全文获取类型
收费全文 | 195篇 |
免费 | 8篇 |
国内免费 | 22篇 |
专业分类
安全科学 | 6篇 |
废物处理 | 1篇 |
环保管理 | 12篇 |
综合类 | 65篇 |
基础理论 | 36篇 |
污染及防治 | 25篇 |
评价与监测 | 67篇 |
社会与环境 | 12篇 |
灾害及防治 | 1篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 6篇 |
2020年 | 4篇 |
2019年 | 4篇 |
2018年 | 5篇 |
2017年 | 3篇 |
2016年 | 2篇 |
2015年 | 7篇 |
2014年 | 11篇 |
2013年 | 31篇 |
2012年 | 6篇 |
2011年 | 10篇 |
2010年 | 8篇 |
2009年 | 12篇 |
2008年 | 8篇 |
2007年 | 12篇 |
2006年 | 10篇 |
2005年 | 10篇 |
2004年 | 4篇 |
2003年 | 7篇 |
2002年 | 8篇 |
2001年 | 10篇 |
2000年 | 6篇 |
1999年 | 10篇 |
1998年 | 9篇 |
1996年 | 8篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 1篇 |
排序方式: 共有225条查询结果,搜索用时 46 毫秒
152.
Faecal contamination is a major causative factor for incidence of water borne infectious diseases. Certain hydrogen sulfide (H2S) producing enteric bacteria such as Salmonella sp. and Citrobacter sp., assosiated with coliforms, have been considered for rapid detection of recent faecal contamination in water. The basic H2S test medium, modified by adding 0.25 gm/L of L-cystine HCl, was examined for its efficiency with 90 water samples collected from 40 pipe supplies, 20 open wells, 15 hand pumps and 15 different surface water bodies (river, streams and ponds). Sterilized modified culture medium in glass vials was inoculated with 100 mL of each sample and incubated at 20, 25, 30, 35 and 44 ∘C for 18, 24, 42, 48, 66 and 72 h. Blackening of content in incubated vials was considered positive. For comparison, most probable number (MPN) of coliform and faecal coliform per 100 mL was also estimated in each sample by multiple tube fermentation (MTF) method. H2S positive result was exhibited by 78% of samples. Coliform (> 10) and faecal coliform/100 mL were also detected in 59% of samples. Maximum H2S positive results (100%) were found with well and surface water samples incubated at 30, 35 and 44 ∘C for 18 h. Coliform (> 10) and faecal coliform/100 mL were also detected in most of these samples. Pipe supplies (60%) and hand pumps (73%) also exhibited considerable H2S production. Coliforms and faecal coliforms were also found in significant number of these samples. Thus, the modified H2S test may prove a useful alternative indicator of faecal contamination for water quality surveillance and screening of large number of water samples in short duration, particularly during any outbreak of water borne disease among rural population. 相似文献
153.
为了满足铀的高通量快速筛查及环境突发事件快速检测的需要,本研究利用脱氧核酶的特异性催化反应,结合本课题组自主研制开发的倏逝波光纤生物传感器,通过设计两步法的反应策略,即"均相反应,固相杂交"的检测方案,建立了光纤倏逝波生物传感检测铀酰离子的新型技术方法.结果发现,该方法对于5~100 nmol·L~(-1)内的铀酰离子具有良好的线性检测区间,检测限低至0.5 nmol·L~(-1),整个检测过程仅需16 min即可完成,铅和汞等10种金属离子对于本检测方法无明显干扰,表现出了对铀酰离子的良好选择性.传感光纤可重复使用100次以上,不会有信号的明显衰减,可有效降低检测成本.对丹江口水库水进行的实际水样加标回收实验结果显示,丹江口水库实际水样的加标回收率为91.6%~94.6%.本研究可为利用生物传感器法检测环境水体中的铀酰离子提供技术支撑. 相似文献
154.
X射线荧光光谱分析法在土壤样品多元素分析中的应用 总被引:3,自引:0,他引:3
用Epsilon5偏振能量色散X射线荧光光谱仪测定土壤样品中27种元素。方法的准确度用GBW07323和GSS-32标准样品验证,结果均在标准值范围内。方法的精密度用GBW07401标准样品检验,除Ni、Mo、Se和Pr四种元素的RSD〉10%外,其余被测元素的RSD均〈6.3%。实验表明用X射线荧光光谱分析法测定土壤样品中多种元素,具有方法简便、灵敏、准确,检出限低等特点。 相似文献
155.
156.
Geographic patterns of non-carpeted floor dust loading in Syracuse, New York (USA) homes 总被引:1,自引:0,他引:1
Johnson DL Hunt A Griffith DA Hager JM Brooks J Stellalevinsohn H Lanciki A Lucci R Prokhorova D Blount SL 《Environmental geochemistry and health》2009,31(3):353-363
Residential floor dust loading was measured on the smooth floor surface of 488 houses in Syracuse, New York, during the summers
of 2003 and 2004. Using U.S. Environmental Protection Agency (EPA) wipe methods, pre-weighed Ghost Wipes, Lead Wipes, or Whatman
Filters were employed to collect duplicate samples from (predominantly) kitchens. The collection efficiency of the various
media was determined from multiple wipe tests and side-by-side comparisons. The results were normalized and aggregated at
the census tract level to determine whether spatial patterns of dust loading could be observed. Loading was found to be log-normally
distributed, with a geometric mean value of 0.311 g m−2 (29 mg of dust per square foot of floor); 95% of the observations fell in the range of 0.042–2.330 g m−2 (4–216 mg foot−2). The sampling for floor dust loading shows some bias for day of the week in which visits to the residential properties were
made. After a first-order correction for this effect, results were aggregated by census tract and mapped in a geographic information
system (GIS); strong spatial patterns can be identified in an inverse distance weighted mapping. The geographic patterns exhibit
a strong correlation with socio-economic/demographic covariates extracted from the 2000 census summaries. Dust mass on the
floors is positively correlated with renter-occupied properties and family size; it is negatively correlated with measures
of household income. 相似文献
157.
Evidence of the radioactive fallout in the center of Asia (Russia) following the Fukushima Nuclear Accident 总被引:4,自引:0,他引:4
It was recently reported that radioactive fallout due to the Fukushima Nuclear Accident was detected in environmental samples collected in the USA and Greece, which are very far away from Japan. In April-May 2011, fallout radionuclides (134Cs, 137Cs, 131I) released in the Fukushima Nuclear Accident were detected in environmental samples at the city of Krasnoyarsk (Russia), situated in the center of Asia. Similar maximum levels of 131I and 137Cs/134Cs and 131I/137Cs ratios in water samples collected in Russia and Greece suggest the high-velocity movement of the radioactive contamination from the Fukushima Nuclear Accident and the global effects of this accident, similar to those caused by the Chernobyl accident. 相似文献
158.
氦气作载气,选用DB—WAX毛细管色谱柱,优化柱温、柱流量、进样口温度和检测器温度等色谱参数,实现7种苯系物的快速分析。实验结果表明,通过优化色谱条件,7种苯系物在5.3m in内得到了良好的分离,标准样品的测定均值最大相对误差-1.0%,最大相对标准偏差2.5%。 相似文献
159.
P. Zoriy P. Ostapczuk H. Dederichs J. Höbig R. Lennartz M. Zoriy 《Journal of environmental radioactivity》2010,101(5):414-210
Two former uranium mines and a uranium reprocessing factory in the city of Aktau, Kazakhstan, may represent a risk of contaminating the surrounding areas by uranium and its daughter elements. One of the possible fingerprinting tools for studying the environmental contamination is using plant samples, collected in the surroundings of this city in 2007 and 2008. The distribution pattern of environmental pollution by uranium and thorium was evaluated by determining the thorium and uranium concentrations in plant samples (Artemisia austriaca) from the city of Aktau and comparing these results with those obtained for the same species of plants from an unpolluted area (town of Kurchatov). The determination of the uranium and thorium concentrations in different parts of A. austriaca plants collected from the analyzed areas demonstrated that the main contamination of the flora in areas surrounding the city of Aktau was due to dust transported by the wind from the uranium mines. The results obtained demonstrate that all the areas surrounding Aktau have a higher pollution level due to thorium and uranium than the control area (Kurchatov). A few “hot points” with high concentrations of uranium and thorium were found near the uranium reprocessing factory and the uranium mines. 相似文献
160.
Licia Guzzella Abdelmalek Dahchour Claudio Baggiani Fiorenzo Pozzoni 《Journal of environmental science and health. Part. B》2013,48(8):702-708
Benomyl is a benzimidazol fungicide used against various crop pathogens. Although banned in many countries, it is still widely used worldwide and is listed in different monitoring programs among the substances to be monitored to assess human exposure to pesticide residues. The assessment of benomyl is mainly based on the analysis of the residues of its most important metabolite, carbendazim. Existing methods often lack of selectivity and display a limited performance because of the presence of co-extracted compounds. Molecularly imprinted polymers (MIPs) offer an alternative methodology, adsorbing preferentially those target molecules for which the polymers are specifically prepared. In this study, we optimized the synthesis of a polymer imprinted with benomyl. Tests of specificity recognition showed a good performance for carbendazim compared with other similar pesticides. The mean recovery of benomyl (measured as carbendazim) from water samples was estimated to be 90% for MIPs while with real soil samples collected in Morocco the recovery efficiency was 62%. Preliminary tests also suggest that this MIP can implement traditional SPE techniques for assessing benomyl residual concentrations in environmental samples. 相似文献