全文获取类型
收费全文 | 1542篇 |
免费 | 88篇 |
国内免费 | 668篇 |
专业分类
安全科学 | 92篇 |
废物处理 | 98篇 |
环保管理 | 92篇 |
综合类 | 950篇 |
基础理论 | 292篇 |
污染及防治 | 583篇 |
评价与监测 | 70篇 |
社会与环境 | 59篇 |
灾害及防治 | 62篇 |
出版年
2024年 | 2篇 |
2023年 | 20篇 |
2022年 | 87篇 |
2021年 | 69篇 |
2020年 | 54篇 |
2019年 | 51篇 |
2018年 | 62篇 |
2017年 | 62篇 |
2016年 | 70篇 |
2015年 | 84篇 |
2014年 | 117篇 |
2013年 | 139篇 |
2012年 | 143篇 |
2011年 | 140篇 |
2010年 | 102篇 |
2009年 | 88篇 |
2008年 | 87篇 |
2007年 | 91篇 |
2006年 | 96篇 |
2005年 | 63篇 |
2004年 | 61篇 |
2003年 | 63篇 |
2002年 | 48篇 |
2001年 | 58篇 |
2000年 | 65篇 |
1999年 | 55篇 |
1998年 | 59篇 |
1997年 | 48篇 |
1996年 | 48篇 |
1995年 | 41篇 |
1994年 | 26篇 |
1993年 | 21篇 |
1992年 | 17篇 |
1991年 | 7篇 |
1990年 | 12篇 |
1989年 | 6篇 |
1988年 | 5篇 |
1987年 | 4篇 |
1986年 | 5篇 |
1985年 | 2篇 |
1984年 | 4篇 |
1983年 | 7篇 |
1982年 | 4篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1978年 | 2篇 |
排序方式: 共有2298条查询结果,搜索用时 15 毫秒
991.
Pollution survey of polycyclic aromatic hydrocarbons in surface water of Hangzhou, China 总被引:8,自引:0,他引:8
The concentrations of 10 polycyclic aromatic hydrocarbons (PAHs) were simultaneously measured for five times (July and November 1999–2002) in four water bodies of Hangzhou, China. To investigate possible sources of PAH contamination, sediments, soils, runoff water and atmospheric particles of the region were also analyzed for their PAH contents. The maximum levels of PAHs in the water bodies (34.4–67.7 μg/l) were found in July, while significantly lower PAH concentrations (4.7–15.3 μg/l) were measured in November. The contamination is substantial and it may have resulted in acute toxic effects on aquatic organisms. The measured PAH concentrations in sediments and soils (224–4222 ng/g), runoff water (8.3 μg/l) and air particles (2.3 μg/m3) are discussed in relation to concentrations and patterns found in the surface water bodies. Comparison of PAH levels in sediments and soils led to the conclusion that the erosion of soil material does not contribute significantly to the contamination of sediments. The atmospheric PAH deposition to water bodies in the city area of Hangzhou was estimated to be 530 tons/a, while the contribution of surface runoff water was estimated to be 30.7 tons/a. The ratios of selected PAH were then used to illuminate the possible origin of PAHs in the examined samples (petrogenic, pyrogenic). 相似文献
992.
Acclimation of anaerobic sludge degrading chlorophenols and the biodegradation kinetics during acclimation period 总被引:10,自引:0,他引:10
The acclimation of sludge from Hangzhou citrate factory and Hangzhou municipal wastewater treatment plant for degradation dechlorination of chlorophenols (CPs) compounds, and its biodegradation kinetics were studied in batch process with or without addition of sucrose. Three monochlorophenols (2-CP; 3-CP; 4-CP) and pentachlorophenol (PCP) were concurrently fed to different bioreactors. The parameters that were monitored included biogas production, biogas composition and chemical oxygen demand (COD). The results showed that acclimation with chlorophenol can increase the degradation activity of anaerobic sludge and degradation rate of chlorophenolic compounds, and reduce the lag time. Degradation dechlorination activity of the acclimated sludge strongly depended on sludge source, microorganism population and chlorophenol congener. 2-CP was more easily acclimated than 3-CP and 4-CP. Among the four tested compounds, 4-CP was the most difficult to be acclimated. The observed degradation rate with presence of sucrose was higher than that with absence of sucrose, suggesting that addition of the external carbon source can stimulate the formation of acclimated sludge which could effectively degrade chlorophenols. Kinetic equations of biodegradation of chlorophenols were also presented in this paper. 相似文献
993.
994.
函数计算器程序计算功能简便易学,容易掌握,程序计算功能的深入开发,应用在一般的环境监测数据处理中,快速准确,非常便利。 相似文献
995.
二氧化硫对环境及人类的危害越来越严重,对其的治理是保护大气环境的重要方面。本文阐述了二氧化硫的污染现状以及治理二氧化硫烟气的主要方法,为烟气脱硫方法的选择提供参考。最后用综合治理二氧化硫污染的实例,说明了环境治理中要尽量采用“绿色技术”,变废为宝,体现环境保护的新思维,实现循环经济的发展要求。 相似文献
996.
997.
GUAN Ming ZHENG De |ming YU Ya |qin ZHAO Jie |xu BI Wen |xiang WU Di LING Jing DU Wei XIA Yu |Yong GAO Shen SUN Wei |wei GUAN Ci |nan WANG Yan |li 《环境科学学报(英文版)》2000,(Z1)
Inrecentyears,mercurycontaminationhasbeen paid greatattentiontoovertheworld(Zilloux ,1993;Monamy ,1993;Guan ,1994;Yang ,1992 ;Li,1993;1994;SCOPE ,1994) .TheprincipalfocusistodecreaseHgcontaminationinordertoprotecttheecosystemenvironmentandthehuman’shealth .Itisdifferentfrom“mi… 相似文献
998.
用凹凸棒石处理高浓含油废水的研究 总被引:8,自引:0,他引:8
研究了凹凸棒石吸附剂(包括其回收再生品)对废水中各种状态油的去除,结果表明,1%凹凸棒石原土与1mg/LPAM组合,可使含油约500mg/L的废水获得90%以上的除油率;若组合使用2.00%凹凸棒石和800mg/L硫酸铝,则易使含油126000mg/L的废乳化液破乳除油,除油率均达98%左右,COD_(Cr)去除率89%:如采用多级连续处理,则可有效地净化水质;油的去除效果是凹凸棒石投加量或初始油浓度的幂函数,且在剩余油量与投加量之间符合Freundlich吸附等温式:整个吸附过程具有不同特征的几个阶段,并随着时间的推延,逐渐呈现一级反应动力学的特征。 相似文献
999.
1000.
D301R树脂对铬(Ⅵ)的吸附性能研究 总被引:7,自引:0,他引:7
在pH=2.63的HAc-NaAc体系中,D301R树脂对Cr(Ⅵ)有较好的吸附性。树脂的静态饱和吸附容量为206mg/g。用 5%NH4CI和10%NH3·H2O的混合液能定量洗脱,测得吸附速率常数k298=2.52×10~(-4)/s。吸附过程遵守Freundlich等温式。298K 时测得吸附热力学参数△H=3.33kJ/mol、△G=-6.96kJ/mol、△S=34.5J/(mol·K)。树脂功能基与Cr(Ⅵ)的配位比为1:1。 相似文献