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51.
Patra AC Sumesh CG Mohapatra S Sahoo SK Tripathi RM Puranik VD 《Journal of environmental management》2011,92(3):919-925
A semi-dynamic leaching test was carried out for metallurgical wastes and ore samples from the uranium and copper mining industry over a 142 day period using distilled water and 0.1N NaNO(3) as solvents. Laser fluorimetry was used as the analytical technique to determine the total uranium content in the leachates. The cumulative leach fraction (CLF) of uranium release from the samples was calculated to be 0.22, 0.22, 0.07 and 0.39% for rock, uranium tailings, copper kinker ash samples and copper tailings respectively using distilled water as solvent and 0.31, 0.27, 0.05 and 0.59% for the same matrices using 0.1N NaNO(3). The release of mobile uranium fraction was very slow, being faster in the initial stage and then attained a near steady state condition. The diffusion coefficient and bulk release of uranium from the samples have been calculated. The processes governing the release of uranium from these matrices have been identified to be surface wash-off and diffusion. Hence the use of weak solvents (leach out the mobile/exchangeable fraction of uranium) under semi-dynamic conditions aids the determination of leaching parameters and identification of the leaching mechanism for mobile uranium fraction from different matrices by slow leaching processes. 相似文献
52.
The toxic effects of alphamethrin on catalase (CAT) and protein profile in liver, heart, kidney, and intestine of the freshwater
catfish Clarias batrachus have been investigated. CAT activity and specific activity decreased in liver, heart, kidney, and intestine on exposure of
sublethal concentration of alphamethrin for 14 days. Similarly, protein content declined in different tissues of the fish
exposed to alphamethrin. Maximum decline in CAT activity was in liver, while minimum decrease was in intestine. Maximum reduction
in CAT specific activity was in kidney and minimum in heart. Protein content declined maximum in liver and minimum in heart.
Alphamethrin-induced reduction in CAT activity and specific activity might be due to binding of pesticide with enzyme or by
inhibiting the enzyme synthesis. The reduction in protein content might be due to extensive proteolysis. The results suggested
alphamethrin-induced reduction in oxidative defense and protein profile of the catfish. 相似文献
53.
Ameliorating effects of cortisol and T3 on alphamethrin-dependent changes in the catalase (CAT) and protein profile of the freshwater catfish, Clarias batrachus, were studied. CAT activity and specific activity decreased in the liver, heart, kidney, and intestine after exposure to
alphamethrin for 14 days. The administration of cortisol to alphamethrin-exposed fish brought the activity and specific activity
of CAT up to their control values. The protein content decreased in different tissues of the fish after exposure to alphamethrin.
The administration of T3 to alphamethrin-exposed fish reduced the protein content to the control value. Therefore, it can be suggested that cortisol
and T3 may be used to ameliorate the toxicological effects of alphamethrin in fish. 相似文献
54.
Singh R Singh S Tripathi R Agrawal SB 《Journal of environmental biology / Academy of Environmental Biology, India》2011,32(2):139-145
Present study is conducted to evaluate the response of bean (Dolichos lablabcv . pusa early prolific) plants to supplemental UV-B (sUV-B: 280-315 nm: 7.2 kJ m(-2) d(-1)) radiation. UV-B caused alteration in biomass translocation pattern with more retention of biomass in below ground parts leading to an increment in root shoot ratio. Specific leaf area (SLA) which is the measure of leaf thinness, increased in plants under sUV-B exposure by 95.7 and 82.3% after 15 and 30 days after germination. Photosynthetic machinery of bean plants was the potential target of UV-B as photosynthetic rate was decreased by 88.6% at 30 days after germination. sUV-B lead to the formation of reactive oxygen species thus generating oxidative stress. Stimulation of antioxidant defense system (enzymatic and non-enzymatic) was observed due to sUV-B radiation. Phenolic content decreased (34.7 and 18.6%) but protein showed varied response, increased initially (34%) thereafter declined (10.2%) under sUV-B radiation. 相似文献
55.
Syed Aamir Aijaz Kamal Muhammad Abdul Tripathi Ravindra 《Environmental science and pollution research international》2021,28(39):54744-54755
Environmental Science and Pollution Research - Environmental pollution caused by carbon emissions is an emerging issue to study among researchers. The nexus between environmental pollution and... 相似文献
56.
The aim of this study was to assess the toxicity reduction of wastewaster after treatment with fly ash. Fly ash is a waste material which is formed as a result of coal burning in power plants, but has the potential to adsorb heavy metal ions. The present study examined the adsorption capacity of fly ash to adsorb Pb2+, Cu2+, and Zn2+ from waste water under different conditions of contact time, pH, and temperature. Uptake of metal ions by fly ash generally rose with increasing pH. At lower temperatures the uptake of heavy metal adsorption were enhanced. Significant reduction in Pb2+ (79%), Cu2+ (53%), and Zn2+ (80%) content was found after treatment with fly ash of waste water treatment. Using the microtox test toxicity of the effluent was reduced by 75% due to removal of Pb2+ ion by the fly ash. Data indicated that fly ash generated by power plants may be used beneficially to remove metals from waste water. 相似文献
57.
58.
Masto R. E. Singh M. K. Rout T. K. Kumar A. Kumar S. George J. Selvi V. A. Dutta P. Tripathi R. C. Srivastava N. K. 《Environmental geochemistry and health》2019,41(5):1923-1937
Environmental Geochemistry and Health - Polycyclic aromatic hydrocarbons (PAHs) and potentially toxic elements (PTEs) (Ba, Zn, Pb, Cu, Cr, Ni, As, Co) were determined in the road dusts of a coal... 相似文献
59.
The level of toxic metals Cr, Cd, Pb and Cu was determined in seeds, water and sediments collected from nine closed waterbodies of Darbhanga, north Bihar, used for cultivation of the edible aquatic macrophyte Euryaleferox Salisb. during harvesting season of the crop for two successive years (1996 and 1997). Seeds bioconcentrated appreciable amount of these toxic metals in the order Pb > Cr > Cu > Cd. The increased load of metal pollution due to domestic and municipal discharges threatened the habitats of the plant. The toxic metal contents in seeds were found positively correlated with the ambient concentration of metals in water and sediments. The importance of these findings has been discussed for national water resource economy of the country and human health perspectives. 相似文献
60.
Acute toxicity of three herbicides, tafazine, bladex, and aresin, were studied for three species of freshwater teleost, namely, Labeo rohita, Mystus vittatus, and Cirrhinus mrigala, and benthic macroinvertebrate, midge larvae, Chironomus tentans, L. rohita and C. mrigala were found susceptible to all three herbicides as compared to M. vittatus and C. tentans, which were more susceptible to the tafazine toxicity. The toxicity of the three herbicides was in order of tafazine>bladex>aresin. Investigation leads to the conclusion that some herbicides, though quickly degradable, form hazards for aquatic life even at very low levels. Their application must be monitored to prevent aquatic pollution. 相似文献