全文获取类型
收费全文 | 578篇 |
免费 | 56篇 |
国内免费 | 229篇 |
专业分类
安全科学 | 44篇 |
废物处理 | 8篇 |
环保管理 | 41篇 |
综合类 | 408篇 |
基础理论 | 169篇 |
污染及防治 | 80篇 |
评价与监测 | 84篇 |
社会与环境 | 26篇 |
灾害及防治 | 3篇 |
出版年
2024年 | 1篇 |
2023年 | 24篇 |
2022年 | 27篇 |
2021年 | 30篇 |
2020年 | 32篇 |
2019年 | 32篇 |
2018年 | 27篇 |
2017年 | 28篇 |
2016年 | 44篇 |
2015年 | 28篇 |
2014年 | 32篇 |
2013年 | 66篇 |
2012年 | 39篇 |
2011年 | 45篇 |
2010年 | 38篇 |
2009年 | 27篇 |
2008年 | 32篇 |
2007年 | 32篇 |
2006年 | 28篇 |
2005年 | 29篇 |
2004年 | 27篇 |
2003年 | 21篇 |
2002年 | 26篇 |
2001年 | 17篇 |
2000年 | 19篇 |
1999年 | 17篇 |
1998年 | 20篇 |
1997年 | 5篇 |
1996年 | 13篇 |
1995年 | 14篇 |
1994年 | 10篇 |
1993年 | 9篇 |
1992年 | 6篇 |
1991年 | 2篇 |
1990年 | 7篇 |
1989年 | 2篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1976年 | 2篇 |
1972年 | 1篇 |
排序方式: 共有863条查询结果,搜索用时 718 毫秒
141.
采用土壤稀释〖CD*2〗波长色散X射线荧光光谱法(WDXRF)测定污染土壤和沉积物样品中的重金属和As,解决了由于元素含量高超出工作曲线测定范围产生较大误差的问题,确保测定结果的有效性。通过标准物质、实际样品的方法比对评估方法的准确度和精密度,该方法测定标准样品中多个无机元素的分析结果均满足国标准确度要求,与常规ICP OES法测定值一致,相对偏差均<4.5%。 相似文献
142.
Chemical and colloidal analyses of natural seep water collected from the exploratory studies facility inside Yucca Mountain,Nevada, USA 总被引:1,自引:0,他引:1
Cizdziel JV Guo C Steinberg SM Yu Z Johannesson KH 《Environmental geochemistry and health》2008,30(1):31-44
Yucca Mountain is being considered as a geological repository for the USA’s spent nuclear fuel and high-level nuclear waste.
Numerous groundwater seeps appeared during March 2005 within the exploratory studies facility (ESF), a tunnel excavated in
the mountain. Because of the relevance to radionuclide transport and unsaturated zone-modeling studies, we analyzed the seep
samples for major anions and cations, rare earth elements, and colloids. Major ion species and elemental concentrations in
seep samples reflect interaction of the water with the volcanic rock and secondary calcites. Elemental fractograms from flow-injection
field-flow fractionation ICP–MS scans detected Br, Ca, Cl, Cu, Fe, I, Mg, Si, Sr, W, and U at void fractions, suggesting they
may be present in the form of dissolved anions. Colloids approximately 10 nm in hydrodynamic diameter, possibly calcite, were
also present in the seepage samples. Geochemical calculations indicate, however, these may be an artifact (not present in
the groundwater) which arose because of loss of CO2 during sample collection and storage. 相似文献
143.
Rapant S Cvecková V Dietzová Z Khun M Letkovicová M 《Environmental geochemistry and health》2009,31(1):11-25
This study presents an assessment of the potential impact of geological contamination of the environment on the health of
the population in Spišsko-Gemerské rudohorie Mts. (SGR Mts.). The concentration levels of potentially toxic elements (mainly
As, Cd, Cu, Hg, Pb, Sb, and Zn) were determined in soils, groundwater, surface water, and stream sediments as well as in the
food chain (locally grown vegetables). A medical study included some 30 health indicators for all 98 municipalities of the
study area. The As and Sb contents in human fluids and tissues were analyzed in one municipality identified to be at the highest
risk. Based on element content, environmental and health risks were calculated for respective municipalities. Out of 98 municipalities
14 were characterized with extremely high environmental risk and 10 were characterized with very high carcinogenic risk from
arsenic (groundwater). Extensive statistical analysis of geochemical data (element contents in soils, groundwater, surface
water, and stream sediments) and health indicators was performed. Significant correlations between element contents in the
geological environment and health indicators, mainly cancer and cardiovascular diseases, were identified. Biological monitoring
has confirmed the transfer of elements from the geological environment to human fluids and tissues as well as to the local
food chain. 相似文献
144.
Characterization of Santa Catarina (Brazil) coal with respect to human health and environmental concerns 总被引:1,自引:0,他引:1
Silva LF Oliveira ML da Boit KM Finkelman RB 《Environmental geochemistry and health》2009,31(4):475-485
The current paper presents the concentration, distribution, and modes of occurrence of trace elements of 13 coals from south
Brazil. The samples were collected in the state of Santa Catarina. Chemical analyses and the high ash yields indicate that
all studied coals are rich in mineral matter, with SiO2 and Al2O3 dominating as determined by inductively coupled plasma-atomic emission spectrometry (ICP-AES). Quartz is the main mineral
species and is associated with minor levels of feldspars, kaolinite, hematite, and iron-rich carbonates. The contents of trace
elements, including As, Pb, Cd, Ni, Cr, Mn, Be, V, U, Zn, Li, Cu, Tl, and Ni, in coals were determined. A comparison of ranges
and means of elemental concentrations in Santa Catarina, Brazil, and world coals shows that the ranges of most elements in
Santa Catarina coal are very close to the usual worldwide concentration ranges in coal. 相似文献
145.
发展地方环保产业的思考 总被引:1,自引:0,他引:1
本文论述了发展地方环保产业的六大要素:优势、科技、龙头、基地、环境、创新。抓住了这六大要素,地方环保产业就可成为地方经济新的增长点。 相似文献
146.
6+ ), copper (Cu), lead (Pb), mercury (Hg), nickel (Ni), selenium (Se), zinc (Zn), and polychlorinated biphenyls (PCBs). Water-column,
bed-sediment, and fish-tissue (fillets) data collected by five government agencies comprised the ambient data set; effluent
data from five registered facilities comprised the compliance data set. The nonparametric Mann-Kendall trend test indicated
that 33% of temporal trends in all data were statistically significant (P < 0.05). Possible reasons for this were low sample sizes, and a high percentage of samples below the analytical detection
limit. Trends in compliance data were more distinct; most trace elements decreased significantly, probably due to improvements
in wastewater treatment. Seven trace elements (Cr, Cd, Cu, Pb, Hg, Ni, and Zn) had statistically significant decreases in
wastewater and portions of either or both ambient water and bed sediment. No trends were found in fish tissue. Inconsistency
in trends between ambient and compliance data were often found for individual constituents, making overall similarity between
the data sets difficult to determine. Logistical differences in monitoring programs, such as varying field and laboratory
methods among agencies, made it difficult to assess ambient temporal trends. 相似文献
147.
镉和硒染毒对大鼠体内一些营养元素的影响 总被引:1,自引:0,他引:1
为了解染毒元素 Cd 和 Se 在生物体内对一些营养元素的影响,采用体内中子活化分析和原子吸收法分析了大鼠被高含量Cd或Se染毒后,不同组合的动物体内这些元素的平均含量的变化.结果表明,高含量 Cd 使大鼠体内N、Ca 、Zn 、Cu 的含量大幅度的降低,而高含量Se使大鼠体内 N、Ca、Zn 、Cu的含量有一定的降低;当高含量的 Cd和 Se 同时在大鼠体内作用时, Se 和 Cd 对 N、Ca 、Zn 、Cu 元素,的毒性作用有相互缓解作用,而Se 和 Cd 对 P、K、Mg 元素毒性却有相互加重作用. 相似文献
148.
149.
150.
不同汞暴露水平地区鱼组织中汞和硒及其它元素的相关性 总被引:11,自引:3,他引:8
用仪器中子活化分析法测定了贵州汞污染地区和北京地区(对照)鱼肝脏和肌肉组织中硒及其它多种元素的含量,用原子荧光法测定了样品中汞的含量,并对汞和硒及其它元素间的相关性进行了研究.结果发现,贵州和北京鱼样的绝大多数元素在肝脏和肌肉中的含量都存在显著性差异,且大多是肝脏中的含量大于肌肉中的含量.贵州汞污染地区鱼肝中的汞含量要比北京的高25倍,而前者鱼肌肉中的汞含量也要比后者高5倍,但未发现两地鱼样中的硒存在类似的差异.对鱼组织中所测定的其它大部分元素未见两地间存在显著性差异.在汞含量较低的情况下,鱼组织中汞与硒的摩尔比值随汞含量的增加而增加,但当汞含量增大到一定程度,汞与硒的摩尔比值的变化趋势就大大减弱,并趋于某一较高的恒定值(约0.2).研究同一元素在鱼肝和肌肉中的相关性,仅发现溴、铷2个元素在鱼肝和鱼肌肉中有较强的线性正相关.在贵州和北京两地的鱼肝和肌肉组织中,虽然有不少元素间存在一定的相关性,但贵州鱼肌肉的汞与硒之间存在的相关性最强,贵州鱼肝的汞与硒间也存在较强的相关性;而在北京鱼组织中,仅鱼肝的汞与硒之间存在一定的相关性,鱼肌肉的汞与硒之间却未见有相关性存在.这一结果再次证实了汞暴露水平越高,硒对汞毒性的拮抗作用越明显.观察到的鱼组织中钾与钠,铯与铷等元素间显著的相关性可能与它们具有相似的理化性质有关.另外,在贵州和北京的鱼肌肉组织中均观察到铁与锌之间具有很强的线性正相关,这可用这2种元素在动物体中不同的生物学功能及在一定条件下它们间存在的拮抗作用来给予适当的解释. 相似文献