全文获取类型
收费全文 | 1643篇 |
免费 | 69篇 |
国内免费 | 619篇 |
专业分类
安全科学 | 133篇 |
废物处理 | 96篇 |
环保管理 | 130篇 |
综合类 | 941篇 |
基础理论 | 277篇 |
污染及防治 | 583篇 |
评价与监测 | 51篇 |
社会与环境 | 46篇 |
灾害及防治 | 74篇 |
出版年
2024年 | 1篇 |
2023年 | 27篇 |
2022年 | 76篇 |
2021年 | 65篇 |
2020年 | 48篇 |
2019年 | 33篇 |
2018年 | 57篇 |
2017年 | 82篇 |
2016年 | 73篇 |
2015年 | 74篇 |
2014年 | 128篇 |
2013年 | 155篇 |
2012年 | 168篇 |
2011年 | 121篇 |
2010年 | 111篇 |
2009年 | 109篇 |
2008年 | 121篇 |
2007年 | 107篇 |
2006年 | 93篇 |
2005年 | 75篇 |
2004年 | 35篇 |
2003年 | 60篇 |
2002年 | 61篇 |
2001年 | 46篇 |
2000年 | 44篇 |
1999年 | 62篇 |
1998年 | 51篇 |
1997年 | 46篇 |
1996年 | 42篇 |
1995年 | 40篇 |
1994年 | 26篇 |
1993年 | 25篇 |
1992年 | 21篇 |
1991年 | 14篇 |
1990年 | 5篇 |
1989年 | 7篇 |
1988年 | 11篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
排序方式: 共有2331条查询结果,搜索用时 15 毫秒
21.
为了选择适合小城镇潜流人工湿地的填料,选取小城镇较为常见的材料(废砖、卵石、碎石),结合物化性质,研究25℃下填料对磷的吸附效果,并分析了填料种类对野外潜流人工湿地运行的影响。结果表明:(1)25℃时,3种填料对磷的吸附量随着溶液中初始磷浓度的增加而增加,吸附能力依次为废砖>碎石>卵石;(2)野外潜流人工湿地运行过程中,随HRT的延长,组合填料湿地WL1和废砖填料WL2湿地对总磷的净化效果有所提高,且WL2湿地对总磷的去除效果略优于WL1。因此,可以选择废砖作为小城镇潜流人工湿地系统的填料。 相似文献
22.
加热和亚铁离子活化过硫酸钠氧化降解4-CP的研究 总被引:9,自引:3,他引:6
通过加热和亚铁离子2种方法活化过硫酸钠产生强氧化性的硫酸根自由基,利用硫酸根自由基氧化难降解有机污染物.以对氯苯酚(4-CP)为目标污染物,研究了温度、pH值、亚铁离子浓度、过硫酸钠浓度、柠檬酸浓度对4-CP降解率的影响.结果表明,升高温度可以显著地提高4-CP降解率.反应4h后,在30℃,4-CP降解率只有2.5%;在50℃,4-CP降解率能够达到43.5%;而在60℃,4-CP降解率为100%.pH值对4-CP降解率的影响较大,依次为pH4.0pH7.0pH10.0.在室温下,亚铁离子是促使4-CP降解的必要条件,并且对反应条件进行了优化,分子探针实验证实了硫酸根自由基的存在.在过硫酸钠/亚铁离子体系加入适量的柠檬酸能够有效利用溶液中的亚铁离子,在等量的过硫酸钠存在条件下,常温下过硫酸钠/亚铁离子/柠檬酸体系对4-CP降解率为50.9%,优于50℃下过硫酸钠体系对4-CP降解率43.5%. 相似文献
23.
Liangliang Wei Kun Wang Qingliang Zhao Junqiu Jiang Chunmei Xie Wei Qiu 《环境科学学报(英文版)》2010,22(5):641-647
In order to characterize the organic properties of waste activated sludge in a wastewater treatment plant,organic matter within sludge was extracted with NH 3 ·H 2 O preferentially,and subsequently fractionated into five fractions using XAD-8/XAD-4 resins.Up to a 63.8%-71.1% of organic matter within the sludge could be efficiently extracted by NH 3 ·H 2 O.Fractionation results showed that hydrophobic acid and hydrophilic fraction were two main components among the sludge organic matter (accounting for 32.2% and 48.0% of the bulk organic matter,respectively),whereas transphilic acid,hydrophobic neutral and transphilic neutral were quite low (accounting for 9.2%,5.8% and 4.8%,respectively).Despite that the extractant of NH 3 ·H 2 O showed a relatively higher extraction efficiency of the aromatic components,the relatively low aromaticity of the organic fractions implied that those non-aromatic components could also be effectively extracted,especially for neutral and hydrophilic fractions.In addition,acidic fractions contained more aromatic humic-like components,whereas the neutral fractions had a greater content of aromatic proteins and soluble microbial byproduct-like components.Extraction of sludge organics with NH 3 ·H 2 O and subsequential fractionation using XAD resins could be a novel method for further characterization of sludge organics. 相似文献
24.
“平衡”是世间万物之本,而生态健康却与自然、社会、政治以及人体平衡等有着千丝万缕的联系。随着人类社会经济的不断发展和人们生活水平的不断提高,生态健康已成为现代化生活的一个重要标志,它直接关系到人们的健康生活。本文提出了“平衡”是生态健康之本,从一个新颖的视角一“平衡”,简明地论述了平衡在人类的生存发展过程中的重要性,以及它与生态健康之间的密切关系。文章中阐述的观点值得思考,对如何理解和审视“生态健康”有着重要的启示作用。 相似文献
25.
Youzhi Li Canming Zhang Yonghong Xie Fen Liu 《Mitigation and Adaptation Strategies for Global Change》2009,14(6):537-545
Deyeuxia angustifolia is a dominant species in the Sanjiang Plain, the largest freshwater marsh wetland in China. However, this species has declined
because of great environment changes. In the effects of sea-level rise and greenhouse gas, magnitude and frequency of flood
and rate of deposit in wetland increased greatly. Thus, in this paper, effects of soil environment (soil type, burial depth,
water depth and oxygen concentration) on seed germination of D. angustifolia were investigated. Both soil type and burial depth affected seedling emergence. Seedlings emerged through 1-, 2-, 4-mm sand,
and at 1-and 2-mm mud. Regardless of soil, seedling emergence time increased and emergence percentage decreased with increasing
burial depth. For example, seedlings started to emerge on the 4th day and the final emergence percentage was 30% when covered
with1-mm mud, whereas the initial emergence time was on the 6th day and the final emergence percentage was only 8% when covered
with 2-mm mud. At the same burial depth, emergence percentage was higher in sand than in mud. Increasing water depth inhibited
seed germination. Germination percentage in 2-cm water level (20%) was 1.2 times higher than that in 12-cm water level (9%).
Oxygen concentration also affected germination. In the 21% oxygen concentration, germination was started on the 2nd day and
the germination percentage was 36%, while seed started to germinate on the 4th day and the germination percentage was only
3% at the 7% oxygen concentration. These data indicate that seed germination of D. angustifolia was highly sensitive to soil type, burial depth, water depth, oxygen concentration, and these responses may be an explicit
indication of maladjustment to environment changes, and an important reason accounting for the decline of this species in
the Sanjiang Plain. 相似文献
26.
石化生产装置微量泄漏检测方法及应用 总被引:2,自引:0,他引:2
以石化装置为例介绍了生产装置微量泄漏的含义、适用的检测仪器种类以及泄漏检测的具体做法。通过实际检测数据的分析。说明了微量泄漏检测对设备管理、工艺改造的促进作用。 相似文献
27.
28.
环糊精在土壤有机污染物治理中的应用 总被引:2,自引:0,他引:2
综述了环糊精及其衍生物在土壤弱极性有机物治理中的应用和原理。环糊精可与土壤中弱极性有机污染物形成主客包合物,从而增加其水溶性促进其从土壤中解吸去除;能够同时去除金属离子;能够改变有机污染物理化性质促进其光解;可降低有机污染物毒性促进其微生物降解。 相似文献
29.
30.
Determination of polyfluoroalkyl compounds in water and suspended particulate matter in the river Elbe and North Sea, Germany 总被引:1,自引:0,他引:1
Lutz Ahrens Merle Plassmann Zhiyong Xie Ralf Ebinghaus 《Frontiers of Environmental Science & Engineering in China》2009,3(2):152-170
The distribution of polyfluoroalkyl compounds (PFCs) in the dissolved and particulate phase and their discharge from the river
Elbe into the North Sea were studied. The PFCs quantified included C4-C8 perfluorinated sulfonates (PFSAs), 6:2 fluorotelomer sulfonate (6:2 FTS), C6 and C8 perfluorinated sulfinates (PFSiAs), C4-C12 perfluorinated carboxylic acids (PFCAs), perfluoro-3,7-dimethyl-octanoic acid (3,7m2-PFOA), perfluorooctane sulfonamide (FOSA), and n-ethyl perfluroctane sulfonamidoethanol (EtFOSE). PFCs were mostly distributed
in the dissolved phase, where perfluorooctanoic acid (PFOA) dominated with 2.9–12.5 ng/L. In the suspended particulate matter
FOSA and perfluorooctane sulfonate (PFOS) showed the highest concentrations (4.0 ng/L and 2.3 ng/L, respectively). The total
flux of ΣPFCs from the river Elbe was estimated to be 802 kg/year for the dissolved phase and 152 kg/year for the particulate
phase. This indicates that the river Elbe acts as a source of PFCs into the North Sea. However, the concentrations of perfluorobutane
sulfonate (PFBS) and perfluorobutanoic acid (PFBA) in the North Sea were higher than that in the river Elbe, thus an alternative
source must exist for these compounds. 相似文献