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21.
22.
Increasing polybrominated diphenyl ether (PBDE) contamination in sediment cores from the inner Clyde Estuary,UK 总被引:1,自引:0,他引:1
Christopher H. Vane Yun-Juan Ma She-Jun Chen Bi-Xian Mai 《Environmental geochemistry and health》2010,32(1):13-21
The concentrations of 16 polybrominated diphenyl ether (PBDE) congeners in six short sediment cores from the Clyde Estuary
were determined by gas-chromatography mass-spectrometry. Total PBDE concentrations ranged from 1 to 2,645 μg/kg and the average
concentration was 287 μg/kg. BDE-209 was the main congener and varied from 1 to 2,337 μg/kg. Elevated total PBDE concentrations
were observed close to the sediment surface in the uppermost 10 cm of four of the six sediment cores. Comparison of the down
core PBDE profiles revealed that the increase was driven by the accumulation of deca-BDE. Although the deca-BDE mix was dominant,
the presence of lower molecular weight congeners BDE-47, BDE-99, BDE-183 and BDE-153 at most sediment intervals suggested
additional sources of penta-BDE and octa-BDE pollution. Changing PBDE source input was the major factor in influencing the
proportion of nona-brominated congeners, although other explanations such as post burial photo-debromination of BDE-209 cannot
be entirely discounted. A clear cascading to lower hepta-, hexa-, and penta-homologues was not found. The increase in total
PBDE concentrations and particularly the deca-BDE may possibly be ascribed to the use and subsequent disposal of electrical
appliances such as televisions and computers. In the Clyde sediments, the proportion of nona-brominated congeners was higher
than that reported for commercial mixtures. This might be due to changing sources of PBDEs or post burial photo-debromination
of BDE-209. 相似文献
23.
Contents and sources of polycyclic aromatic hydrocarbons and organochlorine pesticides in vegetable soils of Guangzhou, China 总被引:36,自引:0,他引:36
We investigated contents, distribution and possible sources of PAHs and organochlorine pesticides (Ops) in 43 surface and subsurface soils around the urban Guangzhou where variable kinds of vegetables are grown. The results indicate that the contents of PAHs (16 US EPA priority PAHs) range from 42 to 3077 microg/kg and the pollution extent is classified as a moderate level in comparison with other investigations and soil quality standards. The ratios of methylphenanthrenes to phenanthrene(MP/P), anthracene to anthracene plus phenanthrene (An/178), benz[a]anthracene to benz[a]anthracene plus chrysene (BaA/228), indeno[1,2,3-cd]pyrene to indeno[1,2,3-cd]pyrene plus benzo[ghi]perylene (In/In+BP) suggest that the sources of PAHs in the soil samples are mixed with a dominant contribution from petroleum and combustion of fossil fuel. The correlation analysis shows that the PAHs contents are significantly related to total organic carbon contents (TOC) (R2=0.75) and black carbon contents (BC) (R2=0.62) in the soil samples. Dichlorodiphenyltrichloroethane and metabolites (DDTs) and hexachlorocyclohexanes and metabolites (HCHs) account largely for the contaminants of OPs. The concentrations of DDTs range from 3.58 to 831 microg/kg and the ratios for DDT/(DDD+DDE) are higher than 2 in some soil samples, suggesting that DDT contamination still exists and may be caused by its persistence in soils and/or impurity in the pesticide dicofol. The concentrations of HCHs are 0.19-42.3 microg/kg. 相似文献
24.
Tham Trinh Thi Hung Trinh Le Thuy Trinh Thi Mai Vu Thi Trinh Le Thi Hai Chu Vu Minh Tu Binh 《Environmental science and pollution research international》2022,29(28):41992-42004
Environmental Science and Pollution Research - The Red River is the largest river in northern Vietnam, and it serves as the main water source for production and human activities in the Red River... 相似文献
25.
Van Thinh Nguyen Chung Nguyen Thuy Luong Ly Thi Mai Chinh Pham Minh Anh Phan Phuong Huy Nguyen The Thuy Dang Thi Thai Phong K. 《Environmental science and pollution research international》2022,29(28):42055-42066
Environmental Science and Pollution Research - Industrial sludges from wastewater treatment plants of industrial parks and a drinking water treatment plant in northern Vietnam were investigated in... 相似文献
26.
Nguyen Vien Truong Doan Quang-Van Tran Ngoc Nguyen Luong Ly Thi Mai Chinh Pham Minh Thai Phong K. Phung Dung Le Hong H. T. C. Dang Tran Ngoc 《Environmental science and pollution research international》2022,29(49):74197-74207
Environmental Science and Pollution Research - Combined effects of global warming and rapid urbanization replace green spaces with urban facilities. Children in urban areas are at a higher risk of... 相似文献
27.
28.
沸石颗粒在污泥絮体中的形态及其对污泥泥水分离的影响 总被引:6,自引:0,他引:6
投加沸石粉提高了活性污泥的泥水分离性能。通过对沸石颗粒表面生物膜和投加了沸石粉的活性污泥絮体生长过程及成熟形态的微观观察,结果表明沸石颗粒不仅可以作为微生物载体长成生物膜,而且成为菌胶团核心和污泥絮体骨架,改善了污泥絮体的颗粒结构,从而增强了絮体强度,提高了絮体密度,降低了污泥塑性。研究结果表明沸石粉适宜的投加量为4g/L;在活性污泥中投加4g/L沸石粉后,SVI从193降低到155,污泥比阻从27.36×1012m/kg降低到5.67×1012m/kg;在沸石粉含量小于10g/L时,随着沸石粉含量的增加,污泥呈现压缩沉淀时界面沉速和出现压缩沉淀的时间持续减小。 相似文献
29.
我国造纸行业清洁生产的思路及案例分析 总被引:4,自引:0,他引:4
在分析我国造纸行业的污染现状及治理现状的基础,雌出了造纸行业清洁生产的初步思路框架,在该清洁生产思路的指导下,以茂名市造纸厂为案例进行了较为详细的分析,最后,提出了我国造纸行业实施可持续发展的战略措施。 相似文献
30.
We assessed the ability of the MM5/CMAQ model to predict ozone (O3) air quality over the Kanto area and to investigate the factors
that a ect simulation of O3. We find that the coupled MM5/CMAQ model is a useful tool for the analysis of urban environmental
problems. The simulation results were compared with observational data and were found to accurately replicate most of the important
observed characteristics. The initial and boundary conditions were found to have a significant e ect on simulated O3 concentrations.
The results show that on hot and dry days with high O3 concentration, the CMAQ model provides a poor simulation of O3 maxima when
using initial and boundary conditions derived from the CMAQ default data. The simulation of peak O3 concentrations is improved with
the JCAP initial and boundary conditions. On mild days, the default CMAQ initial and boundary conditions provide a more realistic
simulation. Meteorological conditions also have a strong impact on the simulated distribution and accumulation of O3 concentrations
in this area. Low O3 concentrations are simulated during mild weather conditions, and high concentrations are predicted during hot
and dry weather. By investigating the e ects of di erent meteorological conditions on each model process, we find that advection and
di usion di er the most between the two meteorological regimes. Thus, di erences in the winds that govern the transport of O3 and its
precursors are likely the most important meteorological drivers of ozone concentration over the central Kanto area. 相似文献