全文获取类型
收费全文 | 252篇 |
免费 | 5篇 |
国内免费 | 53篇 |
专业分类
安全科学 | 11篇 |
环保管理 | 45篇 |
综合类 | 113篇 |
基础理论 | 26篇 |
污染及防治 | 33篇 |
评价与监测 | 73篇 |
社会与环境 | 9篇 |
出版年
2023年 | 5篇 |
2022年 | 9篇 |
2021年 | 11篇 |
2020年 | 12篇 |
2019年 | 5篇 |
2018年 | 8篇 |
2017年 | 14篇 |
2016年 | 10篇 |
2015年 | 17篇 |
2014年 | 18篇 |
2013年 | 19篇 |
2012年 | 12篇 |
2011年 | 26篇 |
2010年 | 13篇 |
2009年 | 30篇 |
2008年 | 11篇 |
2007年 | 13篇 |
2006年 | 11篇 |
2005年 | 6篇 |
2004年 | 9篇 |
2003年 | 8篇 |
2002年 | 8篇 |
2001年 | 4篇 |
2000年 | 8篇 |
1999年 | 5篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1984年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有310条查询结果,搜索用时 78 毫秒
301.
Drinking water treatment residuals(WTRs) have a potential to realize eutrophication control objectives by reducing the internal phosphorus(P) load of lake sediments. Information regarding the ecological risk of dewatered WTR reuse in aquatic environments is generally lacking, however. In this study, we analyzed the eco-toxicity of leachates from sediments with or without dewatered WTRs toward algae Chlorella vulgaris via algal growth inhibition testing with algal cell density, chlorophyll content, malondialdehyde content, antioxidant enzyme superoxide dismutase activity, and subcellular structure indices. The results suggested that leachates from sediments unanimously inhibited algal growth, with or without the addition of different WTR doses(10% or 50% of the sediment in dry weight) at different p H values(8–9), as well as from sediments treated for different durations(10 or 180 days). The inhibition was primarily the result of P deficiency in the leachates owing to WTR P adsorption, however, our results suggest that the dewatered WTRs were considered as a favorable potential material for internal P loading control in lake restoration projects, as it shows acceptably low risk toward aquatic plants. 相似文献
302.
Many problems in drinking water distribution systems (DWDSs) are caused by microbe, such as biofilm formation, biocorrosion and opportunistic pathogens growth. More iron release from corrosion scales may induce red water. Biofilm played great roles on the corrosion. The iron-oxidizing bacteria (IOB) promoted corrosion. However, when iron-reducing bacteria (IRB) and nitrate-reducing bacteria (NRB) became the main bacteria in biofilm, they could induce iron redox cycling in corrosion process. This process enhanced the precipitation of iron oxides and formation of more Fe3O4 in corrosion scales, which inhibited corrosion effectively. Therefore, the IRB and NRB in the biofilm can reduce iron release and red water occurrence. Moreover, there are many opportunistic pathogens in biofilm of DWDSs. The opportunistic pathogens growth in DWDSs related to the bacterial community changes due to the effects of micropollutants. Micropollutants increased the number of bacteria with antibiotic resistance genes (ARGs). Furthermore, extracellular polymeric substances (EPS) production was increased by the antibiotic resistant bacteria, leading to greater bacterial aggregation and adsorption, increasing the chlorine-resistance capability, which was responsible for the enhancement of the particle-associated opportunistic pathogens in DWDSs. Moreover, O3-biological activated carbon filtration-UV-Cl2 treatment could be used to control the iron release, red water occurrence and opportunistic pathogens growth in DWDSs. 相似文献
303.
The long term exposure of arsenic via drinking water has resulted in wide occurrence of arsenisim globally, and the oxidation of the non-ionic arsenite (As(III)) to negatively-charged arsenate (As(V)) is of crucial importance for the promising removal of arsenic. The chemical oxidants of ozone, chlorine, chlorine dioxide, and potassium permanganate may achieve this goal; however, their application in developing countries is sometimes restricted by the complicate operation and high cost. This review paper focuses on the heterogeneous oxidation of As(III) by solid oxidants such as manganese oxide, and the adsorption of As(V) accordingly. Manganese oxide may be prepared by both chemical and biological methods to achieve good oxidation performance towards As(III). Additionally, manganese oxide may be combined with other metal oxides, e.g., iron oxide, to improve the adsorption capability towards As(V). Furthermore, manganese oxide may be coated onto porous materials of metal organic frameworks to develop novel adsorbents for arsenic removal. To achieve the application in engineering works, the adsorbents granulation may be achieved by drying and calcination, agglomeration, and the active components may also be in situ coated onto the porous materials to maintain the oxidation and adsorption activities as much as possible. The novel adsorbents with heterogeneous oxidation and adsorption capability may be carefully designed for the removal of arsenic in household purifiers, community-level decentralized small systems, and the large-scale drinking water treatment plants (DWTPs). This review provides insight into the fundamental studies on novel adsorbents, the development of innovative technologies, and the demonstration engineering works involved in the heterogeneous oxidation and adsorption, and may be practically valuable for the arsenic pollution control globally. 相似文献
304.
A sampling survey investigated the formation of nitrogenous disinfection by-products (N-DBPs) and carbonaceous DBPs (C-DBPs) from pre-chloramination, an increasingly common treatment strategy in China for regulated C-DBP control, followed by subsequent conventional water treatment processes, i.e., coagulation, sedimentation, and filtration. Dihalogenated N-DBPs typically peaked in the summer and early autumn with a relatively higher temperature, with the maximum levels of dichloroacetamide (DCAcAm), dichloroacetonitrile (DCAN), bromochloroacetonitrile, dibromoacetonitrile and dichloroacetone at 1.8, 6.3, 6.0, 2.6 and 1.8 μg L−1 in the finished water, respectively. Also, the levels of all the dichlorinated N-DBPs were correlated with the ratio of dissolved organic nitrogen (DON) to dissolved organic carbon, implying autochthonous DON played an essential role in the formation of these DBPs. In contrast, the yields of trihalogenated DBPs [chloroform (CF), trichloronitromethane (TCNM) and trichloroacetone (TCAce)] appeared not to be significantly affected by seasons. CF and DCAN were the dominant species in trihalomethanes (THMs) and dihaloacetonitriles (DHANs), respectively. Bromine was more readily incorporated into DHANs to form brominated DBPs than THMs during pre-chloramination. Although pre-chloramination can ensure the finished water to meet with the current Chinese THM regulatory limits, the increased levels of TCNM and TCAce may be a new water quality concern. 相似文献
305.
Giti Kashi 《毒物与环境化学》2017,99(5-6):772-782
Discharge of refinery effluents containing phenanthrene (Phe) may exert carcinogenic effects on aquatic organisms. The aim of the current investigation was to investigate electrochemical removal of Phe from urban drinking water using a batch reactor. Phe removal efficiency was examined under different operating conditions including current density (1–8 mA/cm2), electrode composition materials such as aluminum (Al), copper (Cu), iron (Fe), steel (AS), or zinc (Zn), pH (4–10), and duration (20–60 min). Phe concentration was determined utilizing standard techniques. Steel–Steel (AS–AS) as anode–cathode electrodes resulted in the least Phe removal (not detected), while Zn–Cu anode–cathode electrodes produced the highest Phe removal (100%) under similar experimental conditions. The increase in current density from 1 to 8 mA/cm2 at optimum electrode and pH enhanced Phe removal from 56% to 100%. The rise in duration from 20 to 60 min at optimum electrode and pH increased Phe removal from 32% to 100%. These findings indicated that Phe removal efficiency was elevated with increasing current density, electrolysis time, and pH. Batch experiments indicated that the electrochemical reactor might be effective in removing Phe from drinking water. 相似文献
306.
307.
Providing clean water at relevant quality and quantity is a challenge that regulatory authorities have to face in metropolitan
cities that seem to develop at their limits of sustainability. Istanbul strives to face such a challenge for its population
of over 10 million, through six surface water resources. Two approaches of classification for the reservoirs are presented,
one based on current regulations and an alternative based on a more detailed classification. The results have shown that nutrient
control is the primary issue, and one of the reservoirs has already exceeded the limits of being eutrophic, one is at mesotrophic
conditions, and the remaining four are at the limit of being eutrophic, indicating the significance of making the correct
decision and taking pertinent measures for management and control. It has been observed that the only mesotrophic resource,
which also has the best general quality class, has no industry and a very low population density, whereas the one that is
already eutrophic is also the one with the lowest quality class, has the highest population density, and has the greatest
percentage of urban land use within its watershed. 相似文献
308.
饮用水中超痕量镉的蒸气发生:原子荧光光谱法测定 总被引:10,自引:0,他引:10
研究了在特制测Cd固体试剂存在的水溶液中,Cd与KBH4反应生成挥发性物种,以无色散原子荧光光谱法测定饮用水中超痕量Cd的分析方法,CDSR-1能巧妙地调节反应体系的PH值,使其达到最佳测定PH范围,且能提高挥发性物种发生率,方法的灵敏度可提高1-2数量级,方法线性范围为0-5μg/L,最低检出浓度为0.08μg/L;精密度实验的变异系数为1.3%;回收率为93.0%-106.0%。 相似文献
309.
改性沸石用于饮用水除氟的试验研究 总被引:2,自引:1,他引:2
试验针对存在饮用水的氟污染问题,将天然沸石用NaOH和Al2(SO4)3溶液改性制成除氟材料。静态试验研究表明:改性沸石除氟吸附反应快,其最佳pH值范围为5 ̄9,而且对氟离子具有较好的离子选择性能。通过动态试验研究发现降低进水流量和原水浓度可以增大滤层的吸附容量。两种再生方式对比试验表明用Al2(SO4)3溶液再生效果优于用NaOH和Al2(SO4)3溶液联合再生。 相似文献
310.