全文获取类型
收费全文 | 967篇 |
免费 | 46篇 |
国内免费 | 314篇 |
专业分类
安全科学 | 45篇 |
废物处理 | 61篇 |
环保管理 | 62篇 |
综合类 | 538篇 |
基础理论 | 187篇 |
污染及防治 | 323篇 |
评价与监测 | 48篇 |
社会与环境 | 36篇 |
灾害及防治 | 27篇 |
出版年
2023年 | 10篇 |
2022年 | 54篇 |
2021年 | 31篇 |
2020年 | 22篇 |
2019年 | 21篇 |
2018年 | 27篇 |
2017年 | 52篇 |
2016年 | 43篇 |
2015年 | 39篇 |
2014年 | 74篇 |
2013年 | 100篇 |
2012年 | 91篇 |
2011年 | 73篇 |
2010年 | 52篇 |
2009年 | 66篇 |
2008年 | 87篇 |
2007年 | 58篇 |
2006年 | 70篇 |
2005年 | 27篇 |
2004年 | 23篇 |
2003年 | 28篇 |
2002年 | 28篇 |
2001年 | 23篇 |
2000年 | 25篇 |
1999年 | 33篇 |
1998年 | 26篇 |
1997年 | 23篇 |
1996年 | 18篇 |
1995年 | 25篇 |
1994年 | 11篇 |
1993年 | 16篇 |
1992年 | 18篇 |
1991年 | 10篇 |
1990年 | 6篇 |
1989年 | 3篇 |
1988年 | 5篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有1327条查询结果,搜索用时 62 毫秒
831.
Hezhong Yuan Bingchan Ji Juan Wu Haixiang Wang Jianghua Yu Yiwei Cai Enfeng Liu Qiang Li Qingfei Zeng 《环境科学学报(英文版)》2022,34(8):147-157
Different N and P fractions in microcosm incubation experiment was measured using high-resolution in-situ Peeper and DGT techniques combining with sequential extraction procedure. The results showed the synchronous desorption and release of PO43-, S2- and Fe2+ from the solid soil-originated sediment. This trend indicated that the significant reduction of Fe-P and SO42- occurred in the pore water during the inundation. The concentrations of PO43- in the overlying water and pore water increased to more than 0.1 and 0.2 mg/L at the beginning of the incubation experiment. Decreased NO3-concentrations from more than 1.5 mg/L to less than 0.5 mg/L combining with increasing NH4+ concentrations from less than 1 mg/L to more than 5 mg/L suggested the remarkable NO3- reduction via dissimilatory nitrate reduction to ammonia (DNRA) pathway over time. High NH4+ concentrations in the pore water aggravated the release of Fe2+ through reduction of Fe(III)-P as electric acceptors under anaerobic conditions. This process further stimulated the remarkable releasing of labile PO43- from the solid phase to the solution and potential diffusion into overlying water. Additionally, high S2- concentration at deeper layer indicated the reduction and releasing of S2- from oxidation states, which can stimulated the NO3- reduction and the accumulation of NH4+ in the pore water. This process can also provoke the reduction of Fe-P as electric acceptors following the release of labile PO43- into pore water. Generally, inundation potentially facilitate the desorption of labile P and attention should be paid during the reclaiming lake from polder. 相似文献
832.
Yongguang Yin Zhiyuan Gao Wang Zheng Yanbin Li Yurong Liu Mengjie Wu Shouying Li Ping Li Guangliang Liu Xuewu Fu Shuxiao Wang Feiyue Wang Yong Cai Xinbin Feng Baohua Gu Huan Zhong 《环境科学学报(英文版)》2022,119(9):152-165
The transformation of mercury (Hg) in the environment plays a vital role in the cycling of Hg and its risk to the ecosystem and human health. Of particular importance are Hg oxidation/reduction and methylation/demethylation processes driven or mediated by the dynamics of light, microorganisms, and organic carbon, among others. Advances in understanding those Hg transformation processes determine our capacity of projecting and mitigating Hg risk. Here, we provide a critical analysis of major knowledge gaps in our understanding of Hg transformation in nature, with perspectives on approaches moving forward. Our analysis focuses on Hg transformation processes in the environment, as well as emerging methodology in exploring these processes. Future avenues for improving the understanding of Hg transformation processes to protect ecosystem and human health are also explored. 相似文献
833.
Dingyong Wang Yongguang Yin Siqi Zhang Mingxing Wang Jiang Liu Shanyi Tian Xueling Yang Guangquan Xiao Guomin Xu Tao Jiang Yong Cai Xinbin Feng Shuxiao Wang Huan Zhong Ping Li 《环境科学学报(英文版)》2022,119(9):68-77
Biochar has been used increasingly as a soil additive to control mercury (Hg) pollution in paddy rice fields. As the most active component of soil organic matter, soil dissolved organic matter (DOM) plays a vital role in the environmental fate of contaminants. However, there are very few studies to determine the impact of biochar on the Hg cycle in rice paddies using insights from DOM. This study used original and modified biochar to investigate their effect on DOM dynamics and their potential impact on methylmercury (MeHg) production and bioaccumulation in rice plants. Porewater DOM was collected to analyze the variations in soil-derived DOM in paddy soils. The results showed that the addition of biochar, whether in original or modified form, significantly reduced the bioaccumulation of MeHg in rice plants, especially in hulls and grains (p<0.05). However, MeHg production in soils was only inhibited by the modified biochar. Biochar addition induced a significant increase in DOM's aromaticity and molecular weight (p<0.05), which decreased Hg bioavailability. Furthermore, enhanced microbial activity was also observed in DOM (p<0.05), further increasing MeHg production in the soil. Thus, the effect of biochar on the fate of Hg cycle involves competition between the two different roles of DOM. This study identified a specific mechanism by which biochar affects Hg behavior in rice paddy soil and contributes to understanding the more general influence of biochar in agriculture and contaminant remediation. 相似文献
834.
Huan Zhong Lihai Shang Yongguang Yin Wei Zhang Fen Li Lingjian Gao Guangyi Sun Zikang Cui Fengfeng Chen Ping Li Xinbin Feng Yong Cai Shuxiao Wang 《环境科学学报(英文版)》2022,119(9):59-67
Effective biomarkers are necessary to better understand the human mercury (Hg) exposure levels. However, mismatched biomarker sampling method causes extra uncertainty in assessing the risk of Hg exposure. To compare the differences between hair and fingernail, and further understand the excretion rates of methylmercury (MeHg) and inorganic mercury (IHg) via hair and fingernails, the total mercury (THg), MeHg, and IHg concentrations in paired hair and fingernail samples were investigated through paired samples collected from two typical mining areas, Wanshan mercury mine area (WMMA) and Hezhang zinc smelting area (HZSA). The positive correlation in THg, MeHg, and IHg concentrations (p <0.01) between hair and fingernail samples indicated that those two biomarkers can be corrected in application of assessing human Hg exposure. Compared to fingernails, the hair was suggested to be a more sensitive biomarker as the concentration of THg, MeHg and IHg were 2 ∼ 4 times higher than those in fingernails. Furthermore, the amounts of THg, MeHg, and IHg excreted via hair were 70 ∼ 226 times higher than that excreted via fingernails, and the hair plays a more important role than fingernails in the excretion of Hg from human bodies. Present study therefore provides some new insights to better understand the fate of human assimilated Hg. 相似文献
835.
Ji Yang Yongguang Yin Jiacheng Zhou Hao Zhang Tianying Xie Ye Liu Qicheng Shen Jie Yang Limei Cao Yong Cai Xinbin Feng Shuxiao Wang Huan Zhong Ping Li 《环境科学学报(英文版)》2022,34(9):33-43
The stronger coordination ability of mercury ions with organic ligands than the metal ions in metal organic framework (MOFs) provides an accessible way to separate mercury ions from solution using specific MOFs. In this study, a Co-based MOF (ZIF-67, Co(mIM)2) was synthesized. It did not introduce specific functional groups, such as -SH and -NH2, into its structure through complicated steps. It separate Hg2+ from wastewater with a new strategy, which utilized the stronger coordination ability of Hg2+ with the nitrogen atom on the imidazole ring of the organic ligand than the Co2+ ions. Hg2+ replaced Co2+ nodes from ZIF-67 and formed a more stable precipitate with mIM. The experimental results showed that this new strategy was efficient. ZIF-67 exhibited Hg2+ adsorption capacity of 1740 mg/g, much higher than the known MOFs sorbents. mIMs is the reaction center and ZIF-67 can improve its utilization. The sample color faded from purple to white due to the loss of cobalt ion. It is a great feature of ZIF-67 that allows users to judge whether the sorbent is deactivated intuitively. ZIF-67 can be sustainable recycled by adding organic ligands to the solution after treatment due to its simple synthesis method at room temperature. It's a high-efficient and sustainable sorbent for Hg2+ separation from wastewater. 相似文献
836.
Ying Wang Ailing Zhu Yingying Fang Changjun Fan Yanli Guo Zhiqiang Tan Yongguang Yin Yong Cai Guibin Jiang 《环境科学学报(英文版)》2022,34(5):403-410
A simple and efficient dithizone-functionalized solid-phase extraction (SPE) procedure, online coupled with high-performance liquid chromatography (HPLC)-inductively coupled plasma mass spectrometry, was developed for the first time for enrichment and determination of ultra-trace mercury (Hg) species (inorganic divalent Hg (Hg(II)), methylmercury (CH3Hg(II)) and ethylmercury (C2H5Hg(II)) in cereals and environmental samples. In the proposed method, functionalization of the commercial C18 column with dithizone, enrichment, and elution of the above Hg species can be completed online with the developed SPE device. A simple solution of 2-mercaptoethanol (1% (V/V)) could be used as an eluent for both the SPE and HPLC separation of Hg species, significantly simplifying the method and instrumentation. The online SPE method was optimized by varying dithizone dose, 2-mercaptoethanol concentration, and sample volume. In addition, the effect of pH, coexisting interfering ions, and salt effect on the enrichment was also discussed. Under the optimized conditions, the detection limits of Hg species for 5 mL water sample were 0.15 ng/L for Hg(II), 0.07 ng/L for CH3Hg(II), and 0.04 ng/L for C2H5Hg(II) with recoveries in the range of 85%–100%. The developed dithizone-functionalized C18 SPE column can be reused after a single functionalization, which significantly simplifies the enrichment step. Moreover, the stability of Hg species enriched on the SPE column demonstrated its suitability for field sampling of Hg species for later laboratory analysis. This environment-friendly method offers a robust tool to detect ultra-trace Hg species in cereals and environmental samples. 相似文献
837.
蔡小平 《防灾科技学院学报》2013,15(3):99-105
荒政是明代社会经济发展和稳定的重要保障,也是明王朝的基本国策。明代洪武永乐时期是明朝荒政的初步形成和完善时期,对整个明代都有着重要的影响。从这一时期的荒政措施中归纳出三个重要方面:一、防灾减灾措施;二、救灾赈济政策;三、灾后抚恤安民政策。这些荒政措施的实施,使明王朝从元末明初的经济凋敝、社会混乱的局面中走出来,为"洪武之治"和"永乐盛世"局面的出现奠定了基础。 相似文献
838.
839.
简要分析了渣油加氢脱硫装置火灾爆炸危险性,模拟了VRDS装置氢气泄漏后引发蒸气云爆炸的事故后果。通过分析计算蒸气云爆炸后对人员以及装置设备造成的伤害/破坏范围,指导设计人员以及操作人员制定必要的安全防范措施,将蒸气云爆炸的后果最小化。 相似文献
840.