全文获取类型
收费全文 | 1109篇 |
免费 | 104篇 |
国内免费 | 424篇 |
专业分类
安全科学 | 82篇 |
废物处理 | 60篇 |
环保管理 | 106篇 |
综合类 | 689篇 |
基础理论 | 215篇 |
环境理论 | 1篇 |
污染及防治 | 339篇 |
评价与监测 | 52篇 |
社会与环境 | 47篇 |
灾害及防治 | 46篇 |
出版年
2024年 | 4篇 |
2023年 | 26篇 |
2022年 | 70篇 |
2021年 | 63篇 |
2020年 | 54篇 |
2019年 | 57篇 |
2018年 | 58篇 |
2017年 | 62篇 |
2016年 | 59篇 |
2015年 | 75篇 |
2014年 | 92篇 |
2013年 | 122篇 |
2012年 | 103篇 |
2011年 | 70篇 |
2010年 | 61篇 |
2009年 | 65篇 |
2008年 | 80篇 |
2007年 | 47篇 |
2006年 | 51篇 |
2005年 | 33篇 |
2004年 | 28篇 |
2003年 | 18篇 |
2002年 | 37篇 |
2001年 | 34篇 |
2000年 | 32篇 |
1999年 | 35篇 |
1998年 | 32篇 |
1997年 | 24篇 |
1996年 | 24篇 |
1995年 | 24篇 |
1994年 | 26篇 |
1993年 | 17篇 |
1992年 | 18篇 |
1991年 | 7篇 |
1990年 | 11篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1981年 | 4篇 |
排序方式: 共有1637条查询结果,搜索用时 31 毫秒
961.
室内空气中多环芳烃污染的测量和特征性研究 总被引:20,自引:0,他引:20
本文就室内空气中多环芳烃典型污染源-室内燃煤和室内吸烟排放的多环芳烃组成和含量进行了测定,并同室外大气(对照)中多环芳烃组成含量进行了对比,研究了室内环境不同污染源排放多环烃组成和含量的特征性,结果表明,室内燃煤污染同燃煤型室外大气源排放多环芳烃具有相似组成含量特征,而室朵烟草烟雾污染源的多环芳烃组成含量特征,则与室外煤型和交通型均有显著区别。 相似文献
962.
有机污染物对藻类毒性的测定 总被引:19,自引:0,他引:19
藻类是研究水生毒理学的很好的材料之一,对其毒性是评价化合物危害的基本数据,也是研究化合物结构与生物效应的手段之一,通过测定工业废水,数种硝基芳烃及多种有机锡对藻类的毒性,发现剂量与效应时间有很好的相关性,化合物结构与效应之间也有一定的规律。 相似文献
963.
两级常温厌氧—好氧—固定化微生物组合工艺处理酿酒废水 总被引:1,自引:0,他引:1
酿酒废水是一种典型的高氨氮浓度的有机废水.采用两级常温厌氧-好氧-固定化微生物组合工艺对酿酒废水进行中试研究,重点考察了各级工艺对有机物和氨氮的去除效果,并且对影响系统稳定运行的主要因素进行分析.试验结果表明,稳定运行状态下,一级厌氧膨胀颗粒污泥床(EGSB)反应器对有机物去除率可达到70%~90%,处理效果受环境温度影响较大;二级EGSB反应器可以同时去除有机物和氮氧化物;三级好氧接触氧化反应器对有机物的去除率可达到70%,氨氮去除率维持在50%;包埋硝化菌流化床反应器最终能有效地去除水中的氨氮,出水氨氮质量浓度低于15 mg/L. 相似文献
964.
Treatment performance and microorganism community structure of integrated vertical-flow constructed wetland plots for domestic wastewater 总被引:2,自引:0,他引:2
Su-qing Wu Jun-jun Chang Yanran Dai Zhen-bin Wu Wei Liang 《Environmental science and pollution research international》2013,20(6):3789-3798
In order to investigate the treatment performance and microorganism mechanism of IVCW for domestic wastewater in central of China, two parallel pilot-scale IVCW systems were built to evaluate purification efficiencies, microbial community structure and enzyme activities. The results showed that mean removal efficiencies were 81.03 % for COD, 51.66 % for total nitrogen (TN), 42.50 % for NH4 +-N, and 68.01 % for TP. Significant positive correlations between nitrate reductase activities and TN and NH4 +-N removal efficiencies, along with a significant correlation between substrate enzyme activity and operation time, were observed. Redundancy analysis demonstrated gram-negative bacteria were mainly responsible for urease and phosphatase activities, and also played a major role in dehydrogenase and nitrate reductase activities. Meanwhile, anaerobic bacteria, gram-negative bacteria, and saturated FA groups, gram-positive bacteria exhibited good correlations with the removal of COD (p?=?0.388), N (p?=?0.236), and TP (p?=?0.074), respectively. The IVCW system can be used to treat domestic wastewater effectively. 相似文献
965.
966.
967.
968.
Pan B Xing B Tao S Liu W Lin X Xiao Y Dai H Zhang X Zhang Y Yuan H 《Chemosphere》2007,68(7):1262-1269
The sorption coefficient, K(OC), of phenanthrene (PHE) has been reported to vary with different types of organic matter, leading to uncertainties in predicting the environmental behavior of PHE. Among the studies that relate organic matter properties to their sorption characteristics, physical conformation of organic matter is often neglected. In this work, organic matter samples of different physical forms were examined for their sorption characteristics. Dissolved humic acids (DHA) showed significantly higher K(OC) than the corresponding solid humic acids (SHA) from which the DHAs were made. The K(OC) of DHAs was found to be related to polarity, whereas K(OC) of SHAs increased with aliphatic carbon content. Soil particles were treated with H(2)O(2) to remove organic matter, and humic acid was coated on H(2)O(2)-treated soil particles to make organo-mineral complexes at pH 4, 7 and 10. Although the nonlinear sorption was apparent for SHAs and H(2)O(2)-treated soil particles, the organo-mineral complexes formed using these two components at pH 4, 7 and 10 exhibited relatively linear sorption at organic carbon content, f(OC)>0.5%. These results indicate that organic matter of the same composition may have different sorption properties due to different physical forms (or conformations). Nonlinear sorption for the complexes formed at pH 4 with lower f(OC) (<0.5%) was also discussed. 相似文献
969.
Wet precipitation chemistry at a high-altitude site (3,326 m a.s.l.) in the southeastern Tibetan Plateau 总被引:1,自引:0,他引:1
Bin Liu Shichang Kang Jimin Sun Yulan Zhang Ri Xu Yongjie Wang Yongwen Liu Zhiyuan Cong 《Environmental science and pollution research international》2013,20(7):5013-5027
This paper presents the results of wet precipitation chemistry from September 2009 to August 2010 at a high-altitude forest site in the southeastern Tibetan Plateau (TP). The alkaline wet precipitation, with pH ranging from 6.25 to 9.27, was attributed to the neutralization of dust in the atmosphere. Wet deposition levels of major ions and trace elements were generally comparable with other alpine and remote sites around the world. However, the apparently greater contents/fluxes of trace elements (V, Co, Ni, Cu, Zn, and Cd), compared to those in central and southern TP and pristine sites of the world, reflected potential anthropogenic disturbances. The almost equal mole concentrations and perfect linear relationships of Na+ and Cl? suggested significant sea-salts sources, and was confirmed by calculating diverse sources. Crust mineral dust was responsible for a minor fraction of the chemical components (less than 15 %) except Al and Fe, while most species (without Na+, Cl?, Mg2+, Al, and Fe) arose mainly from anthropogenic activities. High values of as-K+ (anthropogenic sources potassium), as-SO4 2?, and as-NO3 ? observed in winter and spring demonstrated the great effects of biomass burning and fossil fuel combustion in these seasons, which coincided with haze layer outburst in South Asia. Atmospheric circulation exerted significant influences on the chemical components in wet deposition. Marine air masses mainly originating from the Bay of Bengal provided a large number of sea salts to the chemical composition, while trace elements during summer monsoon seasons were greatly affected by industrial emissions from South Asia. The flux of wet deposition was 1.12 kg?N?ha?1?year?1 for NH4 +–N and 0.29 kg?N?ha?1?year?1 for NO3 ?–N. The total atmospheric deposition of N was estimated to be 6.41 kg?N?ha?1?year?1, implying potential impacts on the alpine ecosystem in this region. 相似文献
970.
天津经济技术开发区(TEDA)环境预警系统的建立研究 总被引:9,自引:0,他引:9
本文通过对警系统的分析,指出环境预警系统是多目标系统,其包含对某一时点和某段时间变化 趋势的报警。 相似文献