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281.
Zhan Manjun Yang Xi Yang Hongshen Kong Lingren 《Frontiers of Environmental Science & Engineering in China》2007,1(3):311-315
The photochemical degradation of bisphenol A (BPA) was studied in the presence of natural humic substances from different
origins under simulated solar irradiation. BPA underwent insignificant direct photolysis in neutral water, but rapid photosensitized
degradation in four humic substances solutions via pseudo-first-order reaction occurred. The photo-degradation rate of BPA
was insensitive to the different initial BPA concentrations and was inhibited in aerated solution compared with the deoxygenated
medium. The reactive oxygen species (ROS) such as ·OH and 1O2 produced from excitation of humic substances under irradiation was determined from the quenching kinetic experiment using
molecular probe. The five main intermediate photoproducts of BPA in Nordic lake fulvic acid (NOFA) were tentatively identified
using gas chromatography/mass spectrometer (GC/MS). Based on the identification of ROS and the analysis of photoproduct formation,
the possible phototransformation pathways of BPA were proposed, involving the direct photolysis due to the energy transfer
from the triplet state humic substance (3HS*) to BPA molecules and hydroxyl radical addition and oxidation as well.
Translated from Acta Scientiae Circumstantiae, 2005, 25(6): 816–820 [译自: 环境科学学报] 相似文献
282.
283.
介绍了水厂排泥水的性质、组分、脱水性能、沉降特性以及高分子絮凝剂的选择。给出了符合水厂排泥水处理要求的工艺流程方案。 相似文献
284.
印刷线路板的回收由于其结构和组成材料的复杂性,被认为是电子电器产品回收中的重点和难点之一。提出了将超临界流体技术应用于废弃印刷线路板的回收工艺,研究出了一种环境友好的废弃印刷线路板回收方法。建立了回收模型及回收实验平台,并使用正交实验设计方法对实验进行设计,利用SPSS分析软件对实验数据进行了分析研究并结合实际实验结果得出了最佳工艺参数。通过对反应生成物进行质谱分析,推测出了生成物的主要组分,并据此对反应机理进行了研究。 相似文献
285.
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288.
为了探讨低PH和铝对水生生物的毒性或联合毒性效应,进一步研究钙缓解作用机理,用放射性核力’Ca作为示踪剂,研究在低pH值及加铝条件下,泥鳅(Misgurnusanguillicaudatus)对钙离子的吸收分布情况.结果表明,生长在pH为7.10时,45Ca在泥鳅体内各器官的96h放射性比度为:皮肤39532Cpm/g,骨骼38116Cpm/g,鳃25495cpm/g,肌肉1651cpm/s;低pH(4.70)条件下,泥鳅体内45Ca含量较正常条件下(对照组PH7.0)下降百分比为:皮肤81.07%,骨骼84.41%,鳃80.11%,肌肉5.88%;在低PH值并加铝时,泥鳅体内备器官45Ca含量与对照组相比,下降百分比分别为:皮肤89.87%.骨骼88.83%,鳃86.17%,肌肉26.47%.并讨论了酸雨危害对鱼体钙代谢的可能影响. 相似文献
289.
Use of zeolitized coal fly ash in the simultaneous removal of ammonium and phosphate from aqueous solution 总被引:1,自引:0,他引:1
Wu Deyi Hu Zhanbo Wang Xinze He Shengbing Kong Hainan 《Frontiers of Environmental Science & Engineering in China》2007,1(2):213-220
Discharge of wastewater containing nitrogen and phosphate can cause eutrophication. Therefore, the development of an efficient
material for the immobilization of the nutrients is important. In this study, a low calcium fly ash and high calcium fly ash
were converted into zeolite using the hydrothermal method. The removal of ammonium and phosphate that coexist in aqueous solution
by the synthesized zeolites were studied. The results showed that zeolitized fly ash could efficiently eliminate ammonium
and phosphate at the same time. Saturation of zeolite with Ca2+ rather than Na+ favored the removal of both ammonium and phosphate because the cation exchange reaction by the NH4
+ resulted in the release of Ca2+ into the solution and precipitation of Ca2+ with PO4
3− followed. An increase in the temperature elevated the immobilization of phosphate whereas it abated the removal of ammonium.
Nearly 60% removal efficiency for ammonium was achieved in the neutral pH range from 5.5 to 10.5, while the increase or decrease
in pH out of the neutral range lowered the adsorption. In contrast, the removal of phosphate approached 100% at a pH lower
than 5.0 or higher than 9.0, and less phosphate was immobilized at neutral pH. However, there was still a narrow pH range
from 9.0 to 10.5 favoring the removal of both ammonium and phosphate. It was concluded that the removal of ammonium was caused
by cation exchange; the contribution of NH3 volatilization to immobilization at alkaline conditions (up to pH level of 11.4) was limited. With respect to phosphate immobilization,
the mechanism was mainly the formation of precipitate as Ca3(PO4)2 within the basic pH range or as FePO4 and AlPO4 within acidic pH range. 相似文献
290.
炻器餐饮具的抗菌研究 总被引:3,自引:0,他引:3
以一种特种陶瓷——炻器为载体,分别用负载TiO2光催化薄膜和添加抗菌剂的方法进行炻器餐饮具的抗菌研究。结果表明,在紫外光和日光下,表面负载了TiO2膜的炻器灭菌率分别为90%和88%,均高于未负载TiO2膜的炻器,且灭菌率随光强的增加而提高。复合银盐显示了很好的杀菌效果,当釉表层银含量为0.2%时,24h内对所有细菌的灭菌率为94.6%、总大肠菌群为96.9%。复合锌盐也有一定的灭菌效果,当釉表层锌含量为1.1%时,24h内对所有细菌的灭菌率为56.8%,总大肠菌群为59.3%。但将TiO2粉末加入炻器表层的釉中,却未显示灭菌作用。对掺杂的炻器表面层成分和掺杂后Ag^+、Zn^2+的溶出量进行了测定,对灭菌结果和机理也进行了讨论。 相似文献