunde S. Olatunji Olalekan S. Fatoki Beatrice O. Opeolu Bhekumusa J. Ximba Rumbidzai Chitongo 《Environmental monitoring and assessment》2017,189(7):363
In this study, a method for the simultaneous determination of two steroid hormones, 17β-estradiol (E2) and estriol (E3), and a hormone mimicking polycarbonate, bisphenol-A (BPA), was developed and validated. This was thereafter used for the determination of the levels of the hormones in surface water collected around some livestock farms. The sensitivity of the method allowed the LODs and LOQs of the hormones and mimic hormone in the range 1.14–2.510 and 3.42–7.53 μg/L, respectively. The results revealed wide variability in the concentrations of E2 and E3, while BPA was not detected at any of the sampling stations. The concentration of E3 ranged between <1.14 and 45.5 μg/L (N = 120) in station 2 water. The highest concentration of E2 (15.7 μg/L, N = 80) was observed in water from station 1. The varied concentrations may be connected with the nature and sources of release, inconsistencies in analyte distribution due to dynamics of water flow pattern and the physical/chemical properties of the receiving water bodies. 相似文献
43.
Effects of nitrogen and oxygen on biofilter performance 总被引:2,自引:0,他引:2
Yang H Minuth B Allen DG 《Journal of the Air & Waste Management Association (1995)》2002,52(3):279-286
Three laboratory-scale biofilters packed with inert material were used to study the nitrogen and oxygen requirements for biofiltration of methanol. Mixtures of methanol with inorganic nitrogen (NH3 or NO3) at nitrogen-to-carbon (N:C) ratios ranging from 0.015 to 0.4 were employed to reveal nitrogen effects on biofiltration. In the oxygen study, mixtures of air and oxygen at different oxygen contents were used. At low nitrogen levels, the removal rate increased with increasing N:C ratio for both NH3 and NO3. However, at high concentrations, NH3 had an inhibitory effect on biodegradation while the removal rate reached a plateau at high NO3 concentrations. Biofiltration with 63% oxygen in the inlet gas stream increased the maximum removal rate from 120 to 145 g/m3/hr after 3 days in comparison with biofiltration with air. However, a further increase in oxygen content up to 80% did not lead to a further improvement in biofilter performance, suggesting that both oxygen and biofilm thickness can be the relevant factors limiting biofilter performance and creating the plateau in removal rates at high loadings. 相似文献
44.
Beatrice B. Lackaff Bruce J. Hunt Ian E. Von Essen 《Journal of the American Water Resources Association》1993,29(6):949-955
ABSTRACT: U.S. Environmental Protection Agency (EPA) statutes require identification of all potential sources of contamination within a wellhead protection area. All wells over Spokane County's aquifer are included in one wellhead protection zone called the Aquifer Sensitive Area (ASA). A GIS-based Contaminant Source Inventory (CSI) was developed for the ASA. Datasets listing businesses and agencies within the ASA were imported into the GIS from state, county, city, and local agencies. These datasets were selected, joined, and sorted using GIS relational database capabilities into one ASA “business master file.” Map files were projected and transformed into common coordinates. Next, business sites within the master file were spatially related by address to the digital map files. Likely Critical Materials Users (CMU) were identified by sorting on selected standard Industrial Codes (SIC). Additional files of CMUs were imported into the Contaminant Source Inventory. GIS queries were performed to locate specific materials, quantities, and storage facilities, and to analyze CMU activity within selected buffer zones. This project demonstrated the usefulness of GIS technology in the development, management, maintenance, and analysis of vast quantities of data associated with a local wellhead protection pro. gram. 相似文献
45.
Conti ME Finoia MG Bocca B Mele G Alimonti A Pino A 《Environmental monitoring and assessment》2012,184(1):527-538
Lichen, Usnea barbata, transplants taken from Tierra del Fuego (south Patagonia, Argentina) were tested as potential biomonitors of atmospheric
airborne deposition in an apparently pristine environment. In 2005, lichens were sampled in a reference site (n = 31) and transplanted in the northern Region of Tierra del Fuego. After, respectively, 1 month and 1 year of exposure, we
collected them. The aim of the study was to determine the bioaccumulation of 26 elements in order to evaluate the background
levels in the selected area. Samples were analyzed by the sector field inductively coupled plasma mass spectrometry. Discriminant
analysis on principal component analysis factors was applied in order to explore the relationship among the different elements
as far as time and spatial variation in transplants regards. The analysis was tested by Monte Carlo test based on 999 replicates.
The most important contamination source resulted to be the atmospheric soil particle deposition. Furthermore, the results
were compared with those obtained from the lichens collected in central and southern Tierra del Fuego. This study confirms
the ability of U. barbata to reflect the background levels of the 26 elements in that environment. Compared with other background sites in the world,
we did confirm that Tierra del Fuego lichens have a low content of the studied elements. Tierra del Fuego turned out not to
be a pristine environment as supposed, but it can be considered as a reference basal ecosystem for useful comparisons among
different geographical areas. These findings can be very relevant and useful for environmental conservation programs. 相似文献
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Coppi Andrea Colzi Ilaria Lastrucci Lorenzo Castellani Maria Beatrice Gonnelli Cristina 《Environmental science and pollution research international》2022,29(35):52752-52760
Environmental Science and Pollution Research - In this work, we evaluated whether the species Myriophyllum aquaticum (Vell.) Verdc. can be a promising material for devising reliable... 相似文献
48.
Reyer Christopher P.O Otto Ilona M. Adams Sophie Albrecht Torsten Baarsch Florent Cartsburg Matti Coumou Dim Eden Alexander Ludi Eva Marcus Rachel Mengel Matthias Mosello Beatrice Robinson Alexander Schleussner Carl-Friedrich Serdeczny Olivia Stagl Judith 《Regional Environmental Change》2017,17(6):1639-1650
Regional Environmental Change - This paper synthesizes what is known about the physical and biophysical impacts of climate change and their consequences for societies and development under... 相似文献
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The use of iridium in the latest catalytic converters to further reduce nitrogen oxide emission in the exhaust of lean-burn engines could result in increased atmospheric levels of this element in high-density vehicle traffic areas. The objective of this study is to assess environmental Ir pollution and its urinary levels in workers and an urban control group. Environmental monitoring inside a tram consisted in air samplings of total suspended particles (TSP), PM10 and PM2.5 carried out during November 2005. Urinary Ir levels were evaluated in 64 municipal tram drivers and in 58 administrative employees as controls. Quantification of Ir in air samples and urine was performed by means of Sector Field Inductively Coupled Plasma Mass Spectrometry. Means+/-standard deviation of Ir levels in TSP, in PM10 and PM2.5 fractions were 1.43+/-1.66, 0.44+/-0.27 and 0.36+/-0.19 pg m(-3), respectively. No statistically significant differences were observed among urinary Ir values in the exposed subjects and control group. The Ir levels in Rome air are still sufficiently low, even if the increased use of new Ir-based catalysts could be of some concern in the near future. The results of our study are of interest as they are a first attempt to explore airborne levels and urinary concentrations of Ir in an urban context at medium-high density of vehicle traffic. Particular attention should be given to the fact that Ir was found in the finest dust particles as the effects of fine particles containing Ir have not yet been studied. 相似文献