全文获取类型
收费全文 | 2203篇 |
免费 | 177篇 |
国内免费 | 390篇 |
专业分类
安全科学 | 607篇 |
废物处理 | 69篇 |
环保管理 | 239篇 |
综合类 | 1158篇 |
基础理论 | 285篇 |
污染及防治 | 140篇 |
评价与监测 | 115篇 |
社会与环境 | 65篇 |
灾害及防治 | 92篇 |
出版年
2024年 | 26篇 |
2023年 | 65篇 |
2022年 | 99篇 |
2021年 | 129篇 |
2020年 | 98篇 |
2019年 | 108篇 |
2018年 | 54篇 |
2017年 | 62篇 |
2016年 | 74篇 |
2015年 | 113篇 |
2014年 | 317篇 |
2013年 | 138篇 |
2012年 | 154篇 |
2011年 | 174篇 |
2010年 | 114篇 |
2009年 | 133篇 |
2008年 | 101篇 |
2007年 | 114篇 |
2006年 | 148篇 |
2005年 | 84篇 |
2004年 | 91篇 |
2003年 | 50篇 |
2002年 | 55篇 |
2001年 | 35篇 |
2000年 | 35篇 |
1999年 | 18篇 |
1998年 | 33篇 |
1997年 | 28篇 |
1996年 | 24篇 |
1995年 | 25篇 |
1994年 | 16篇 |
1993年 | 10篇 |
1992年 | 17篇 |
1991年 | 9篇 |
1990年 | 5篇 |
1989年 | 9篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
排序方式: 共有2770条查询结果,搜索用时 312 毫秒
111.
在pH为6.40的B-R缓冲溶液中,荧光桃红与一定浓度的溴化十六烷基三甲基胺发生荧光增强反应,加入有机磷农药后,体系的荧光强度降低,且降低程度与有机磷农药的加入量呈良好的线性关系,建立了用此荧光法来测定有机磷农药残留总量的新方法.在优化试验条件下,线性范围为0.008-0.72 mg·L-1,检出限为0.05 mg·L... 相似文献
112.
Shiping Zhou Changqun Duan Wong Hang Gi Michelle Fazhong Yang Xuehua Wang 《环境科学学报(英文版)》2011,23(4):676-680
Toxicities were assessed for a pyrethroid (cypermethrin) and an organophosphate insecticide (chlorpyrifos) individually and in
combination. A series of tests were conducted on di erent responses (acute, chronic, behavioral) of earthworms of species Eisenia
fetida andrei in the ecological risk assessment of these pesticides. The results showed that the toxicity of the mixture of cypermethrin
and chlorpyrifos was significantly higher than either of these pesticides individually, especially on the earthworm’s chronic responses.
At a concentration of 5 mg/kg, the mixture caused significant reductions on the growth and reproduction rates of earthworms, but did
not cause any significant e ect when the individual was tested. The increase in toxicity of the pesticide mixture means that the use of
toxicity data obtained exclusively from single-pesticide experiments may underestimate the ecological risk of pesticides that actually
present in the field. 相似文献
113.
Application of magnetic particles modified with amino groups to adsorb
copper ions in aqueous solution 总被引:1,自引:1,他引:0
A magnetic adsorbent can be easily recovered from treated water by magnetic force,without requiring further downstream treatment.In this research,amine-functionalized silica magnetite has been synthesized using N-[3-(trimethoxysilyl)propyl]-ethylenediamine(TPED) as a surface modification agent.The synthesized magnetic amine adsorbents were used to adsorb copper ions in an aqueous solution in a batch system,and the maximum adsorption was found to occur at pH 5.5 ± 0.1.The adsorption equilibrium data fitted t... 相似文献
114.
115.
116.
117.
118.
119.
120.
Xiuying Zhao Xinming Wang Xiang Ding Quanfu He Zhou Zhang Tengyu Liu Xiaoxin Fu Bo Gao Yunpeng Wang Yanli Zhang Xuejiao Deng Dui Wu 《环境科学学报(英文版)》2014,26(1):110-121
Organic acids as important constituents of organic aerosols not only influence the aerosols' hygroscopic property, but also enhance the formation of new particles and secondary organic aerosols. This study reported organic acids including C14–C32fatty acids, C4–C9dicarboxylic acids and aromatic acids in PM2.5collected during winter 2009 at six typical urban, suburban and rural sites in the Pearl River Delta region. Averaged concentrations of C14–C32fatty acids, aromatic acids and C4– C9 dicarboxylic acids were 157, 72.5 and 50.7 ng/m3, respectively. They totally accounted for 1.7% of measured organic carbon. C20–C32fatty acids mainly deriving from higher plant wax showed the highest concentration at the upwind rural site with more vegetation around, while C14–C18fatty acids were more abundant at urban and suburban sites, and dicarboxylic acids and aromatic acids except 1,4-phthalic acid peaked at the downwind rural site. Succinic and azelaic acid were the most abundant among C4–C9dicarboxylic acids, and 1,2-phthalic and 1,4-phthalic acid were dominant aromatic acids. Dicarboxylic acids and aromatic acids exhibited significant mutual correlations except for 1,4-phthalic acid, which was probably primarily emitted from combustion of solid wastes containing polyethylene terephthalate plastics. Spatial patterns and correlations with typical source tracers suggested that C14–C32fatty acids were mainly primary while dicarboxylic and aromatic acids were largely secondary. Principal component analysis resolved six sources including biomass burning, natural higher plant wax, two mixed anthropogenic and two secondary sources; further multiple linear regression revealed their contributions to individual organic acids. It turned out that more than 70% of C14–C18fatty acids were attributed to anthropogenic sources, about 50%–85% of the C20–C32fatty acids were attributed to natural sources, 80%–95% of dicarboxylic acids and 1,2-phthalic acid were secondary in contrast with that 81% of 1,4-phthalic acid was primary. 相似文献