全文获取类型
收费全文 | 724篇 |
免费 | 65篇 |
国内免费 | 398篇 |
专业分类
安全科学 | 15篇 |
废物处理 | 49篇 |
环保管理 | 41篇 |
综合类 | 655篇 |
基础理论 | 183篇 |
污染及防治 | 121篇 |
评价与监测 | 105篇 |
社会与环境 | 17篇 |
灾害及防治 | 1篇 |
出版年
2024年 | 1篇 |
2023年 | 4篇 |
2022年 | 32篇 |
2021年 | 19篇 |
2020年 | 16篇 |
2019年 | 36篇 |
2018年 | 37篇 |
2017年 | 44篇 |
2016年 | 61篇 |
2015年 | 65篇 |
2014年 | 84篇 |
2013年 | 113篇 |
2012年 | 70篇 |
2011年 | 49篇 |
2010年 | 67篇 |
2009年 | 46篇 |
2008年 | 44篇 |
2007年 | 59篇 |
2006年 | 49篇 |
2005年 | 52篇 |
2004年 | 47篇 |
2003年 | 25篇 |
2002年 | 18篇 |
2001年 | 35篇 |
2000年 | 30篇 |
1999年 | 12篇 |
1998年 | 11篇 |
1997年 | 17篇 |
1996年 | 8篇 |
1995年 | 4篇 |
1994年 | 8篇 |
1993年 | 6篇 |
1992年 | 3篇 |
1991年 | 4篇 |
1990年 | 1篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 2篇 |
排序方式: 共有1187条查询结果,搜索用时 62 毫秒
251.
地下水中汞的形成及其与人群健康的关系 总被引:1,自引:0,他引:1
地下水中汞元素的形成,主要是含汞矿物岩土溶解作用的结果,但其含量一般很低。汞与人体关系密切,结肠癌、肺癌死亡率与土壤中汞含量呈正相关,胃癌死亡率则与汞元素含量呈负相关。地下水汞元素含量小于1μg/L时,不会对人体健康产生危害。 相似文献
252.
253.
254.
255.
The comparative experimental study of inorganic mercury (HgII), methylmercury (MeHg) and cadmium (Cd) bioaccumulation in the Asiatic clam Corbicula fluminea was based on a 14 days' exposure to the water column or sediment compartments, as initial contamination sources. For each contaminant and exposure source, a five-point concentration range was set up in order to quantify the relationships between the contamination pressure and bioaccumulation capacity, at the whole soft body level and in five organs: gills, mantle, visceral mass, kidney and foot. Hg and Cd bioaccumulation at the whole organism level was proportional to the metal concentrations in the water column or sediment. For similar exposure conditions, the average ratios between the metal concentrations in the bivalves - [MeHg]/[HgII] and [MeHg]/[Cd] - were close to 10 and 5 for the sediment source and 8 and 15 for the water column source. Metal distribution in the five organs revealed strong specificities, according to the different contamination modalities studied: kidney and gills were clearly associated with Cd exposure, mantle and foot with MeHg exposure and the visceral mass with inorganic Hg exposure. 相似文献
256.
Stasinakis AS Thomaidis NS Giannes AS Lekkas TD 《Environmental science and pollution research international》2003,10(3):177-182
The inhibition effect of arsenite, As(III), arsenate, As(V), inorganic mercury, Hg(II) and methylmercury, MeHg, on the respiration rate of activated heterotrophic sludge microorganisms was evaluated. As(III) and MeHg were much more toxic to activated sludge than As(V) and Hg(II) respectively. The effect of various experimental parameters on the toxicity, such as sludge age, concentration of suspended solids and exposure time, was investigated. An increase of sludge age or the concentration of suspended solids reduces the observed inhibition. Longer exposure seems to dramatically increase the inhibition of As(III), MeHg and Hg(II) during the first hours of exposure, while the later inhibition increases at a slower rate. On the contrary, in the presence of As(V), 24 hours after exposure, the respiration rate was similar to that of the control biomass. 相似文献
257.
本文选择了上试-402树脂作为常温高效选择性吸附氯化甲基汞的吸附剂,改进了Cbromosorb W-SE30-HCl吸附剂管的制备方法,并同时组装了一套由微孔纤维滤膜与Chromosorb W-SE30-HCl、402树脂、螺旋银丝、镀金细砂等四种吸附管串联组成的采样系统,由小型采样机抽气采样,于常温下同时依次富集颗粒汞、氯化汞、氯化甲基汞、单质汞及二甲基汞,系统小型轻便,适于野外采样。采样后,四种吸附剂分别采用高低两种温度脱汞。上述五种形态汞均由装有高温石英原子化器的AAs定量测定。 相似文献
258.
本文研究了N_(1923)萃淋树脂对汞(Ⅱ)吸萃的性能、溶液的酸效应、吸附等温线、吸附速率及体系温度等对吸萃分配比的影响.用饱和容量法、等摩尔系列法、斜率法等对吸萃物组成进行了探讨.并用红外光谱法、核磁共振谱法对吸萃机理进行了分析. 相似文献
259.
Influence of industry on the geochemical urban environment of Mieres (Spain) and associated health risk 总被引:4,自引:0,他引:4
Loredo J Ordóñez A Charlesworth S De Miguel E 《Environmental geochemistry and health》2003,25(3):307-323
This study is concerned with the elemental composition of soils and street dust collected in an historical industrial city of approximately 27 000 inhabitants, where old Hg mining and metallurgical activities strongly affected the load of heavy metals in the urban environment. For the purpose of the study, representative samples of soils and street dust were collected at different locations in the whole urban area (3 km2). Elevated mean concentrations of As in soils and street dust (69 and 135 g g–1, respectively), and Hg (3.07 and 4.24 g g–1, respectively), compared to background levels and to those found in other cities, reflect the anomalous geochemical nature of these materials and the strong influence exerted by the old mining sites. 相似文献
260.
腐殖酸对土壤挥发汞植物有效性的影响研究 总被引:4,自引:0,他引:4
土壤挥发汞对植物是非常有效的,并能通过食物链威胁人体健康,因此,本试验设计了“密闭箱的水培试验”定量研究了腐殖酸及其组份对土壤挥发汞生物活性的影响,结果发现:腐殖酸能有效地抑制土壤汞的挥发,降低植株对土壤挥发汞的吸收,其作用机理在于土壤挥发汞的形态转化,通过对转化条件的调节,可以达到控制土壤挥发汞向食物的链转移的目的。 相似文献