全文获取类型
收费全文 | 2966篇 |
免费 | 286篇 |
国内免费 | 1139篇 |
专业分类
安全科学 | 349篇 |
废物处理 | 132篇 |
环保管理 | 223篇 |
综合类 | 1995篇 |
基础理论 | 504篇 |
环境理论 | 1篇 |
污染及防治 | 703篇 |
评价与监测 | 169篇 |
社会与环境 | 157篇 |
灾害及防治 | 158篇 |
出版年
2024年 | 23篇 |
2023年 | 86篇 |
2022年 | 223篇 |
2021年 | 177篇 |
2020年 | 190篇 |
2019年 | 153篇 |
2018年 | 155篇 |
2017年 | 157篇 |
2016年 | 162篇 |
2015年 | 186篇 |
2014年 | 204篇 |
2013年 | 290篇 |
2012年 | 275篇 |
2011年 | 299篇 |
2010年 | 217篇 |
2009年 | 208篇 |
2008年 | 234篇 |
2007年 | 177篇 |
2006年 | 165篇 |
2005年 | 133篇 |
2004年 | 84篇 |
2003年 | 85篇 |
2002年 | 76篇 |
2001年 | 56篇 |
2000年 | 62篇 |
1999年 | 49篇 |
1998年 | 53篇 |
1997年 | 36篇 |
1996年 | 44篇 |
1995年 | 33篇 |
1994年 | 14篇 |
1993年 | 17篇 |
1992年 | 23篇 |
1991年 | 17篇 |
1990年 | 6篇 |
1989年 | 6篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1975年 | 1篇 |
排序方式: 共有4391条查询结果,搜索用时 343 毫秒
221.
采用O3-H2O2氧化法对印染废水进行氧化处理,比较了O3氧化法和O3-H2O2氧化法对印染废水的处理效果,考察了初始废水pH、H2O2加入量、O3流量和反应时间对废水的色度去除率和COD去除率的影响。实验结果表明:O3-H2O2氧化法对废水的COD和色度的去除效果比O3氧化法更好;在初始废水pH为11、H2O2加入量为13mmol/L、O3流量为6g/h、反应时间为60min的最佳工艺条件下,处理后废水COD为61.50mg/L,COD去除率为95.73%,废水色度为5倍,色度去除率为99.75%,TOC为37.84mg/L,TOC去除率为85.10%,BOD5为22.76mg/L,BOD5去除率为90.20%,BOD5/COD为0.37。 相似文献
222.
223.
在中空纤维膜接触器中以半胱氨酸合钴溶液为吸收液,采用膜吸收法处理NO废气。研究了对传质系数和NO去除率的影响因素,以及吸收液循环使用效果。实验结果表明:在进气流速为0.005 m/s、进气中NO质量浓度为650.14 mg/m3、吸收液pH为9、吸收液中半胱氨酸合钴浓度为0.017 mol/L、吸收液流速为0.003 m/s、吸收液温度为50℃的优化工艺条件下,吸收时间在55 min之内时,NO去除率保持在98%以上;吸收时间超过55 min之后,NO去除率迅速下降。吸收液经SO2还原处理后可多次循环使用,吸收效果基本不变。 相似文献
224.
225.
226.
The quantity of vehicles has increased rapidly in recent years in China; however, the recycling of End of Life Vehicles (ELV) faces several problems and barriers including the collection difficulty and the environmental pollution caused by improper dismantling. In this paper, based on analysis of the basic situation regarding management and recycling of ELV in China, the ELV flow was introduced, and the potential ELV quantity was estimated. The current management regulations and policies were summarized, and dismantling and pollution control technologies for ELV recycling were introduced, too. It was suggested that with the rapid growth of ELV quantities, more regulations will be enacted, and the recycling network will be more effective; the dismantling technology and pollution control measures will be upgraded, and the recycling and remanufacturing industries will be more combined. The government should pay more attention to improve the management and supervision of, and encourage the development of, high level enterprises. 相似文献
227.
Quantifying interactions between propranolol and dissolved organic matter (DOM) from different sources using fluorescence spectroscopy 总被引:1,自引:0,他引:1
Na Peng Kaifeng Wang Guoguang Liu Fuhua Li Kun Yao Wenying Lv 《Environmental science and pollution research international》2014,21(7):5217-5226
Beta blockers are widely used pharmaceuticals that have been detected in the environment. Interactions between beta blockers and dissolved organic matter (DOM) may mutually alter their environmental behaviors. To assess this potential, propranolol (PRO) was used as a model beta blocker to quantify the complexation with DOM from different sources using the fluorescence quenching titration method. The sources of studied DOM samples were identified by excitation–emission matrix spectroscopy (EEMs) combined with fluorescence regional integration analysis. The results show that PRO intrinsic fluorescence was statically quenched by DOM addition. The resulting binding constants (log K oc) ranged from 3.90 to 5.20, with the surface-water-filtered DOM samples claiming the lower log K oc and HA having the highest log K oc. Log K oc is negatively correlated with the fluorescence index, biological index, and the percent fluorescence response (P i,n) of protein-like region (P I,n) and the P i,n of microbial byproduct-like region (P II,n) of DOM EEMs, while it is correlated positively with humification index and the P i,n of UVC humic-like region (P III,n). These results indicate that DOM samples from allochthonous materials rich in aromatic and humic-like components would strongly bind PRO in aquatic systems, and autochthonous DOM containing high protein-like components would bind PRO more weakly. 相似文献
228.
Jingjing Deng Jie Guo Xiaoyu Zhou Peng Zhou Xiaoxu Fu Wei Zhang Kuangfei Lin 《Environmental science and pollution research international》2014,21(12):7656-7667
Various hazardous substances contained in waste TV sets might be released into environment via dust during recycling activities. Two brominated flame retardants (BFRs), polybrominated diphenyl ethers (PBDEs), and tetrabromobisphenol A (TBBPA), and five kinds of heavy metals (Cu, Pb, Cd, Cr, and Ni) were detected in indoor dust collected from two workshops (TV dismantling workshop and subsequent recycling workshop). PBDEs concentrations in dust from waste wires recycling line (722,000 ng/g) were the highest among the studied sites, followed by those in manual dismantling–sorting line (117,000 ng/g), whereas TBBPA concentrations were the highest in manual dismantling–sorting line (557 ng/g) and printed circuit board (PCB) recycling line (428 ng/g). For heavy metals, Cu and Pb were the most enriched metals in all dust samples. The highest concentration of Pb (22,900 mg/kg) was found in TV dismantling workshop-floor dust. Meanwhile, Cu was the predominant metal in dust from the PCB recycling line, especially in dust collected from electrostatic separation area (42,700 mg/kg). Occupational exposure assessment results showed that workers were the most exposed to BDE-209 among the four PBDE congeners (BDE-47, BDE-99, BDE-153, and BDE-209) in both workshops. The hazard quotient (HQ) indicated that noncancerous effects were unlikely for both BFRs and heavy metals (HQ?<?1), and carcinogenic risks for Cd, Cr, and Ni (risk?<?10?6) on workers in two workshops were relatively low. 相似文献
229.
Liang Peng Yanqing Ren Jidong Gu Pufeng Qin Qingru Zeng Jihai Shao Ming Lei Liyuan Chai 《Environmental science and pollution research international》2014,21(12):7631-7640
Novel magnetic carbonaceous bio-char was hydrothermal prepared from microalgae under different loadings of iron and its structures and surface chemistry were characterized with Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and nitrogen adsorption-desorption isotherm (BET). The morphology of bio-char changed from sheet to particle as iron loading increased and its surface area also increased. When 3.0 g of dried microalgae and 6.0 mmol iron salt ((NH4)2SO4·FeSO4·6H2O) were mixed and treated, the obtained bio-char possessing the highest amount of oxygen-containing functional groups resulted in the best adsorption performance on tetracycline (TC). This adsorption process was fitted to Langmuir adsorption isotherm and the maximum adsorption capacity was 95.86 mg/g, which is higher than other bio-char reported. The iron loading contributed to the higher adsorption capacity of bio-char, which may be due to three factors, the high surface area, more hydrogen bonding, and bridging effects of the structural Fe for TC. Our data suggest that bio-char may have more important role in stabilization of pollutants in the environment. 相似文献
230.
Hongyun Peng Yan Xing Lingling Gao Liang Zhang Guolin Zhang 《Environmental science and pollution research international》2014,21(13):8124-8132
Elsholtzia splendens is a copper-tolerant plant species which grows on copper deposits in China. The generation of a valuable E. splendens biomass on specific contaminated sites has become one of the promising phytotechnologies. The simultaneous separations of apigenin, luteolin, and rosmarinic acid yielded in the ethyl acetate extracts of the flowering aerial parts was achieved by the use of a macroporous resin, polyamide, and silicagel columns during chromatography. Chemical identification confirmed the structures based on the spectra of FTIR, NMR, and HPLC/ESI-MS. The isolated compounds of purity above 98.3 % were evaluated for their in vitro cytotoxic activities against human cancer cell lines including A549 (non-small lung), A431 (skin), and Bcap37 (breast). Among these compounds, luteolin and apigenin presented the best cytotoxic activities against A549, A431, and Bcap37 cells and, therefore, both could be the valuable products for the post-harvest processing of E. splendens biomass. 相似文献