全文获取类型
收费全文 | 221篇 |
免费 | 45篇 |
国内免费 | 224篇 |
专业分类
安全科学 | 13篇 |
废物处理 | 16篇 |
环保管理 | 9篇 |
综合类 | 326篇 |
基础理论 | 49篇 |
污染及防治 | 74篇 |
评价与监测 | 2篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 9篇 |
2022年 | 18篇 |
2021年 | 23篇 |
2020年 | 27篇 |
2019年 | 26篇 |
2018年 | 22篇 |
2017年 | 15篇 |
2016年 | 18篇 |
2015年 | 15篇 |
2014年 | 16篇 |
2013年 | 23篇 |
2012年 | 26篇 |
2011年 | 25篇 |
2010年 | 10篇 |
2009年 | 23篇 |
2008年 | 13篇 |
2007年 | 24篇 |
2006年 | 25篇 |
2005年 | 17篇 |
2004年 | 22篇 |
2003年 | 16篇 |
2002年 | 13篇 |
2001年 | 10篇 |
2000年 | 4篇 |
1999年 | 13篇 |
1998年 | 6篇 |
1997年 | 5篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 4篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 5篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1988年 | 1篇 |
排序方式: 共有490条查询结果,搜索用时 859 毫秒
311.
312.
研究了根生沉水植物菹草对富营养和重金属等污染的滇池水体和底泥的净化作用。结果表明,菹草对水体和底泥中的P、N、Pb、Zn、Cu、As有较大的吸收、富集量,单位生物量的菹草对N、Cu的富集量>水葫芦>茭草>芦苇,P、Zn则>茭草>芦苇;对底泥中N、P、Cu、Pb的吸收系数>水葫芦,尤以N、P为最显;研究还表明,植物对水体和底泥中污染物的富集量和净化效率与生物量大小有关,当菹草保持其群体覆盖率为50%时,生物量最大,净化效率也最大。 相似文献
313.
314.
介绍了一种处理导弹氧化剂废水的方法和工艺 ,用碱中和酸、尿素除NO- 2 、絮凝沉淀法除F- 和PO3- 4 ,探索了最佳处理条件 ,确定了较为合理的处理工艺 相似文献
315.
316.
317.
Kazuyoshi Matsunaga Motoichi Kondo Shinichi Yamabe Tadashige Mori 《Chemosphere》1993,27(12):2317-2324
PCBs were rapidly degraded by hydroxy radicals formed in the biomimetic degradation systems of superoxide, ferric chloride, and hydrogen peroxide at high concentrations below 100°C. The degradation rates of Kanechlor KC 300, KC 400, KC 500 and KC 600 were 95.4%, 89.1%, 59.9% and 47.9%, respectively. The generation of carbon dioxide gas was recognized and chloride ion showed 89.9 – 102.7% of the theoretical yield in the degradation of KC 300, KC 400 and KC 500. 相似文献
318.
Isabel W.C.E. Arends Jan G.P. Born W.Ren Ophorst Peter Mulder Robert Louw 《Chemosphere》1989,18(9-10):1965-1970
Pyrolysis (800–900°C, ca. 5 s) of benzene/HC1 mixtures leads to chlorobenzene (1) even in a reducing environment of H2 and/or CH4. With added oxygen, 1 is formed even at 550°C; such slow combustions also yield chlorinated phenols and dibenzofurans. 相似文献
319.
Degradation of diuron by the electro-Fenton process 总被引:2,自引:0,他引:2
Mohamed?C.?Edelahi Nihal?Oturan Mehmet?A.?OturanEmail author Yann?Padellec Alain?Bermond Kacem?El Kacemi 《Environmental Chemistry Letters》2003,1(4):233-236
The degradation of the herbicide diuron has been undertaken by electrochemical advanced oxidation in aqueous solution. This process generates catalytically hydroxyl radicals that are strong oxidizing reagents for the oxidation of organic substances. Hydroxyl radicals degrade diuron in less than 10 min. Kinetic results evidence a pseudo-first-order degradation, with a rate constant of reaction between diuron and hydroxyl radicals of 4.8x109 M–1 s–1. Several degradation products were identified by chromatography-mass spectrometry (LC-MS). The mineralization degree of a 1.7x10–4 M diuron solution reached 93% at 1,000 coulombs. 相似文献
320.
Removal of organophosphorus pesticides from water by electrogenerated Fenton's reagent 总被引:5,自引:0,他引:5
Elodie?Guivarch Nihal?Oturan Mehmet?A.?OturanEmail author 《Environmental Chemistry Letters》2003,1(3):165-168
Aqueous solutions of organophosphorus pesticides were completely mineralized via in-situ generated hydroxyl radicals (HO·) by the Electro-Fenton process. Formation of Fenton's reagent (H2O2, Fe2+) was carried out by simultaneous reduction of O2 and Fe3+ on carbon cathode in acidic medium. The electrochemistry combined with Fenton's reagent provides an excellent way to continuously produce the hydroxyl radical, a powerful oxidant. We demonstrate the efficiency of the Electro-Fenton process to degrade three organophosphorus insecticides: malathion, parathion ethyl and tetra-ethyl-pyrophosphate (TEPP). Degradation kinetics and removals of chemical oxygen demand (COD) have been investigated. Here we show that the mineralization efficiency was over 80% for three organophosphorus pesticides. 相似文献