全文获取类型
收费全文 | 176篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 7篇 |
环保管理 | 12篇 |
综合类 | 9篇 |
基础理论 | 47篇 |
污染及防治 | 69篇 |
评价与监测 | 15篇 |
社会与环境 | 16篇 |
出版年
2023年 | 1篇 |
2022年 | 10篇 |
2021年 | 22篇 |
2020年 | 5篇 |
2019年 | 3篇 |
2018年 | 10篇 |
2017年 | 4篇 |
2016年 | 7篇 |
2015年 | 6篇 |
2014年 | 5篇 |
2013年 | 13篇 |
2012年 | 8篇 |
2011年 | 14篇 |
2010年 | 7篇 |
2009年 | 8篇 |
2008年 | 10篇 |
2007年 | 6篇 |
2006年 | 8篇 |
2005年 | 7篇 |
2004年 | 2篇 |
2003年 | 4篇 |
2002年 | 6篇 |
2001年 | 5篇 |
2000年 | 3篇 |
1998年 | 2篇 |
1978年 | 1篇 |
排序方式: 共有177条查询结果,搜索用时 9 毫秒
81.
Competitive sorption of heavy metal by soils. Isotherms and fractional factorial experiments 总被引:19,自引:0,他引:19
Echeverría JC Morera MT Mazkiarán C Garrido JJ 《Environmental pollution (Barking, Essex : 1987)》1998,101(2):275-284
Competing ions strongly affect heavy metal sorption onto the solid surfaces of soil. This study evaluated competitive sorption of Cd, Cu, Ni, Pb and Zn on three soils: Calcixerollic Xerochrept, Paralithic Xerorthent and Lithic Haplumbrept. Monometal and competitive sorption isotherms were obtained at 25 degrees C. The individual effect of ions on retention of the others was ascertained by a fractional factorial analysis design. Most of the sorption isotherms belonged to type L subtype 2 in the classification of Giles. In competitive sorption the initial linear part was shorter and the knee sharper when compared with monometal sorption isotherms. Parameters related to sorptive capacity, such as Point B, Langmuir monolayer and Freundlich distribution coefficient, were higher in monometal than in competitive sorption, and in basic soils than in acidic soil. Calcium desorbed at different points of the sorption isotherms indicated that cationic exchange with Ca was the main retention mechanism in calcareous soils. For Pb, the ratio Ca desorbed/Pb sorbed was close to one; for Cu, Ni and Zn the ratio ranged from 1.20 to 1.37, probably due to partial dissolution of calcium carbonates by hydrolytic processes during retention. On the other hand, Cd had a ratio around 0.6 reflecting another additional retention mechanism, probably surface complexation. Fractional factorial design confirmed that the presence of the cations investigated reduced the amount of the five metals retained, but the presence of Cu and Pb in the system depressed Ni, Cd and Zn sorption more than the inverse. Cation mobility was enhanced when equilibrium concentration increased and the effect was higher in Ca-saturated soils. 相似文献
82.
Zamulina Inna V. Gorovtsov Andrey V. Minkina Tatiana M. Mandzhieva Saglara S. Burachevskaya Marina V. Bauer Tatiana V. 《Environmental geochemistry and health》2022,44(2):387-398
Environmental Geochemistry and Health - Organic matter (OM) and enzymes activity can act as indicators of the time and level of soil contamination with heavy metal. The goal of this study is... 相似文献
83.
Gavriliev Sakhayaan Petrova Tatiana Miklyaev Petr 《Environmental science and pollution research international》2022,29(59):88606-88617
Environmental Science and Pollution Research - This article delves into the factors that may influence radon flux, such as soil properties and weather conditions, on the example of two experimental... 相似文献
84.
Kolehmainen E Tuppurainen K Lanina SA Sievänen E Laihia K Boyarskiy VP Nikiforov VA Zhesko TE 《Chemosphere》2006,62(3):368-374
Two quantum chemical models have been derived for the prediction of 13C NMR chemical shifts of novel PCB acids obtained from PCBs by catalytic carbonylation. 13C isotropic shielding constants were calculated employing the GIAO (gauge-independent atomic orbital) method with density functional theory (DFT). The best results were obtained by cluster calculations, which took the solvent effects into account properly. In this approach, a solvent molecule (acetone) was attached by a hydrogen bond to every hydrogen atom present in a PCB acid, and the geometry of the molecular cluster was optimized employing the AM1 method. For 158 chemical shifts, the cross-validated standard error was 2.8 ppm and the cross-validated correlation coefficient was 0.94. 相似文献
85.
86.
Konstantinova Elizaveta Minkina Tatiana Konstantinov Alexandr Sushkova Svetlana Antonenko Elena Kurasova Alina Loiko Sergey 《Environmental geochemistry and health》2022,44(2):409-432
Environmental Geochemistry and Health - This study investigated levels and sources of pollution and potential health risks associated with potentially toxic elements (PTEs) and polycyclic aromatic... 相似文献
87.
Rajput Vishnu D. Gorovtsov Andrey V. Fedorenko Grigoriy M. Minkina Tatiana M. Fedorenko Alexey G. Lysenko Vladimir S. Sushkova Svetlana S. Mandzhieva Saglara S. Elinson Maria A. 《Environmental geochemistry and health》2021,43(4):1477-1489
Environmental Geochemistry and Health - The paper presents the results of the model experiment on spring barley (Hordeum vulgare L.) grown in polluted soil. The influence of separate and combined... 相似文献
88.
89.
There is a necessity for improved physical understanding of solute transport processes in heterogeneous soil systems. In situ nondestructive techniques like time domain reflectometry (TDR) and fiber optic miniprobes (FOMPs) permit the collection of unique measurements of solute transport processes in soils for the purposes of model development and validation. This study examined the application of TDR and FOMPs to measure solute transport at various points laterally and at two depths in a heterogeneous clay-loam soil. A miscible displacement experiment was performed at a constant irrigation flux to examine the applicability of these probes to field soils. In their first application to a field soil, the FOMPs were successfully calibrated and performed well in measuring solute breakthrough curves. Two flow regimes were identified in the soil profile, the first where lateral spreading of the solute occurred in the surface horizon, followed by convergence into preferential flow pathways in the second transport zone. The measured transport response was heterogeneous with at least two identifiable vertical flow phases. It was demonstrated using transfer function modeling and data from a corresponding laboratory study that the FOMPs were measuring the slower phase, while the TDR probes captured a composite of the fast and slow phases. The combination of these two techniques may be a means to separate solute transport phases in heterogeneous media and relate laboratory column results to field studies. 相似文献
90.
Measurement of copepod predation on nauplii using qPCR of the cytochrome oxidase I gene 总被引:1,自引:0,他引:1
Edward G. Durbin Maria C. Casas Tatiana A. Rynearson David C. Smith 《Marine Biology》2008,153(4):699-707
A method to directly measure predation rates by older stage copepods upon copepod nauplii using species-specific primers for
the mitochondrial cytochrome oxidase subunit one gene (mtCOI) and real-time quantitative PCR (qPCR) was developed. The general
approach is to determine the mtCOI gene copy number of an individual prey organism and the copy number of the same gene in
the stomachs of predatory copepods collected in the field. From the knowledge of DNA disappearance rates in the stomachs,
ingestion rates can be calculated. In October 2006, laboratory experiments were carried out with Acartia tonsa N1 and N2 as prey and adult female Centropages typicus as predator. The copepods were collected in Narragansett Bay, USA. A. tonsa mtCOI copy numbers copepod−1 were determined for stages N1–C1 and for adults. A. tonsa DNA was detectable in the guts of the predators for as long as 3 h. Exponential rates of decline in prey DNA from the stomachs
of the predators are similar to those measured for gut pigments. Because of the very small amount of DNA in an individual
N1 or N2 nauplius, procedures were developed to maximize the quantitative extraction and recovery of DNA and to increase the
sensitivity of the method. Two quite divergent haplotypes of A. tonsa were found in Narragansett Bay, which required separate qPCR primers; one was present in summer (July) and the other in fall
and winter (October and February). With modification, the methods in this study can likely be applied to a range of predator–prey
systems. 相似文献