全文获取类型
收费全文 | 675篇 |
免费 | 72篇 |
国内免费 | 392篇 |
专业分类
安全科学 | 15篇 |
废物处理 | 47篇 |
环保管理 | 38篇 |
综合类 | 644篇 |
基础理论 | 180篇 |
污染及防治 | 99篇 |
评价与监测 | 98篇 |
社会与环境 | 17篇 |
灾害及防治 | 1篇 |
出版年
2024年 | 1篇 |
2023年 | 2篇 |
2022年 | 32篇 |
2021年 | 19篇 |
2020年 | 15篇 |
2019年 | 36篇 |
2018年 | 33篇 |
2017年 | 41篇 |
2016年 | 59篇 |
2015年 | 64篇 |
2014年 | 81篇 |
2013年 | 104篇 |
2012年 | 67篇 |
2011年 | 49篇 |
2010年 | 65篇 |
2009年 | 42篇 |
2008年 | 42篇 |
2007年 | 56篇 |
2006年 | 46篇 |
2005年 | 49篇 |
2004年 | 45篇 |
2003年 | 25篇 |
2002年 | 17篇 |
2001年 | 35篇 |
2000年 | 30篇 |
1999年 | 12篇 |
1998年 | 11篇 |
1997年 | 17篇 |
1996年 | 8篇 |
1995年 | 4篇 |
1994年 | 8篇 |
1993年 | 6篇 |
1992年 | 3篇 |
1991年 | 4篇 |
1990年 | 1篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 2篇 |
排序方式: 共有1139条查询结果,搜索用时 109 毫秒
81.
三峡水库汞活化效应对鱼汞含量影响的预测 总被引:6,自引:0,他引:6
报道了三峡库区长江干流江段鱼体汞元素的含量范围为0.04 ̄0.42mg/kg(湿重),高于长江水系鱼体汞含量水平。分析了三峡库区鱼体汞含量高的原因,指出三峡库区毗邻武陵山高汞背景区,主要受汞矿开发、高汞燃煤及城市废弃物排放的影响。利用水库汞活化指数模型,预测三峡水库蓄水后库区干流及40条主要支流水域汞的活化效应将增强0.35 ̄1.5倍,鱼体汞含量将是现在鱼汞含量的1.4 ̄2.5倍;并根据不同鱼种汞 相似文献
82.
Lowest Effect Levels of Lead and Mercury on Decomposition of Mor Layer Samples in a Long-Term Experiment 总被引:2,自引:0,他引:2
Indications of possible negative effects of lead (Pb) and mercury(Hg) on microbial respiration in Southern Swedish forest humus layers led to experiments on dose-response relationships by additions of metal salts in the laboratory. Respiration rates andweight loss due to decomposition of organic material were measured. For relevance to field situations metal doses were low,the time span was long, 550 days including freeze storage, and microbial activity was kept up by plant litter additions. We looked for effects of Pb and Hg at levels moderately elevated above the Southern Swedish reference, as well as combined effectsof Pb + Hg. A reduction in respiration and decomposition of10% was found at about 225–245 g g-1 of total Pb, i.e. ata Pb level elevated 3.5 times. Although small effects of Hg werefound even at the lowest dose level, 10% inhibition of microbialactivity appeared temporarily at about 2–3 g g-1 of total Hg, i. e. at 6–8 times the reference level. There were nolong-term additive effects of Pb and Hg on decomposition. Type of anion had a strong influence on the test, chlorides of Pbbeing more toxic than nitrates. Long-term monitoring and maintenance of microbial activity during the experiment were prerequisites for the occurrence of effects at low metal levels. 相似文献
83.
AFS-830型双道原子荧光光度计同时测定饮用水中砷、汞 总被引:1,自引:0,他引:1
主要探讨应用AFS-830型双道原子荧光光度计,在饮用水监测中同时测定水中砷、汞的方法和技术。此法是在硝酸介质,以硼氢化钠作还原剂,进行原子化,被测元素原子激发出荧光强度值在一定范围内与被测元素的浓度成正比。砷与汞的检出限分别为0.0618和0.0158ug/L。 相似文献
84.
85.
86.
Mercury (Hg) is a hazardous chemical that accumulates in many cells and tissues, thereby producing toxicity. The kidney is a key target organ for Hg accumulation and toxicity. The contributing factors to Hg accumulation in humans include: (1) elemental and inorganic Hg exposure, often occurring by inhalation of Hg vapors; (2) exposure to methyl Hg (meHg), for example, through contaminated seafood; and (3) exposure to ethyl mercury (etHg) via thimerosal-containing vaccines. Systematic investigations on the toxic effects of etHg/thimerosal on the nervous system were carried out, and etHg/thimerosal emerged as a possible risk factor for autism and other neurodevelopmental disorders. There is, however, little known about the mechanisms and molecular interactions underlying toxicity of etHg/thimerosal in the kidney, which is the focus of the current review. Susceptible populations such as infants, pregnant women, and the elderly are exposed to etHg through thimerosal-containing vaccines, and in-depth study of the potential adverse effects on the kidney is needed. In general, toxicity occurring in association with different forms of Hg is related to: intracellular thiol metabolism and oxidative stress reactions; mitochondrial function; intracellular distribution and build-up of calcium; apoptosis; expression of stress proteins; and also interaction with the cytoskeleton. Available evidence for the etHg-induced toxicity in the kidney was examined, and the main mechanisms and molecular interactions of cytotoxicity of etHg/thimerosal exposure in kidney described. Such accumulating knowledge may help to indicate molecular pathways that, if modulated, may better handle Hg-mediated toxicity. 相似文献
87.
复合式吸收器采样还原一体化冷原子吸收法测定大气中的汞 总被引:4,自引:1,他引:3
目的研制一种高效率采集大气中汞的吸收器.方法利用一种集大泡式与玻砂板式吸收器为一体的复合式吸收器采样,并使采样还原一体化冷原子吸收法测定大气中汞.结果平均吸收率为96%,变异系数在4%~12%之间.结论复合式吸收器采样吸收效率高,适合于大气中微量汞的测定. 相似文献
88.
The determination of trace amount nitrobenzene in wastewater on a hanging mercury drop electrode was studied. The determination
conditions of pH, supporting electrolyte, accumulation potential, accumulation time, and voltammetric response were optimized.
The sharp peak of the nitrobenzene was appeared at 0.05 V. The peak electric current was proportional to the concentration
of nitrobenzene in the range of 1.47 × 10−5 ∼ 1.0 × 10−3 mol/l with relative standard deviations of 3.99 ∼ 8.94%. The detection limit of the nitrobenzene in water was 5 × 10−6 mol/l. The proposed method offered low limit of determination, easy operation, the use of simple instrumentation, high sensitivity
and good reproducibility. It was applied to the determination of nitrobenzene in wastewater with an average recovery of 94.0%
∼ 105%. The proposed method provided fast, sensitive and sometimes real time detection of nitrobenzene. 相似文献
89.
Park JS Oh S Shin MY Kim MK Yi SM Zoh KD 《Environmental pollution (Barking, Essex : 1987)》2008,154(1):12-20
Dissolved gaseous mercury (DGM) and total mercury (TM) concentrations were measured in Juam Reservoir, Korea. DGM concentrations were higher in spring (64+/-13pgL(-1)) and summer (109+/-15pgL(-1)), and lower in fall (20+/-2pgL(-1)) and winter (23+/-6pgL(-1)). In contrast, TM concentrations were higher in fall (3.2+/-0.1ngL(-1)) and winter (3.3+/-0.1ngL(-1)) than in spring (2.3+/-0.1ngL(-1)) and summer (2.2+/-0.4ngL(-1)). DGM concentrations were correlated with water temperature (p<0.0001), ORP (p<0.0001), UV intensity (UV-A: p=0.008; UV-B: p=0.003), and DOC concentration (p=0.0107). DGM concentrations varied diurnally with UV intensity. The average summer DGM (109+/-15pgL(-1)) and TM (2.2+/-0.4ngL(-1)) concentrations in Juam Reservoir were higher than the averages for North American lakes (DGM=38+/-16pgL(-1); TM=1.0+/-1.2ngL(-1)), but lower than levels reported for Baihua Reservoir in China. 相似文献
90.
<正>Mercury is a global pollutant due to its widespread use,emission,and long-range transport(Blum,2013;Pacyna et al.,2010).It is considered a priority pollutant due to its neurological toxicity,persistence,and bioaccumulation(Pacyna et al.,2010;Sharma et al.,2015).Mercury pollution can occur when products that contain mercury are improperly disposed of and mercury is released into the air,water,and soil(Zhang and Wong,2007).An estimated 22%of the annual world usage of mercury is in electrical equipment such as batteries,thermometers,and discharge lamps,and electronic devices such as monitors and 相似文献