全文获取类型
收费全文 | 8190篇 |
免费 | 504篇 |
国内免费 | 2665篇 |
专业分类
安全科学 | 671篇 |
废物处理 | 436篇 |
环保管理 | 604篇 |
综合类 | 4604篇 |
基础理论 | 1310篇 |
环境理论 | 2篇 |
污染及防治 | 2518篇 |
评价与监测 | 382篇 |
社会与环境 | 394篇 |
灾害及防治 | 438篇 |
出版年
2024年 | 12篇 |
2023年 | 144篇 |
2022年 | 429篇 |
2021年 | 332篇 |
2020年 | 274篇 |
2019年 | 240篇 |
2018年 | 319篇 |
2017年 | 340篇 |
2016年 | 379篇 |
2015年 | 431篇 |
2014年 | 608篇 |
2013年 | 796篇 |
2012年 | 714篇 |
2011年 | 761篇 |
2010年 | 586篇 |
2009年 | 533篇 |
2008年 | 545篇 |
2007年 | 498篇 |
2006年 | 507篇 |
2005年 | 361篇 |
2004年 | 259篇 |
2003年 | 251篇 |
2002年 | 268篇 |
2001年 | 232篇 |
2000年 | 258篇 |
1999年 | 214篇 |
1998年 | 202篇 |
1997年 | 174篇 |
1996年 | 158篇 |
1995年 | 123篇 |
1994年 | 95篇 |
1993年 | 74篇 |
1992年 | 75篇 |
1991年 | 41篇 |
1990年 | 44篇 |
1989年 | 20篇 |
1988年 | 14篇 |
1987年 | 14篇 |
1986年 | 7篇 |
1985年 | 6篇 |
1984年 | 3篇 |
1983年 | 5篇 |
1982年 | 3篇 |
1981年 | 5篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
泸沽湖沉积物-水界面扩散作用对上覆水体基本化学组成的影响 总被引:2,自引:2,他引:2
通过云南泸沽湖--半封闭深水湖泊湖水和沉积物孔隙中Ca^2+、K^+、Na^+、HCO3等基本组分及PH等剖面分布的研究,结果表明,这些基本组分可以自底部沉积物向上覆体扩散迁移,定量地估算了扩散通量及其对上覆水体的影响程度,说明湖泊沉积物-水界面作用在控制整个水体水化学基本组成中的起着重要的作用。 相似文献
142.
143.
This paper deals with the release of base cations and Al3+ at the treatment with simulated acid rain (SAR) in main soil types collected from South China. Results showed that the amounts of base cations increased obviously when the pH value of simulated acid rain was lower than 3.0 or 3.5. Compared with the leaching of K+ and Na+, the leaching of Ca2+ and Mg2+ was affected by the pH value of SAR. Only when the amounts of base cations leached from soils exceeded the cation exchange capacity, the pH value of leaching solutions decreased sharply and the amounts of released Al3+ increased. The H+ buffering mechanisms, which were affected notonly by the pH values of SAR, but also by the types and solid components of soils, were proposed for the main soils studied. 相似文献
144.
145.
环境监测作为环境管理的重要手段之一,在经济发展过程中,我们应了解环境监测在经济建设中的地位和作用,充分有效的利用环境监测的成果,使之为经济发展服务。 相似文献
146.
Yongfeng Ji Zidan Yuan Guoqing Zhang Xing Wu Xu M Jinru Lin Shaofeng Wang 《环境科学学报(英文版)》2023,35(2):31-41
An advanced cost-saving method of removal of high-As(Ⅲ) from SO4(-Ⅱ)-rich metallurgi cal wastewater has been developed by diluting the SO4(-Ⅱ) content with As(Ⅲ)-Cl(-Ⅰ)-rich metallurgical wastewater and then by the direct precipitation of As(Ⅲ) with Fe(Ⅲ) at pH2.3.As(Ⅲ) removal at various SO4(-Ⅱ)/Cl(-Ⅰ) molar ratios and temperatures was investigated The results showed that 65.2–98.2%of As(III) immobilization into solids occurred at the SO4(Ⅱ)/Cl(-Ⅰ) mo... 相似文献
147.
The feasibility of decomplexation removal of typical contaminants in electroplating wastewater, complexed Cu(II) with 1-hydroxyethylidene-1,1-diphosphonic acid (Cu-HEDP), was first performed by a three-dimensional electric
reactor with activated biochar as particle electrodes. For the case of 50 mg/L Cu-HEDP, Cu(II) removal (90.7%) and PO
initial pH 7, acid-treated almond shell biochar (AASB) addition 20 g/L, and reaction time 180 min, with second-order rate constants of 1.10 × 10−3 and 1.94 × 10−5 min−1respectively. The growing chelating effect between Cu(II) and HEDP and the comprehensive actions of adsorptive accumulation, direct and indirect oxidation given by particle electrodes accounted for the enhanced removal of Cu-HEDP, even though the mineralization of HEDP was mainly dependent on anode oxidation. The performance attenuation of AASB particle electrodes was ascribed to the excessive consumption of oxygen-containing functionalities during the reaction, especially acidic carboxylic groups and quinones on particle electrodes, which decreased from 446.74 to 291.48 µmol/g, and 377.55 to 247.71 µmol/g, respectively. Based on the determination of adsorption behavior and indirect electrochemical oxidation mediated by in situ electrogenerated H2O2 and reactive oxygen species (e.g., •OH), a possible removal mechanism of Cu-HEDP by three-dimensional electrolysis was further proposed. 相似文献
148.
149.
150.