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81.
Visibility impairing aerosols in the urban atmosphere of Delhi 总被引:1,自引:0,他引:1
Singh T Khillare PS Shridhar V Agarwal T 《Environmental monitoring and assessment》2008,141(1-3):67-77
To study the visual air quality of Delhi, size fractionated aerosols – coarse and fine fractions of PM10 – were collected and analysed for and EC at three sites with different background activities. The analysed species constitute a smaller portion of coarse fraction
(39%) but a larger portion of fine fraction (69%). The sampling was performed from June 2003 to November 2003 which covers
monsoon and post monsoon seasons.Aerosol data was used to describe the spatial variation of Visibility Range as a function
of chemical composition of visibility impairing aerosols. During the study period, visibility was found to be poor varying
between 4.7 and 13 km with an average value of 9.4 km. It is observed that visibility impairment was more due to carbonaceous
aerosol followed by sulphate. 相似文献
82.
Kirti Bhalla Shashi Bala Singh Rashmi Agarwal 《Environmental monitoring and assessment》2010,167(1-4):515-520
High performance liquid chromatographic (HPLC) method was developed for analysis of seven gibberellins, i.e., GA3, GA4, GA7, GA3 methyl ester, GA7 methyl ester 3,13 diacetate, GA7 methyl ester, and fusaric acid, using an isocratic system. Method was used for estimation of gibberellins from different Fusarium strains. Gibberellins were extracted from 28 strains of Fusarium, out of which six strains of Fusarium were isolated from soil of different parts of India and 22 strains were procured from the Indian Type Culture Collection, Indian Agricultural Research Institute, New Delhi. Extracts were analyzed for qualitative and quantitative estimation of gibberellins by thin layer chromatography and HPLC, respectively. On the basis of quantitative analysis of produced gibberellins by HPLC, they were categorized as low, moderate, and high gibberellin producing strain. For the first time, Fusarium solani was also reported as high GA3 producing strain. 相似文献
83.
Dynamics of toxic heavy metals in different compartments of a highly urbanized closed aquatic system
This paper deals with the dynamics of chromium, nickel, copper and lead among the different components namely water, surface sediments, submerged and free floating macrophytes and fish of the twin manmade lakes, Upper and Lower lakes, of Bhopal (M.P., India). Some basic parameters of water and sediment have also been studied. The basin of the lake system is densely populated and the water is used for various purposes including drinking. Ni and Pb along with nitrate in both lakes are significantly higher than the drinking water quality criteria of USEPA. The concentration of the metals in the sediments is noticeably higher than that present in the adjoining rock, particularly Ni and Pb. There is a significant uptake of metals by the macrophytes (Eichhornia crassipes and Hydrilla verticillata) and fish (Labeo rohita and Oreochromis niloticus) mainly in summer. The fish of Lower lake (O. niloticus) is unfit for human consumption. The data have been statistically treated. Principle component analysis and cluster analysis were performed to define the origin of metals and to assess the relationship among the sites. Overall the Lower lake is more polluted than the Upper lake. In aggregate, the lake system is under an environmental stress due to certain practices. 相似文献
84.
V. K. Gupta Deepak Pathania Shilpi Agarwal Shikha Sharma 《Environmental science and pollution research international》2013,20(4):2632-2644
The utilization of sustainable and biodegradable lignocellulosic fiber to detoxify the noxious Cr(VI) from wastewater is considered a versatile approach to clean up a contaminated aquatic environment. The aim of the present research is to assess the proficiency and mechanism of biosorption on Ficus carica bast fiber via isotherm models (Langmuir, Freundlich, Temkin, Harkin’s–Jura, and Dubinin–Radushkevich), kinetic models, and thermodynamic parameters. The biomass extracted from fig plant was characterized by scanning electron microscopy and Fourier-transform infrared spectroscopy. To optimize the maximum removal efficiency, different parameters like effect of initial concentration, effect of temperature, pH, and contact time were studied by batch method. The equilibrium data were best represented by the Langmuir isotherm model, and the maximum adsorption capacity of Cr(VI) onto biosorbent was found to be 19.68 mg/g. The pseudo-second-order kinetic model adequately described the kinetic data. The calculated values of thermodynamic parameters such as enthalpy change (?H 0), entropy change (?S 0), and free energy change (?G 0) were 21.55 kJ/mol, 76.24 J/mol?K, and ?1.55 kJ/mol, respectively, at 30 °C which accounted for spontaneous and endothermic processes. The study of adsorbent capacity for Cr(VI) removal in the presence of Na+, Mg2+, Ca2+, SO 4 2? , HCO 3 ? and Cl? illustrated that the removal of Cr(VI) increased in the presence of HCO3? ions; the presence of Na+, SO 4 2? or Cl? showed no significant influence on Cr(VI) adsorption, while Ca2+ and Mg2+ ions led to an insignificant decrease in Cr(VI) adsorption. Further, the desorption studies illustrated that 31.10 % of metal ions can be removed from an aqueous system, out of which 26.63 % of metal ions can be recovered by desorption in first cycle and the adsorbent can be reused. The results of the scale-up study show that the ecofriendly detoxification of Cr(VI) from aqueous systems was technologically feasible. 相似文献
85.
The chemo-thermal oxidation method at 375 °C (CTO-375) has been widely used to quantify black carbon (BC) in sediments. In the present study, CTO-375 was tested and adapted for application to soil, accounting for some matrix specific properties like high organic carbon (≤39%) and carbonate (≤37%) content. Average recoveries of standard reference material SRM-2975 ranged from 25 to 86% for nine representative Swiss and Indian samples, which is similar to literature data for sediments. The adapted method was applied to selected samples of the Swiss soil monitoring network (NABO). BC content exhibited different patterns in three soil profiles while contribution of BC to TOC was found maximum below the topsoil at all three sites, however at different depths (60-130 cm). Six different NABO sites exhibited largely constant BC concentrations over the last 25 years, with short-term (6 months) prevailing over long-term (5 years) temporal fluctuations. 相似文献
86.
John A. Connor Lisa J. Molofsky Shawn M. Paquette Robert E. Hinchee Shilpi P. Desai Miriam K. Connor 《补救:环境净化治理成本、技术与工艺杂志》2011,21(3):121-144
This article quantifies the nature, frequency, and cost of environmental remediation activities for onshore oil and gas operations, as determined from over 4,100 environmental remediation cases in Texas, Kansas, New Mexico, and Colorado. For the purpose of this article, “remediation'' refers to cleanup efforts that entail longer‐term site characterization, monitoring, and remedial action beyond the initial spill cleanup or emergency response stage. In addition, data are also presented regarding short‐term spill cleanup activities in two of the four states. © 2011 Wiley Periodicals, Inc. 相似文献
87.
Malik Vivek Singh Singh Manvi Pradhan Pranita Singal Kusum Agarwal Amit Chauhan Anil Sra Harnoor Singh Meenu 《Environmental science and pollution research international》2022,29(25):37556-37564
Environmental Science and Pollution Research - Exposure to lead among children, as well as adults, is a major global health issue. With diverse routes of exposure (e.g., food, air, and water)... 相似文献