全文获取类型
收费全文 | 1004篇 |
免费 | 110篇 |
国内免费 | 659篇 |
专业分类
安全科学 | 35篇 |
废物处理 | 63篇 |
环保管理 | 61篇 |
综合类 | 1052篇 |
基础理论 | 258篇 |
污染及防治 | 152篇 |
评价与监测 | 124篇 |
社会与环境 | 25篇 |
灾害及防治 | 3篇 |
出版年
2024年 | 4篇 |
2023年 | 10篇 |
2022年 | 52篇 |
2021年 | 48篇 |
2020年 | 35篇 |
2019年 | 65篇 |
2018年 | 71篇 |
2017年 | 69篇 |
2016年 | 88篇 |
2015年 | 105篇 |
2014年 | 118篇 |
2013年 | 136篇 |
2012年 | 110篇 |
2011年 | 78篇 |
2010年 | 90篇 |
2009年 | 69篇 |
2008年 | 60篇 |
2007年 | 96篇 |
2006年 | 65篇 |
2005年 | 66篇 |
2004年 | 61篇 |
2003年 | 37篇 |
2002年 | 28篇 |
2001年 | 47篇 |
2000年 | 40篇 |
1999年 | 17篇 |
1998年 | 20篇 |
1997年 | 24篇 |
1996年 | 10篇 |
1995年 | 7篇 |
1994年 | 13篇 |
1993年 | 7篇 |
1992年 | 7篇 |
1991年 | 5篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1984年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有1773条查询结果,搜索用时 31 毫秒
81.
The Hg0 vapor adsorption experimental results on a novel sorbent obtained by impregnating a commercially available activated
carbon (Darco G60 from BDH) with silver nitrate were reported. The study was performed by using a fundamental approach, in an
apparatus at laboratory scale in which a synthetic flue gas, formed by Hg0 vapors in a nitrogen gas stream, at a given temperature
and mercury concentration, was flowed through a fixed bed of adsorbent material. Breakthrough curves and adsorption isotherms were
obtained for bed temperatures of 90, 120 and 150°C and for Hg0 concentrations in the gas varying in the range of 0.8–5.0 mg/m3. The
experimental gas-solid equilibrium data were used to evaluate the Langmuir parameters and the heat of adsorption. The experimental
results showed that silver impregnated carbon was very effective to capture elemental mercury and the amount of mercury adsorbed by
the carbon decreased as the bed temperature increased. In addition, to evaluate the possibility of adsorbent recovery, desorption was
also studied. Desorption runs showed that both the adsorbing material and the mercury could be easily recovered, since at the end of
desorption the residue on solid was almost negligible. The material balance on mercury and the constitutive equations of the adsorption
phenomenon were integrated, leading to the evaluation of only one kinetic parameter which fits well both the experimentally determined
breakthrough and desorption curves. 相似文献
82.
83.
84.
Ionic composition of submicron particles (PM1.0) during the long-lasting haze period in January 2013 in Wuhan, central China 总被引:1,自引:0,他引:1
Hairong Cheng Wei Gong Zuwu Wang Fan Zhang Xinming Wang Xiaopu Lv Jia Liu Xiaoxin Fu Gan Zhang 《环境科学学报(英文版)》2014,26(4):810-817
In January 2013, a long-lasting severe haze episode occurred in Northern and Central China; at its maximum, it covered a land area of approximately 1.4 million km2. In Wuhan, the largest city in Central China, this event was the most severe haze episode in the 21st century. Aerosol samples of submicron particles (PM1.0) were collected during the long-lasting haze episode at an urban site and a suburban site in Wuhan to investigate the ion characteristics of PM1.0 in this area. The mass concentrations of PM1.0 and its water-soluble inorganic ions (WSIIs) were almost at the same levels at two sites, which indicates that PM1.0 pollution occurs on a regional scale in Wuhan. WSIIs (Na+, NH4+, K+, Mg2+, Ca2+, Cl-, NO3- and SO42-) were the dominant chemical species and constituted up to 48.4% and 47.4% of PM1.0 at WD and TH, respectively. The concentrations of PM1.0 and WSIIs on haze days were approximately two times higher than on normal days. The ion balance calculations indicate that the particles were more acidic on haze days than on normal days. The results of the back trajectory analysis imply that the high concentrations of PM1.0 and its water-soluble inorganic ions may be caused by stagnant weather conditions in Wuhan. 相似文献
85.
Evi Kurniati Novi Arfarit Tsuyoshi Imai Takaya Higuchi Ariyo Kanno Koichi Yamamoto Masahiko Sekine 《环境科学学报(英文版)》2014,26(6):1223-1231
The use of filamentous fungi in bioremediation of heavy metal contamination has been developed recently. This research aims to observe the capability of filamentous fungi isolated from forest soil for bioremediation of mercury contamination in a substrate. Six fungal strains were selected based on their capability to grow in 25 mg/L Hg2+-contaminated potato dextrose agar plates. Fungal strain KRP1 showed the highest ratio of growth diameter, 0.831, thus was chosen for further observation.Identification based on colony and cell morphology carried out by 18S rRNA analysis gave a 98%match to Aspergillus flavus strain KRP1. The fungal characteristics in mercury(Ⅱ) contamination such as range of optimum pH, optimum temperature and tolerance level were 5.5–7 and 25–35℃ and 100 mg/L respectively. The concentration of mercury in the media affected fungal growth during lag phases. The capability of the fungal strain to remove the mercury(Ⅱ) contaminant was evaluated in 100 mL sterile 10 mg/L Hg2+-contaminated potato dextrose broth media in 250 mL Erlenmeyer flasks inoculated with 108spore/mL fungal spore suspension and incubation at 30℃ for 7 days. The mercury(Ⅱ) utilization was observed for flasks shaken in a 130 r/min orbital shaker(shaken) and nonshaken flasks(static) treatments. Flasks containing contaminated media with no fungal spores were also provided as control. All treatments were done in triplicate. The strain was able to remove 97.50%and 98.73% mercury from shaken and static systems respectively. A. flavus strain KRP1 seems to have potential use in bioremediation of aqueous substrates containing mercury(Ⅱ) through a biosorption mechanism. 相似文献
86.
87.
重金属抗性解磷细菌的磷溶解特性研究 总被引:2,自引:1,他引:1
从湖南省湘西州花垣县的铅锌矿表层土壤中,筛选出两株具有重金属抗性和解磷特性的细菌T PSB1和T PSB2.通过16S rRNA基因序列比对,分别鉴定为嗜麦芽寡养单胞菌(Stenotrophomonas maltophilia)和唐菖蒲伯克霍尔德菌(Burkholderia gladioli).T PSB1和T PSB2在含有难溶性无机磷液体培养基中,其上清液的可溶性磷含量最高分别达到了402.9 mg·L-1和589.9 mg·L-1;在难溶性有机磷固体和液体培养基中,固体平板上均出现解磷圈,而液体培养基上清液中,可溶性磷含量也分别达到了2.97 mg·L-1和4.69 mg·L-1.另外,两株细菌对重金属Zn2+的抗性最高,在其浓度为2000 mg·L-1固体和液体培养基条件下均可以生长,磷溶解浓度分别为114.8 mg·L-1和125.1 mg·L-1.而在含铬和铅的浓度为1 000 mg·L-1的液体培养基中,两株细菌同样表现出重金属抗性.在Pb2+浓度为1000 mg·L-1的液体培养基中,磷溶解浓度分别达到了57.9 mg·L-1和71.7 mg·L-1;而在Cr2+浓度为1000 mg·L-1的培养基中磷溶解浓度分别为60.1 mg·L-1和98.4 mg·L-1. 相似文献
88.
巢湖水体组分垂向分布特征及其对水下光场的影响 总被引:5,自引:1,他引:4
富营养化湖泊不同组分垂向分布及其对水下光场的影响是湖泊水环境遥感领域亟待开展的内容.利用巢湖野外实测数据,分析水体不同组分垂向分布特征,结合Hydrolight辐射传输模型模拟研究水体不同组分垂向分布对漫衰减系数Kd的影响.结果表明,巢湖水体悬浮物以及有色可溶性有机物CDOM垂向分布较为均一,水面未发生藻华现象时叶绿素a垂向分布符合高斯正态分布,漫衰减系数Kd受叶绿素a以及无机悬浮物的显著影响,其垂向变化复杂多样,以往以水体光学性质均一为前提计算得到的Kd仅仅表示其衰减的平均情况,不能精确反映水下光场的垂向变化,因此研究水体组分垂向分布特征及其对漫衰减系数Kd的影响是开展藻类垂向分布异质性对水下光场影响机制研究的前提和基础. 相似文献
89.
中亚热带针阔混交林土壤-大气界面释汞通量研究 总被引:4,自引:2,他引:2
为了揭示不同气候条件下森林与大气间汞交换的规律,应用动力学通量箱与Lumex RA 915+测汞仪联用技术,选择重庆缙云山国家级自然保护区为研究地点,于2011年4月~2012年3月对针阔混交林土/气界面释汞通量进行了为期1 a的连续监测,并考察了各环境因子对土壤释汞通量的影响.结果表明,缙云山针阔混交林林地土壤年平均释汞通量值为(16.82±6.70)ng·(m2·h)-1,明显高于欧美国家自然背景区;受光照、温度、相对湿度等气象因素以及亚热带地区森林植被生长变化规律影响,缙云山地区林地土壤释汞通量存在显著的季节性差异,暖季林地土壤释汞通量[(22.23±13.19)ng·(m2·h)-1]明显高于冷季[(6.01±4.05)ng·(m2·h)-1];通径分析结果表明林地土壤释汞通量的日变化特征和1 d中光照强度变化有密切关系,土温、气温和相对湿度与土壤释汞通量之间的显著相关关系可能是光照强度与土壤释汞通量相关关系的表象. 相似文献
90.
三峡库区消落带土壤汞形态分布与风险评价 总被引:18,自引:13,他引:5
为了解三峡库区消落带土壤中汞污染现状和环境风险,选择重庆14个区县的消落带,采集了192个土壤样品,分析其土壤总汞和汞形态分布,探讨其生物可利用性,对比研究和评估土壤总汞与汞赋存形态的污染水平和生态风险.结果表明,三峡库区消落带土壤中汞含量差异较大,土壤汞含量为22.4~393.5μg·kg-1,平均值为(84.2±54.3)μg·kg-1,76.6%的采样点土壤汞含量超过了三峡库区土壤汞背景值.土壤中的汞以残留态为主,不同汞形态所占比例为:水溶态汞4.1%、酸溶态15.5%、碱溶态汞18.3%、过氧化氢溶态汞10.9%、残留态汞51.3%.各区县土壤中生物可利用性汞(水溶态汞、酸溶态汞与碱溶态汞之和)平均含量为19.7~36.6μg·kg-1,生物可利用态汞占总汞的比例达到22.1%~51.6%.地累积指数和潜在生态危害指数评价结果均表明,三峡库区消落带土壤中汞赋存形态的污染水平和生态风险都较低,由生物可利用态汞带来的生态风险也很小;而对土壤总汞含量评价的结果明显偏大.因此,采用汞赋存形态进行污染现状和生态危害评价更能反映消落带土壤汞的环境风险. 相似文献