全文获取类型
收费全文 | 1594篇 |
免费 | 147篇 |
国内免费 | 427篇 |
专业分类
安全科学 | 161篇 |
废物处理 | 60篇 |
环保管理 | 140篇 |
综合类 | 984篇 |
基础理论 | 246篇 |
污染及防治 | 353篇 |
评价与监测 | 96篇 |
社会与环境 | 70篇 |
灾害及防治 | 58篇 |
出版年
2024年 | 8篇 |
2023年 | 30篇 |
2022年 | 93篇 |
2021年 | 81篇 |
2020年 | 72篇 |
2019年 | 44篇 |
2018年 | 51篇 |
2017年 | 58篇 |
2016年 | 60篇 |
2015年 | 72篇 |
2014年 | 106篇 |
2013年 | 148篇 |
2012年 | 159篇 |
2011年 | 141篇 |
2010年 | 121篇 |
2009年 | 129篇 |
2008年 | 108篇 |
2007年 | 133篇 |
2006年 | 104篇 |
2005年 | 65篇 |
2004年 | 72篇 |
2003年 | 54篇 |
2002年 | 49篇 |
2001年 | 51篇 |
2000年 | 35篇 |
1999年 | 33篇 |
1998年 | 19篇 |
1997年 | 20篇 |
1996年 | 11篇 |
1995年 | 5篇 |
1994年 | 8篇 |
1993年 | 8篇 |
1992年 | 6篇 |
1991年 | 5篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1982年 | 1篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1973年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有2168条查询结果,搜索用时 328 毫秒
911.
Biodegradation of nonylphenol in sewage sludge 总被引:18,自引:0,他引:18
We investigated the effects of various factors on the aerobic degradation of nonylphenol (NP) in sewage sludge. NP (5 mg/kg) degradation rate constants (k1) calculated were 0.148 and 0.224 day−1 for the batch experiment and the bioreactor experiment, respectively, and half-lives (t1/2) were 4.7 and 3.1 days, respectively. The optimal pH value for NP degradation in sludge was 7.0 and the degradation rate was enhanced when the temperature was increased and when yeast extract (5 mg/l) and surfactants such as brij 30 or brij 35 (55 or 91 μM) were added. The addition of aluminum sulfate (200 mg/l) and hydrogen peroxide (1 mg/l) inhibited NP degradation within 28 days of incubation. Of the microorganism strains isolated from the sludge samples, we found that strain CT7 (identified as Bacillus sphaericus) manifested the best degrading ability. 相似文献
912.
Mass-size distributions of particulate sulfate, nitrate, and ammonium in a particulate matter nonattainment region in southern Taiwan 总被引:1,自引:0,他引:1
Tsai JH Chang KL Lin JJ Lin YH Chiang HL 《Journal of the Air & Waste Management Association (1995)》2005,55(4):502-509
Concentrations and distributions of three major water-soluble ion species (sulfate, nitrate, and ammonium) contained in ambient particles were measured at three sampling sites in the Kao-ping ambient air quality basin, Taiwan. Ambient particulate matter (PM) samples were collected in a Micro-orifice Uniform Deposit Impactor from February to July 2003 and were analyzed for water-soluble ion species with an ion chromatograph. The PM1/ PM2.5 and PM1/PM10 concentration ratios at the emission source site were 0.73 and 0.53 and were higher than those (0.68 and 0.48) at the background site because there are more combustion sources (i.e., industrial boilers and traffic) around the emission source site. Mass-size distributions of PM NO3- were found in both the fine and coarse modes. SO4(2-)and NH4+ were found in the fine particle mode (PM2.5), with significant fractions of submicron particles (PM1). The source site had higher PM1/PM10(79, 42, and 90%) and PM1/PM2.5 concentration ratios (90, 58, and 93%) for the three major inorganic secondary aerosol components (SO4(2-), NO3-, and NH4+) than the receptor site (65, 27, and 65% for PM1/PM10, 69, 51, and 70% for PM1/PM2.5. Results obtained in this study indicate that the PM1 (submicron aerosol particles) fraction plays an important role in the ambient atmosphere at both emission source and receptor sites. Further studies regarding the origin and formation of ambient secondary aerosols are planned. 相似文献
913.
Estimation of metal and organochlorine pesticide exposures and potential health threat by consumption of oysters in Taiwan 总被引:1,自引:0,他引:1
Han BC Jeng WL Hung TC Ling YC Shieh MJ Chien LC 《Environmental pollution (Barking, Essex : 1987)》2000,109(1):147-156
Pollutant concentrations detected in oysters from 12 different culture areas of Taiwan (especially for the Hsiangshan area and the Machu Islands) from 1991-98 were evaluated to investigate potential carcinogenic (inorganic As and organochlorine pesticides) and non-carcinogenic (Cu, Zn, Cd and inorganic As) risk to the public from ingestion of the oysters. The highest geometric mean (GM) Cu and Zn concentrations of 1108 (range 113-2806) and 1567 (range 303-3593) microg/g dry weight were obtained in oysters from the Hsiangshan coastal area. The maximum GM Cd and As concentrations of 6.82 and 19.3 microg/g dry weight were found in oysters from the Machu Islands area. The p,p'-DDE values range from not detectable in Penghu Islands' oysters to 164 ng/g dry weight in Machu Islands' oysters. The highest tDDT (sum of p,p'-DDE, p,p'-DDD and p,p'-DDT) concentrations of 337 and 340 ng/g dry weight were found in oysters from Kimmen and Machu Islands, respectively. A calculated target hazard quotient (THQ; daily intake/reference dose) of 11.4 (based on 139 g oysters/day) for Cu caused by consuming oysters from the Hsiangshan area is higher than that from other areas (range 0.124-5.95). The highest average Cu intake from Hsiangshan's oysters for individuals is 11.4 times (i.e. THQ=11.4) more than that of reference dose (40 microg/kg/day). However, the maximum THQ values for Cd and As caused by consuming oysters collected from the Machu Islands were 5.57 and 2.63 for Cd and As, respectively. Generally, the results of THQ showed that if only the maximally exposed individuals were considered, the value of 65.4% for oyster was higher than 1.0 in comparison with reference dose. All cancer risk estimates for inorganic As from consuming oysters were higher than 10(-6) (range from 128x10(-6) to 509x10(-6) for maximally exposed individuals and range from 17.1x10(-6) to 68.0x10(-6) for typically exposed individuals, respectively); that is the risk of the lower end of the range of acceptable risk. The highest risk estimate for inorganic As was 509x10(-6) for consumption of oysters by Machu Islands' residents. The lifetime cancer risks of 19.0x10(-6) for tDDT by consuming oysters from the Machu Islands was higher than those from the Penghu Islands (0.37x10(-6)). Therefore, the sum of lifetime cancer risks for tDDT and inorganic As had the highest risks (total risk=528x10(-6)) of consuming oysters from the Machu Islands. Furthermore, a 10(-6) upper limit on lifetime risk as the health protection standard would require maximum oyster consumption rates of approximately 0.26 g/day. 相似文献
914.
The objectives of this research work was to evaluate the reduction of THM precursors by cationic p-DADMAC and determine the correlations between the chlorine demand and trihalomethane formation in the presence of electrolyte solutions and ambient light. The chlorine demand was found to be significantly reduced provided that the H2SO4 electrolyte was fed to the sample solutions. The amount of CHCl3 formation was also decreased when the Na2SO4 electrolyte was introduced in spite of the levels of light intensity. The p-DADMAC can not only effectively remove the turbidity but also reduce the formation of CHCl3. The optimum dosage of p-DADMAC for reducing the turbidity, TOC and CHCl3 in the humic acid and source water samples was determined and depended upon the nature of organics. 相似文献
915.
排污许可证制度在总量控制中的作用和地位 总被引:2,自引:0,他引:2
为了使污染物总量控制工作逐步走向深入并真正收到实效,对“排污许可证制度”核定单位的污染物排放量、排污行为的有效约束、企业排污权的转移与交易、区域污染物排放状况的调控,以及如何确立该制度在污染物总量控制工作中的地位进行了探讨。 相似文献
916.
917.
918.
919.
浅述复垦土地经济评价 总被引:1,自引:0,他引:1
本文对复垦土地的经济评价的意义、国内外发展现状进行了较为详细的阐述,并进行了复垦土地经济评价研究内容和方法的探讨,目的是为了完善我国的土地复垦工作中的薄弱环节。 相似文献
920.
Study on the response of wheat to lead, cadmium and zinc 总被引:2,自引:0,他引:2
Meng Ling Tan De-yong Wang Huan-xiao Duan Chang-qong Duan Pei-Shang Gao Shang-Yi 《环境科学学报(英文版)》1998,10(2):238-244
Studyontheresponseofwheattolead,cadmiumandzincMengLing,TanDeyong,WangHuanxiao,DuanChangqun,DuanPeishang,GaoShangyiDepar... 相似文献