全文获取类型
收费全文 | 1191篇 |
免费 | 134篇 |
国内免费 | 472篇 |
专业分类
安全科学 | 108篇 |
废物处理 | 109篇 |
环保管理 | 103篇 |
综合类 | 854篇 |
基础理论 | 235篇 |
污染及防治 | 227篇 |
评价与监测 | 117篇 |
社会与环境 | 32篇 |
灾害及防治 | 12篇 |
出版年
2024年 | 12篇 |
2023年 | 21篇 |
2022年 | 40篇 |
2021年 | 48篇 |
2020年 | 53篇 |
2019年 | 58篇 |
2018年 | 39篇 |
2017年 | 50篇 |
2016年 | 67篇 |
2015年 | 83篇 |
2014年 | 95篇 |
2013年 | 126篇 |
2012年 | 111篇 |
2011年 | 112篇 |
2010年 | 88篇 |
2009年 | 81篇 |
2008年 | 71篇 |
2007年 | 85篇 |
2006年 | 102篇 |
2005年 | 53篇 |
2004年 | 52篇 |
2003年 | 50篇 |
2002年 | 41篇 |
2001年 | 51篇 |
2000年 | 41篇 |
1999年 | 20篇 |
1998年 | 22篇 |
1997年 | 28篇 |
1996年 | 15篇 |
1995年 | 22篇 |
1994年 | 9篇 |
1993年 | 10篇 |
1992年 | 9篇 |
1991年 | 8篇 |
1990年 | 8篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 4篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1972年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有1797条查询结果,搜索用时 62 毫秒
991.
将粉煤灰进行碱激发改性,运用XRD和SEM技术对碱激发粉煤灰进行了表征,通过静态平衡吸附实验研究了碱激发粉煤灰对Cs+的吸附动力学和热力学特性,并对吸附前后的碱激发粉煤灰进行了FTIR分析。表征结果显示,碱激发处理后,粉煤灰的晶相发生了改变,且粉煤灰表面密实的硬壳层被破坏。实验结果表明:在初始Cs+质量浓度为200 mg/L、吸附温度为25℃、溶液pH为10、碱激发粉煤灰投加量为12.0 g/L的条件下,碱激发粉煤灰对Cs+的平衡吸附率可达80%以上,其吸附能力比碱激发前提高了3倍以上;吸附过程可用准二阶动力学方程来描述,并较好地符合Langmuir等温吸附模型;碱激发粉煤灰对Cs+的吸附是吸热过程,且能自发进行;该过程以物理吸附为主,并伴随化学吸附。 相似文献
992.
993.
994.
Ning Qin Wei HeXiang-Zhen Kong Wen-Xiu LiuQi-Shuang He Bin YangHui-Ling Ouyang Qing-Mei WangFu-Liu Xu 《Chemosphere》2013
The residual levels of polycyclic aromatic hydrocarbons (PAHs) in the atmosphere and in dissolved phase from Lake Chaohu were measured by (GC–MS). The composition and seasonal variation were investigated. The diffusive air–water exchange flux was estimated by a two-film model, and the uncertainty in the flux calculations and the sensitivity of the parameters were evaluated. The following results were obtained: (1) the average residual levels of all PAHs (PAH16) in the atmosphere from Lake Chaohu were 60.85 ± 46.17 ng m−3 in the gaseous phase and 14.32 ± 23.82 ng m−3 in the particulate phase. The dissolved PAH16 level was 173.46 ± 132.89 ng L−1. (2) The seasonal variation of average PAH16 contents ranged from 43.09 ± 33.20 ng m−3 (summer) to 137.47 ± 41.69 ng m−3 (winter) in gaseous phase, from 6.62 ± 2.72 ng m−3 (summer) to 56.13 ± 22.99 ng m−3 (winter) in particulate phase, and 142.68 ± 74.68 ng L−1 (winter) to 360.00 ± 176.60 ng L−1 (summer) in water samples. Obvious seasonal trends of PAH16 concentrations were found in the atmosphere and water. The values of PAH16 for both the atmosphere and the water were significantly correlated with temperature. (3) The monthly diffusive air–water exchange flux of total PAH16 ranged from −1.77 × 104 ng m−2 d−1 to 1.11 × 105 ng m−2 d−1, with an average value of 3.45 × 104 ng m−2 d−1. (4) The results of a Monte Carlo simulation showed that the monthly average PAH fluxes ranged from −3.4 × 103 ng m−2 d−1 to 1.6 × 104 ng m−2 d−1 throughout the year, and the uncertainties for individual PAHs were compared. (5) According to the sensitivity analysis, the concentrations of dissolved and gaseous phase PAHs were the two most important factors affecting the results of the flux calculations. 相似文献
995.
Hrönn Jörundsdóttir Karin Löfstrand Jörundur Svavarsson Anders Bignert Åke Bergman 《Chemosphere》2013
Data on distribution, concentration and trends of polybrominated diphenyl ethers (PBDEs) and hexabromocyclododecanes (HBCDs) is scarce in biota from the sub-Arctic region of the Atlantic. The present study is an investigation on PBDE and HBCD concentrations in eggs from seven marine bird species from Iceland, i.e. common eider (Somateria mollissima), arctic tern (Sterna paradisaea), guillemot (Uria aalge), fulmar (Fulmarus glacialis), lesser black-backed gull (Larus fuscus), great black-backed gull (Larus marinus) and great skua (Stercorarius skua). Concentrations of sum PBDEs ranged from 44 ng g−1 fat in eider eggs to 2400 ng g−1 fat in great skua eggs. The contribution of different PBDE congeners to the sum concentration differed between species. Concentration of HBCDs (sum of α−,β− and γ−HBCD) ranged from 1.3 ng g−1 fat in arctic tern eggs to 41 ng g−1 fat in great black-backed gull. PCA on PBDE and HBCD shows different trends between the two BFR groups, further indicating different sources/usage. Investigations on any potential health or population effects of environmental pollutants on the great skua are advised since both the PBDE and HBCD concentrations are high. 相似文献
996.
Aerobic biodegradation of decabromodiphenyl ether (PBDE-209) by Pseudomonas aeruginosa under the influence of co-metabolic substrates and heavy metal cadmium ion was studied, The results showed that certain amount of co-metabolic substrates, such as glucose, sucrose, lactose, starch, and beef extract, would promote the biodegradation of PBDE-209, among which glucose most favorably accelerated PBDE-209 degradation by about 36% within 5 d. The highest degradation efficiency was reached at the ratio of PBDE-209 and glucose 1:5 while excessive carbon source would actually hamper the degradation efficiency. Exploration of influences of cadmium ion on PBDE-209 biodegradation indicated that degradation efficiency was stimulated at low concentrations of Cd2+ (0.5–2 mg L−1) while inhibited at higher levels (5–10 mg L−1), inferring that the heavy metals of different concentrations possessed mixed reactions on PBDE-209 bioremoval. Bromine ion was produced during the biotransformation process and its concentration had a good negative correlation with the residues of PBDE-209. Two nonabromodiphenyl ethers (PBDE-208, PBDE-207), four octabromodiphenyl ethers (PBDE-203, PBDE-202, PBDE-197, PBDE-196) and one heptabromodiphenyl ethers (PBDE-183) were formed with the decomposition of PBDE-209, demonstrating that the main aerobic transformation mechanism of PBDE-209 was debromination. 相似文献
997.
采用可见光分解(光解)-氯碱氧化法去除模拟废水中的Fe(CN)63-。考察了光解过程中反应时间、初始Fe(CN)63-质量浓度和初始废水pH对Fe(CN)63-去除效果及表观反应速率常数(k(Fe(CN)63-))的影响,以及光解-氯碱氧化法对Fe(CN)63-模拟废水中总氰化物(TCN)的去除效果。实验结果表明:在初始Fe(CN)63-质量浓度6.7 mg/L、初始废水pH 12、反应时间8.0 h的条件下,Fe(CN)63-的去除率为83%,光解过程符合表观一级动力学模型;在初始Fe(CN)63-质量浓度6.7 mg/L、初始TCN质量浓度4.90 mg/L、初始废水pH 12、反应时间12.0 h的条件下,采用光解-氯碱氧化法可使Fe(CN)63-模拟废水的TCN质量浓度降至0.14 mg/L,低于GB 16171—2012的要求(0.2 mg/L),该过程的限速步骤为Fe(CN)63-的光解破络过程。 相似文献
998.
以玉米淀粉为载体,采用液相还原法制备纳米零价铁/玉米淀粉,并用于溶液中Pb2+的去除。采用SEM技术对吸附材料进行了表征。考察了溶液pH、纳米零价铁/玉米淀粉加入量、初始Pb2+质量浓度、反应时间等因素对Pb2+吸附效果的影响。表征结果显示,纳米零价铁/玉米淀粉球体间主要呈链状连接,不仅保持了纳米零价铁的特性,且颗粒的团聚现象明显减少。实验结果表明,在溶液pH 7.0、纳米零价铁/玉米淀粉加入量0.8 g/L、初始Pb2+质量浓度50 mg/L、反应时间60 min的条件下,纳米零价铁/玉米淀粉对Pb2+具有较好的吸附效果,Pb2+去除率为93.17%、吸附量为47.27 mg/g。 相似文献
999.
1000.
通过利用湖北省气象服务中心在全省27个旅游景区内建设的30个大气负氧离子自动监测站数据,对湖北省旅游景区大气负氧离子浓度分布特征及气象条件对负氧离子浓度的影响进行了分析。研究表明:湖北省旅游景区的大气负氧离子资源十分丰富,西部山区高于东部平原地区,整体呈现从东向西、从北向南逐渐增加的趋势,鄂西南地区为全省大气负氧离子最为丰富的地区,负氧离子浓度夏季最高,冬季最低,秋季略大于春季。从3月开始,负氧离子浓度逐月增加,至8月达到最大值,后又逐渐减小。凌晨和上午的负氧离子浓度要大于下午和晚上,夜间呈逐渐上升的趋势。大气负氧离子浓度晴天最大,阴天小于晴天,而雾霾天和小雨天负氧离子浓度均较小;中雨以上降水、闪电活动与负氧离子浓度呈正相关。 相似文献