全文获取类型
收费全文 | 8076篇 |
免费 | 91篇 |
国内免费 | 244篇 |
专业分类
安全科学 | 159篇 |
废物处理 | 394篇 |
环保管理 | 920篇 |
综合类 | 1359篇 |
基础理论 | 1976篇 |
污染及防治 | 1998篇 |
评价与监测 | 607篇 |
社会与环境 | 950篇 |
灾害及防治 | 48篇 |
出版年
2023年 | 62篇 |
2022年 | 130篇 |
2021年 | 104篇 |
2020年 | 67篇 |
2019年 | 99篇 |
2018年 | 145篇 |
2017年 | 154篇 |
2016年 | 213篇 |
2015年 | 159篇 |
2014年 | 259篇 |
2013年 | 696篇 |
2012年 | 281篇 |
2011年 | 375篇 |
2010年 | 310篇 |
2009年 | 342篇 |
2008年 | 394篇 |
2007年 | 401篇 |
2006年 | 308篇 |
2005年 | 291篇 |
2004年 | 288篇 |
2003年 | 280篇 |
2002年 | 267篇 |
2001年 | 339篇 |
2000年 | 216篇 |
1999年 | 115篇 |
1998年 | 86篇 |
1997年 | 84篇 |
1996年 | 107篇 |
1995年 | 126篇 |
1994年 | 96篇 |
1993年 | 85篇 |
1992年 | 90篇 |
1991年 | 92篇 |
1990年 | 79篇 |
1989年 | 71篇 |
1988年 | 69篇 |
1987年 | 75篇 |
1986年 | 52篇 |
1985年 | 63篇 |
1984年 | 63篇 |
1983年 | 59篇 |
1982年 | 58篇 |
1981年 | 64篇 |
1980年 | 47篇 |
1979年 | 46篇 |
1977年 | 38篇 |
1976年 | 36篇 |
1974年 | 34篇 |
1973年 | 43篇 |
1972年 | 51篇 |
排序方式: 共有8411条查询结果,搜索用时 15 毫秒
211.
Antimony distribution and environmental mobility at an historic antimony smelter site, New Zealand 总被引:3,自引:0,他引:3
A historic antimony smelter site at Endeavour Inlet, New Zealand has smelter residues with up to 17 wt.% antimony. Residues include coarse tailings (cm scale particles, poorly sorted), sand tailings (well sorted) and smelter slag (blocks up to 30 cm across). All of this material has oxidised to some degree over the ca. 100 years since the site was abandoned. Oxidation has resulted in acidification of the residues down to pH 2-5. Smelter slag contains pyrrhotite (FeS) and metallic antimony, and oxidation is restricted to surfaces only. The coarse tailings are the most oxidised, and few sulfide grains persist. Unoxidised sand tailings contain 10-20 vol.% stibnite (Sb2S3) containing up to 5% As, with subordinate arsenopyrite (FeAsS), and minor pyrite (FeS2). The sand tailings are variably oxidised on a scale of 2-10 cm, but original depositional layering is preserved during oxidation and formation of senarmontite (Sb2O3). Oxidation of sand tailings has resulted in localised mobility of both Sb and As on the cm scale, resulting in redistribution of these metalloids with iron oxyhydroxide around sand grain boundaries. Experiments demonstrate that Sb mobility decreases with time on a scale of days. Attenuation of both As and Sb occurs due to adsorption on to iron oxyhydroxides which are formed during oxidation of the smelter residues. There is no detectable loss of Sb or As from the smelter site into the adjacent river, <50 m away, which has elevated Sb (ca. 20 microg/l) and As (ca. 7 microg/l) from mineralised rocks upstream. Despite the high concentrations of Sb and As in the smelter residues, these metalloids are not being released into the environment. 相似文献
212.
Eshleman KN Wigington PJ Davies TD Tranter M 《Environmental pollution (Barking, Essex : 1987)》1992,77(2-3):287-295
Field studies of chemical changes in surface waters associated with rainfall and snowmelt events have provided evidence of episodic acidification of lakes and streams in Europe and North America. Modelling these chemical changes is particularly challenging because of the variability associated with hydrological transport and chemical transformation processes in catchments. This paper provides a review of mathematical models that have been applied to the problem of episodic acidification. Several empirical approaches, including regression models, mixing models and time series models, support a strong hydrological interpretation of episodic acidification. Regional application of several models has suggested that acidic episodes (in which the acid neutralizing capacity becomes negative) are relatively common in surface waters in several regions of the US that receive acid deposition. Results from physically based models have suggested a lack of understanding of hydrological flowpaths, hydraulic residence times and biogeochemical reactions, particularly those involving aluminum. The ability to better predict episodic chemical responses of surface waters is thus dependent upon elucidation of these and other physical and chemical processes. 相似文献
213.
The global re-cycling of persistent organic pollutants is strongly retarded by soils 总被引:12,自引:0,他引:12
Ockende WA Breivik K Meijer SN Steinnes E Sweetman AJ Jones KC 《Environmental pollution (Barking, Essex : 1987)》2003,121(1):75-80
'Persistent organic pollutants' (POPs) are semi-volatile, mobile in the environment and bioaccumulate. Their toxicity and propensity for long-range atmospheric transport (LRAT) has led to international bans/restrictions on their use/release. LRAT of POPs may occur by a 'single hop' or repeated temperature-driven air-surface exchange. It has been hypothesised that this will result in global fractionation and distillation-with condensation and accumulation in polar regions. Polychlorinated biphenyls (PCBs)--industrial chemicals banned/restricted in the 1970s--provide a classic illustration of POP behaviour. A latitudinally-segmented global PCB inventory has been produced, which shows that approximately 86% of the 1.3 x 10(6) tonnes produced was used in the temperate industrial zone of the northern hemisphere. A global survey of background surface soils gives evidence for 'fractionation' of PCBs. More significantly, however, very little of the total inventory has 'made the journey' via primary emission and/or air-surface exchange and LRAT out of the heavily populated source regions, in the 70 years since PCBs were first produced. Soils generally occlude PCBs, especially soils with dynamic turnover of C/bioturbation/burial mechanisms. This limits the fraction of PCBs available for repeated air-soil exchange. The forested soils of the northern hemisphere, and other C-rich soils, appear to be playing an important role in 'protecting' the Arctic from the advective supply of POPs. Whilst investigations on POPs in remote environments are important, it is imperative that researchers also seek to better understand their release from sources, persistence in source regions, and the significant loss mechanisms/global sinks of these compounds, if they wish to predict future trends. 相似文献
214.
Soumahoro Naminata Sangaré Kouassi N’guessan Louis Berenger Yao Koffi Marcellin Kwa-Koffi Edith Kouassi Kouassi Aka Marcel Trokourey Albert 《Environmental science and pollution research international》2021,28(24):30425-30435
Environmental Science and Pollution Research - The impact of uncontrolled municipal dumping sites on metal contamination in the surrounding waters, sediments, and soils are of great concern in many... 相似文献
215.
216.
Sorption and mobility of metronidazole, olaquindox, oxytetracycline and tylosin in soil 总被引:25,自引:0,他引:25
Laboratory studies were conducted to characterise four different antibiotic compounds with regard to sorption and mobility in various soil types. Distribution coefficients (Kd values) determined by a batch equilibrium method varied between 0.5 and 0.7 for metronidazole, 0.7 and 1.7 for olaquindox and 8 and 128 for tylosin. Tylosin sorption seems to correlate positively with the soil clay content. No other significant interactions between soil characteristics and sorption were observed. Oxytetracycline was particularly strongly sorbed in all soils investigated, with Kd values between 417 in sand soil and 1026 in sandy loam, and no significant desorption was observed. Soil column leaching experiments indicated large differences in the mobility of the four antibiotic substances, corresponding to their respective sorption capabilities. For the weakly adsorbed substances metronidazole and olaquindox the total amounts added were recovered in the leachate of both sandy loam and sand soils. For the strongly adsorbed oxytetracyline and tylosin nothing was detected in the leachate of any of the soil types, indicating a much lower mobility. Results from defractionation and extraction of the columns (30 cm length) showed that 60-80% of the tylosin added had been leached to a depth of 5 cm in the sandy loam soil and 25 cm in the sand soil. 相似文献
217.
218.
Titanium dioxide films were prepared on glass, indium-tin oxide (ITO) glass and p-type monocrystalline silicon and studied for the photocatalytic degradation of rhodamine B in an aqueous medium. Raman, AFM, and XPS spectroscopic investigations of these films indicated that microstructure of titanium oxide films were greatly affected by the substrate materials. Rutile was confirmed to be easily formed on the surface of ITO glass, and TiO2 tended to grow as closely packed particles that were elongated strips with an average size of 20 nm, and had lovely contrast with the perfectly round particles grown on p-type monocrystalline silicon. Charge transfer between the film and silicon substrate was verified by surface photovoltage spectra. This may be the real reason why the films grown on ITO glass and silicon substrates exhibit higher photocatalytic reactivity than the film on glass substrate. Moreover, the different surface properties also seem to be responsible for the different activity. 相似文献
219.
河口湿地是陆海相互作用强烈的重要地球关键带,同时还受到人类活动的强烈影响.黄河三角洲湿地作为年轻的暖温带河口湿地,其微塑料污染状况尚未得到充分研究.因此对黄河三角洲湿地表层沉积物中微塑料的形态、丰度、粒径和成分组成进行了测定,并使用污染负荷指数(PLI)和潜在污染风险指数(PRI)评估了研究区域微塑料污染状况和生态风险.结果表明,黄河三角洲湿地微塑料丰度为20~520 n ·kg-1,中值为150 n ·kg-1.微塑料形貌以纤维和黑色为主,粒径在1 mm以上,成分多为人造丝、聚乙烯、聚酯纤维和聚对苯二甲酸乙二醇酯等.湿地中微塑料的PLI值介于0.04~0.96之间,PRI值介于0.00~171.60之间,表明黄河三角洲湿地微塑料污染处于轻微污染和低生态风险水平. 相似文献
220.