全文获取类型
收费全文 | 666篇 |
免费 | 2篇 |
国内免费 | 10篇 |
专业分类
安全科学 | 10篇 |
废物处理 | 51篇 |
环保管理 | 46篇 |
综合类 | 62篇 |
基础理论 | 106篇 |
污染及防治 | 258篇 |
评价与监测 | 79篇 |
社会与环境 | 66篇 |
出版年
2023年 | 12篇 |
2022年 | 47篇 |
2021年 | 51篇 |
2020年 | 18篇 |
2019年 | 21篇 |
2018年 | 30篇 |
2017年 | 27篇 |
2016年 | 46篇 |
2015年 | 23篇 |
2014年 | 36篇 |
2013年 | 64篇 |
2012年 | 31篇 |
2011年 | 59篇 |
2010年 | 29篇 |
2009年 | 29篇 |
2008年 | 29篇 |
2007年 | 27篇 |
2006年 | 29篇 |
2005年 | 17篇 |
2004年 | 12篇 |
2003年 | 9篇 |
2002年 | 14篇 |
2001年 | 5篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1996年 | 2篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1970年 | 1篇 |
1968年 | 2篇 |
1957年 | 1篇 |
排序方式: 共有678条查询结果,搜索用时 15 毫秒
241.
Suzana M. L. de Oliveira Marcionilio Gisele M. Alves Rachel B. Góes e Silva Pablo J. Lima Marques Poliana D. Maia Brenno A. D. Neto José J. Linares 《Environmental science and pollution research international》2016,23(19):19084-19095
This paper focuses on the influence of the current density treatment of a concentrated 1-butyl-3-methylimidazolium chloride (BMImCl) solution on an electrochemical reactor with a boron-doped diamond (BDD) anode. The decrease in the total organic carbon (TOC) and the BMImCl concentration demonstrate the capability of BDD in oxidizing ionic liquids (ILs) and further mineralizing (to CO2 and NO3 ?) more rapidly at higher current densities in spite of the reduced current efficiency of the process. Moreover, the presence of Cl? led to the formation of oxychlorinated anions (mostly ClO3 ? and ClO4 ?) and, in combination with the ammonia generated in the cathode from the nitrate reduction, chloramines, more intensely at higher current density. Finally, the analysis of the intermediates formed revealed no apparent influence of the current density on the BMImCl degradation mechanism. The current density presents therefore a complex influence on the IL treatment process that is discussed throughout this paper. 相似文献
242.
Martín-Mata J. Lahoz-Ramos C. Bustamante M. A. Marhuenda-Egea F. C. Moral R. Santos A. Sáez J. A. Bernal M. P. 《Environmental science and pollution research international》2016,23(17):17357-17369
Environmental Science and Pollution Research - In this work, different analytical techniques (thermal analysis, 13C cross-polarization magic angle spinning (CPMAS) NMR and Fourier transform... 相似文献
243.
Marcia Freire Pinto José Silva Mourão Rômulo Romeu Nóbrega Alves 《Environment, Development and Sustainability》2017,19(2):679-692
Fish are a valuable source of essential micronutrients and animal protein consumed worldwide, especially in coastal regions. However, changes have been observed in eating habits of many fishing communities in Brazil, although this is seldom investigated in the northeast region of the country. Therefore, the aim of this study was to characterize food consumption of meat, especially fish meat, in two fishing communities of Brazilian Northeast. During 2013, information was collected through interviews and food frequency questionnaires regarding eating habits of artisanal fishermen and their families. It was found that fish was the main source of animal protein, although there are differences in consumption according to age and gender of respondents due to dietary restrictions. A difference in the frequency of fish consumption among the communities studied was also found, and there was no correlation between fishermen’s fish preference and fish with higher commercial value. The information obtained is important to understand eating habits of fishing communities, contributing to the development and implementation of public health policies with a focus on food and nutrition security. 相似文献
244.
Luciene Alves Batista Siniscalchi Laura Rabelo Leite Guilherme Oliveira Carlos Augusto Lemos Chernicharo Juliana Calabria de Araújo 《Environmental science and pollution research international》2017,24(20):16751-16764
Methane is produced in anaerobic environments, such as reactors used to treat wastewaters, and can be consumed by methanotrophs. The composition and structure of a microbial community enriched from anaerobic sewage sludge under methane-oxidation condition coupled to denitrification were investigated. Denaturing gradient gel electrophoresis (DGGE) analysis retrieved sequences of Methylocaldum and Chloroflexi. Deep sequencing analysis revealed a complex community that changed over time and was affected by methane concentration. Methylocaldum (8.2%), Methylosinus (2.3%), Methylomonas (0.02%), Methylacidiphilales (0.45%), Nitrospirales (0.18%), and Methanosarcinales (0.3%) were detected. Despite denitrifying conditions provided, Nitrospirales and Methanosarcinales, known to perform anaerobic methane oxidation coupled to denitrification (DAMO) process, were in very low abundance. Results demonstrated that aerobic and anaerobic methanotrophs coexisted in the reactor together with heterotrophic microorganisms, suggesting that a diverse microbial community was important to sustain methanotrophic activity. The methanogenic sludge was a good inoculum to enrich methanotrophs, and cultivation conditions play a selective role in determining community composition. 相似文献
245.
Physiological studies were made on the crabs Ucides cordatus (L.) and Callinectes danae sampled from populations living in “polluted” mangroves on the southeast littoral of Brazil. Analysis of Cu, Cd, Zn, and
Fe of sediments and crab tissues showed interspecific differences in tissue concentrations, and significantly higher levels
of Cu, Cd, and Zn in “polluted” populations compared to “unpolluted” crabs living in uncontaminated mangrove in the same geographical
area. Individuals of both species from the polluted site showed significantly greater capacities for regulating blood osmotic
concentrations at low salinity (9‰). However, U. cordatus showed a reduced hypo-regulatory ability in 34‰S. Differences in ionoregulation were also seen. “Polluted”C. danae showed significantly higher Na/ K-ATPase levels in posterior gills compared to “unpolluted” crabs. Oxygen consumption rates
(M˙
O2) were elevated in U. cordatus, but depressed in C. danae from the “polluted” population. Individuals of both species from this site showed significantly lower O:N ratios, mainly
because of an increased net efflux of ammonia. Adenylate energy charge (AEC) values of muscle and hepatopancreas in “unpolluted”
and “polluted” populations of both species were not significantly different. These physiological differences are discussed
in relation to the known acute physiological and metabolic effects of heavy metals in crustaceans, and interpretated in the
light of possible adaptive changes following long-term exposure to contamination.
Received: 6 August 1999 / Accepted: 22 June 2000 相似文献
246.
247.
Maísa Tatiane Ferreira de Souza Elizangela Ambrosio Cibele Andrade de Almeida Thábata Karoliny Formicoli de Souza Freitas Lídia Brizola Santos Vitor de Cinque Almeida Juliana Carla Garcia 《Environmental monitoring and assessment》2014,186(8):5261-5271
The goal of this study was to investigate the activity of the coagulant extracted from the cactus Opuntia ficus-indica (OFI) in the process of coagulation/flocculation of textile effluents. Preliminary tests of a kaolinite suspension achieved maximum turbidity removal of 95 % using an NaCl extraction solution. Optimization assays were conducted with actual effluents using the response surface methodology (RSM) based on the Box–Behnken experimental design. The responses of the variables FeCl3, dosage, cactus dosage, and pH in the removal of COD and turbidity from both effluents were investigated. The optimum conditions determined for jeans washing laundry effluent were the following: FeCl3 160 mg L?1, cactus dosage 2.60 mg L?1, and pH 5.0. For the fabric dyeing effluent, the optimum conditions were the following: FeCl3 640 mg L?1, cactus dosage 160 mg L?1, and pH 6.0. Investigation of the effects of the storage time and temperature of the cactus O. ficus-indica showed that coagulation efficiency was not significantly affected for storage at room temperature for up to 4 days. 相似文献
248.
249.
Cerdeira AL dos Santos NA Pessoa MC Gomes MA Lanchote VL 《Journal of environmental science and health. Part. B》2005,40(1):159-165
The region of Ribeir?o Preto City, located in Southeast of Brazil, S?o Paulo State, is an important sugarcane, soybean, and corn producing area with a high level of pesticides utilization. This region is also an important recharge area for groundwater supply of the Guarany aquifer. Since the past ten years atrazine, simazine, ametryn, tebuthiuron, diuron, 2,4-D, picloram, and hexazinone are the main herbicides used in this area. In order to study a possible leaching of some of these herbicides into the aquifer, surface, and groundwater samples were collected in a watershed during the years of 1996 to 2003, from different locations. To detect and quantify the herbicides a GC-MS (gas chromatograph/mass spectrometry) method was used. The response of the herbicides analyzed was linear over the concentration range of 0.02 to 2.0 microg/L. Analysis of groundwater revealed that the herbicides tebuthiuron, diuron, atrazine, simazine, and ametryn were not present in the samples. In the surface water collected in 1997, ametryn was present in two out of nine locations with concentrations ranging from 0.17 and 0.23 microg/L, which is above the allowable 0.1 microg/L according to the European safety level. The leaching potential of tebuthiuron, diuron, atrazine, simazine, 2,4-D, picloram, and hexazinone has been evaluated using CMLS-94, "Chemical Movement in Layered Soil," as simulation model. No leaching into the depth of the water table at 40 m was found. 相似文献
250.
In the 1950s, a production plant of hexachlorocyclohexane (HCH) was established in Brazil with the main purpose of producing chemicals for vectors control. This factory was closed down in 1955 and around 300 tons of production residues were left behind in the open air. In 1995, the area was treated with lime to eliminate the HCH contamination. Soil sample gave a PCDD/F concentration of 13 900 ng I-TEQ/kg whereas samples from the neighborhood ranged from 0.19 to 2.08 ng I-TEQ/kg. PCDD/F levels in cow's milk samples varied from 4.1 to 6.5 pg I-TEQ/g of milk fat. High concentration in soil collected from the site suggests that treatment and recovery shall be made. Further dioxin monitoring is needed to better estimate the risk posed to local population through food consumption and soil usage. 相似文献