全文获取类型
收费全文 | 3388篇 |
免费 | 24篇 |
国内免费 | 269篇 |
专业分类
安全科学 | 83篇 |
废物处理 | 168篇 |
环保管理 | 344篇 |
综合类 | 714篇 |
基础理论 | 1207篇 |
污染及防治 | 739篇 |
评价与监测 | 200篇 |
社会与环境 | 205篇 |
灾害及防治 | 21篇 |
出版年
2023年 | 15篇 |
2022年 | 25篇 |
2021年 | 29篇 |
2020年 | 19篇 |
2019年 | 29篇 |
2018年 | 133篇 |
2017年 | 141篇 |
2016年 | 205篇 |
2015年 | 78篇 |
2014年 | 56篇 |
2013年 | 63篇 |
2012年 | 469篇 |
2011年 | 261篇 |
2010年 | 65篇 |
2009年 | 65篇 |
2008年 | 97篇 |
2007年 | 101篇 |
2006年 | 87篇 |
2005年 | 419篇 |
2004年 | 545篇 |
2003年 | 419篇 |
2002年 | 63篇 |
2001年 | 52篇 |
2000年 | 26篇 |
1999年 | 48篇 |
1998年 | 23篇 |
1997年 | 39篇 |
1996年 | 12篇 |
1995年 | 15篇 |
1994年 | 13篇 |
1993年 | 13篇 |
1992年 | 9篇 |
1991年 | 12篇 |
1990年 | 4篇 |
1989年 | 5篇 |
1986年 | 2篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1972年 | 2篇 |
1971年 | 1篇 |
1969年 | 1篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1966年 | 2篇 |
1961年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有3681条查询结果,搜索用时 62 毫秒
551.
Māris K?avi?š Agrita Briede Elga Parele Valery Rodinov Inta K?avi?a 《Chemosphere》1998,36(15):3043-3053
The concentrations of cadmium, lead, nickel and copper in waters, sediments (total metal concentrations and their speciation forms) and benthic macroinvertebrates in 11 lakes of Latvia were determined using atomic absorption spectroscopy. Metal concentrations in lake waters, sediments and biota were compared with water chemistry. Compared to total concentrations, metal speciation forms in sediments were better correlated with respective metal concentrations in invertebrates. Therefore, the evaluation of potential metal bioaccumulation should consider metal speciation. The mean concentrations of trace metals in benthic invertebrates in Latvia were much lower than in other countries, which can be explained by comparatively lower anthropogenic loads. However, local areas of anthropogenic impacts were evident. 相似文献
552.
敌百虫萃取分离的研究 总被引:15,自引:2,他引:13
在考察敌百虫亲油性的基础上,本文对敌百虫稀溶液进行了溶剂萃取和络合萃取的研究。结果表于敌百虫的亲油一般,溶剂萃取分配系数较小,加入胺类络合剂提高了溶剂对敌百虫的萃取分配系数。 相似文献
553.
554.
555.
Han Qu Hongting Diao Jiajun Han Bin Wang Gang Yu 《Frontiers of Environmental Science & Engineering》2023,17(1):12
Over the past decades, the plastic production has been dramatically increased. Indeed, a category of small plastic particles mainly with the shapes of fragments, fibers, or spheres, called microplastics (particles smaller than 5 mm) and nanoplastics (particles smaller than 1 μm) have attracted particular attention. Because of its wide distribution in the environment and potential adverse effects to animal and human, microplastic pollution has been reported as a serious environment problem receiving increased attention in recent years. As one of the commonly detected emerging contaminants in the environment, recent evidence indicates that the concentration of microplastics show an increasing trend, for the reason that up to 12.7 million metric tons of plastic litter is released into aquatic environment from land-based sources each year. Furthermore, microplastic exposure levels of model organisms in laboratory studies are usually several orders of magnitude higher than those found in environment, and the microplastics exposure conditions are also different with those observed in the environment. Additionally, the detection of microplastics in feces indicates that they can be excreted out of the bodies of animal and human. Hence, great uncertainties might exist in microplastics exposure and health risk assessment based on current studies, which might be exaggerated. Policies reduce microplastic emission sources and hence minimize their environmental risks are determined. To promote the above policies, we must first overcome the technical obstacles of detecting microplastics in various samples. 相似文献
556.
Effect of nitrogen and phosphorus on the water quality in the Three Gorges Reservoir Area during and after its construction 总被引:6,自引:1,他引:5
A survey concerning the concentration of the nutrients in the Three Gorges Reservoir Area was carried out. This paper presents the parameters(NO3^- -N, NO2^- -N, KjeldahI-N, non-ionic ammonia, P-PO4 and TP)determined at 16 sampling sites from 1997 to 1999. The dominant soluble nitrogen form was NO3^- -N followed by KjeldahI-N, NO2^- -N and non-ionic ammonia. Mean values of NO3^- -N, NO2^- -N, Kjeldahl-N and non-ionic ammonia ranged from 0.50 to 2.37 mg/L, 0.022 to 0.084 mg/L, 0.33 to 0.99 mg/L and 0.007 to 0.092 mg/L respectively.Mean values of P-PO4 at most sampling sites were higher than 0.1 mg/L for subject to eutrophication. The major factors influencing the concentrations of N and P might be agricultural runoff, municipal and industrial effluents. In addition, 6 kinds of soil were sampled at the area where would inundated after the dam completed. Two approaches were adopted to simulate the N and P release from the inundated soils. The results showed that the soils would release nitrogen and phosphorus to the overlying water when the soils were inundated. The characteristics of soil affected the equilibrium concentrations of N and P between the soil and the overlying water. 相似文献
557.
558.
Yang Jie Sun Jinsheng Wang Ren Qu Yuanzhi 《Environmental science and pollution research international》2023,30(8):19662-19682
Environmental Science and Pollution Research - Oil and gas exploration and development provide important energy sources for the world, and drilling fluid is an essential engineering material for... 相似文献
559.
560.
Chunyan Wang Jiangshan Wang Yi Liu Lei Zhang Yong Sun Jiuhui Qu 《Frontiers of Environmental Science & Engineering》2021,15(5):110