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131.
132.
Valérie Bert Piet Seuntjens Winnie Dejonghe Sophie Lacherez Hoang Thi Thanh Thuy Bart Vandecasteele 《Environmental science and pollution research international》2009,16(7):745-764
Background, aim and scope
Polluted sediments in rivers may be transported by the river to the sea, spread over river banks and tidal marshes or managed, i.e. actively dredged and disposed of on land. Once sedimented on tidal marshes, alluvial areas or control flood areas, the polluted sediments enter semi-terrestrial ecosystems or agro-ecosystems and may pose a risk. Disposal of polluted dredged sediments on land may also lead to certain risks. Up to a few years ago, contaminated dredged sediments were placed in confined disposal facilities. The European policy encourages sediment valorisation and this will be a technological challenge for the near future. Currently, contaminated dredged sediments are often not valorisable due to their high content of contaminants and their consequent hazardous properties. In addition, it is generally admitted that treatment and re-use of heavily contaminated dredged sediments is not a cost-effective alternative to confined disposal. For contaminated sediments and associated disposal facilities used in the past, a realistic, low cost, safe, ecologically sound and sustainable management option is required. In this context, phytoremediation is proposed in the literature as a management option. The aim of this paper is to review the current knowledge on management, (phyto)remediation and associated risks in the particular case of sediments contaminated with organic and inorganic pollutants. 相似文献133.
The methylation reaction of tin(II) with methylcobalamin (CH(3)B(12)) in aquatic systems was modeled in the laboratory. The products were detected by a sensitive gas chromatography-flame photometric detector (GC-FPD), and further identified by gas chromatography-mass spectrometry (GC-MS). Both monomethyltin (MMT) and dimethyltin (DMT) were found as methylation products. Three important effecting factors during the methylation reaction, salinity, pH and aerobic or anaerobic, were studied. The results showed that methyl group can be transferred from CH(3)B(12) to tin in aquatic solutions as a radical or carbonium, as well as a carbanion. Two explanations for the pH-dependency of the methylation reaction between tin(II) and CH(3)B(12) were proposed: pH-dependency of the equilibrium states of CH(3)B(12), and pH-dependency of inorganic tin(II) species whose reactivity vary with the redox potential in the solution. Salinity can influence the activity of the methyl donor, which cause changes in the methylation efficiency. Kinetic experiments showed that the methylation reaction was pseudo-first-order for CH(3)B(12). 相似文献
134.
135.
Thang Nguyen Quoc Huy Bui The Khanh Dang Nguyen Nha Vy Ngo Thi Tuong Phuong Tran Ha Sy Do Trung Tham Le Thi Phuong Nguyen Thi Kim 《Environmental science and pollution research international》2021,28(39):54960-54971
Environmental Science and Pollution Research - This study aimed to evaluate the health risks of cadmium (Cd), lead (Pb), inorganic arsenic (As), and nitrate exposure through the consumption of... 相似文献
136.
Rameshwar Sankar Sudharsan Sivaprakash Baskaran Rajamohan Natarajan Mohamed Badr A. Vo Dai-Viet N. 《Environmental Chemistry Letters》2023,21(5):2995-3022
Environmental Chemistry Letters - Antibiotic resistance is a major health issue partly caused by the diffusion of antibiotic pollution in the natural environment, thus calling for advanced methods... 相似文献
137.
In 1998, the Vietnamese National Assembly approved a Five Million Hectare Reforestation Program, (5MHRP) 1998-2010. It would increase forest cover by some 45%, use barren hills, produce wood, and generate socioeconomic development. It would, however, also put demands on Vietnamese planning. Experiences from a former development project and two case studies from a commune and village are used as a basis for analyzing the planning system. The study describes the objectives and strategies of government and farmers in one commune and one village and analyzes how planning data influence scenarios on future development. Official planning data do not reflect reality but are derived through negotiations. In the commune and village studied, it would be difficult for the 5MHRP to materialize, as most of the forest land, officially not yet used, is actually used for food production. The approach and method used by the study offers alternatives to current planning practices. 相似文献
138.
Thanh Wang Jianjie Fu Yawei Wang Chunyang Liao Yongqing Tao Guibin Jiang 《Environmental pollution (Barking, Essex : 1987)》2009,157(8-9):2445-2451
Scalp hair samples were collected at an electronic waste (e-waste) recycling area and analyzed for trace elements and heavy metals. Elevated levels were found for Cu and Pb with geometric means (GMs) at 39.8 and 49.5 μg/g, and the levels of all elements were found in the rank order Pb > Cu ? Mn > Ba > Cr > Ni > Cd > As > V. Besides Cu and Pb, Cd (GM: 0.518 μg/g) was also found to be significantly higher compared to that in hair samples from control areas. Differences with age, gender, residence status and villages could be distinguished for most of the elements. The high levels of Cd, Cu and Pb were likely found to be originated from e-waste related activities, and specific sources were discussed. This study shows that human scalp hair could be a useful biomarker to assess the extent of heavy metal exposure to workers and residents in areas with intensive e-waste recycling activities. 相似文献
139.
An evaluation of alternative household solid waste treatment practices using life cycle inventory assessment mode 总被引:1,自引:0,他引:1
Waste disposal is an important part of the life cycle of a product and is associated with environmental burdens like any other
life-cycle stages. In this study, an integrated assessment for solid waste treatment practices, especially household solid
waste, was undertaken to evaluate the impact contribution of household solid waste treatment alternatives towards the sustainable
development by using Life Cycle Inventory Assessment method. A case study has been investigated under various possible scenarios, such as (1) landfill without landfill gas recovery,
(2) landfill with landfill gas recovery and flaring, (3) landfill with landfill gas recovery and electric generation, (4)
composting, and (5) incineration. The evaluation utilized the Life Cycle Inventory Assessment method for multiple assessments based on various aspects, such as greenhouse gas emission/reduction, energy generation/consumption,
economic benefit, investment and operating cost, and land use burden. The results showed that incineration was the most efficient
alternative for greenhouse gas emission reduction, economic benefit, energy recovery, and land use reduction, although it
was identified as the most expensive for investment and operating cost, while composting scenario was also an efficient alternative
with quite economic benefit, low investment and operating cost, and high reduction of land use, although it was identified
as existing greenhouse gas emission and no energy generation. Furthermore, the aim of this study was also to establish localized
assessment methods that waste management agencies, environmental engineers, and environmental policy decision makers can use
to quantify and compare the contribution to the impacts from different waste treatment options. 相似文献
140.
White Spot Syndrome Virus (WSSV) is the major and most serious pathogen in shrimp aquaculture industries. By using a sensitive PCR-based detection technique followed by sequencing multiple PCR products for confirmation, we address to the question of whether WSSV can persist in shrimp ponds and surrounding areas after an outbreak. The seawater samples were taken from two shrimp ponds and surrounding canals in a coastal area in northern Vietnam, Quang Ninh Province where the shrimps cultured in the two ponds had been killed due to a WSSV outbreak in April 2001 and the ponds were thereafter abandoned. A total of 480 seawater samples (30 samples each for July and December of 2001 and 2002) were subjected to WSSV genome detection. Although the detection rates of WSSV genome were generally gradually declined in seawater environments of both diseased shrimp ponds and surrounding canals, WSSV was still detected with rates of more than 10% in the diseased ponds and lower in surrounding canals in December 2002, 20 months after the WSSV outbreak. 相似文献