全文获取类型
收费全文 | 597篇 |
免费 | 38篇 |
国内免费 | 237篇 |
专业分类
安全科学 | 48篇 |
废物处理 | 41篇 |
环保管理 | 59篇 |
综合类 | 317篇 |
基础理论 | 100篇 |
污染及防治 | 228篇 |
评价与监测 | 28篇 |
社会与环境 | 17篇 |
灾害及防治 | 34篇 |
出版年
2023年 | 7篇 |
2022年 | 25篇 |
2021年 | 26篇 |
2020年 | 21篇 |
2019年 | 23篇 |
2018年 | 19篇 |
2017年 | 23篇 |
2016年 | 27篇 |
2015年 | 30篇 |
2014年 | 50篇 |
2013年 | 69篇 |
2012年 | 54篇 |
2011年 | 51篇 |
2010年 | 44篇 |
2009年 | 52篇 |
2008年 | 35篇 |
2007年 | 41篇 |
2006年 | 38篇 |
2005年 | 31篇 |
2004年 | 15篇 |
2003年 | 19篇 |
2002年 | 19篇 |
2001年 | 25篇 |
2000年 | 16篇 |
1999年 | 19篇 |
1998年 | 10篇 |
1997年 | 16篇 |
1996年 | 18篇 |
1995年 | 10篇 |
1994年 | 8篇 |
1993年 | 9篇 |
1992年 | 4篇 |
1991年 | 3篇 |
1990年 | 11篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 1篇 |
排序方式: 共有872条查询结果,搜索用时 786 毫秒
811.
812.
Relationships between distributions of longevous population and trace elements in the agricultural ecosystem of Rugao County,Jiangsu, China 总被引:1,自引:0,他引:1
Huang B Zhao Y Sun W Yang R Gong Z Zou Z Ding F Su J 《Environmental geochemistry and health》2009,31(3):379-390
Soil, plant, and water, as well as trace elements they contain, can influence human health through the food chain. A survey
was conducted on distributions of trace elements in soils, plants, and drinking water in Rugao County, Jiangsu Province, China,
an agricultural area with a high level of centenarians and nonagenarians. The ratio of people over 90 years old per 100,000
inhabitants (90-rate) based on village (about 4,000 residents in 4 km2) was correlated with trace elements in soil, drinking water, and rice by means of correlation analysis and/or principal component
analysis. Although the average 90-rate in the whole area was as high as 277, the rates were not uniform across the entire
region. The 90-rate in the area of loamy and strongly-developed Anthrosols and Cambosols was about 330, significantly higher
than the 255 in the areas of sandy and strongly-developed Cambosols and of clayey and weakly-developed Cambosols. The concentrations
of available Se, B, Ni, and Mo in soils of the area with the high 90-rate were markedly greater than those in the area with
the low 90-rate. This was demonstrated by highly positive correlations between the 90-rate and available Se (r = 0.33), B (r = 0.21), Ni (r = 0.17) and Mo (r = 0.17) at the p < 0.01 level and high loadings of available Se (0.851), B (0.535), Ni (0.594) and Mo (0.394) in the longevous factor. Similar
relationships between the available elements in soils and elements in water and rice were found. These results suggest that:
(1) the available forms of elements in soil were more crucial to elemental bio-availability in the ecosystem and human health
than total elements in soil; and (2) the element association above might have affected the 90-rate positively and could be
an important environmental geochemical factor influencing the longevity of humans. 相似文献
813.
A study was carried out on the residue level of major concern pollutants (PAHs, PCBs and HMs) and the assessment of their genotoxicity in soils obtained from Shenyang, northeast of China which had been subjected to wastewater irrigation for more than 40 years. Topsoils (0-20cm) in paddy fields were sampled along the upper, middle and lower reaches of the wastewater disposal channel. Sixteen USEPA PAHs were determined by High Performance Liquid Chromatography (HPLC) with fluorescence detector, eight PCBs were detected by Gas Chromatography (GC) with electron capture detector, and six heavy metals (Cd, Cu, Pb, Zn, Ni, and Cr) were measured by Atomic Absorption Spectrophotometer (AAS). The genotoxicity effect of soils was examined by Vicia faba micronucleus (MN) test. Archived soils that had undergone a similar history of wastewater irrigation provided by Technical University of Berlin, Germany were subjected to analysis of the above pollutants and Vicia faba/MN test for comparison. Results indicated elevated residues of the studied pollutants (PAHs, especially benzo (a) pyrene, the eight PCB congeners and heavy metals) in both tested and archived soils. The MN frequencies were 2.2-48.4 times higher compared with the control. However, there was no correlation between the MN frequencies and the concentration of pollutants detected. This investigation suggested a potential ecological risk even with a lower level of residual pollutants in soil matrix after long-term wastewater irrigation. 相似文献
814.
巩亚明 《安全.健康和环境》2006,6(1):43-44
生产安全管理可以归纳为生产过程中对人、设备、环境风险因素的评估、控制和消除的综合管理.生产企业在开展安全性评价工作的基础上,通过应用风险控制的基本方法,可以对企业的安全管理起到积极的主导作用,促进安全生产良性循环. 相似文献
815.
Adsorption of microcystins by carbon nanotubes 总被引:4,自引:0,他引:4
The production of cyanobacterial toxins microcystins (MCs) by cyanobacterial bloom which may promote the growth of tumor in human liver is a growing environmental problem worldwide. In this paper, the adsorption of MC-RR and LR, which were extracted from cyanobacterial cells in Dianchi Lake in China, by carbon nanotubes (CNTs), wood-based activated carbon (ACs) and clays were investigated. Compared with ACs and clay materials of sepiolite, kaolinite and talc tested, CNTs were found to have a strong ability in the adsorption of MCs. At the concentrations of 21.5 mg l(-1) MC-RR and 9.6 mg l(-1) MC-LR in 50 mmol phosphate buffer solution (pH 7.0), the adsorption amounts of MCs by CNTs with the range of outside diameter from 2 to 10nm were 14.8 and 5.9 mg g(-1), which were about four times higher than those by other adsorbents tested. It was shown that with the decrease of CNTs outside diameters from 60 to 2 nm, the adsorption amount of MCs was apparently increased, however the size of CNTs particles formed in solution declined. This result implies that the size of CNTs tube pore that is fit for the molecular dimension of MCs plays a dominant role. Furthermore the specific surface area of CNTs was also found to be a factor in the adsorption of MCs. The results suggested that the selection of suitable size of CNTs as a kind of adsorbent is very important in the efficient eliminating MCs from drinking water in future. 相似文献
816.
本文主要探讨了化学防护服(CPC)的功能性测试过程,包括耐化学性能测试、整体性能测试、物理性能测试、人体工程学性能测试。评价CPC是否合格的前题是应该将它暴露在最糟糕的环境下,看它是否能够长时间的起到保护作用。化学防护中与暴露物体直接接触的特征决定了这一类服饰必须经过非常严格的测试才能被选择使用。由此可见性能测试的实用性,对于服装性能测试原理和过程的深刻理解有助于我们了解服装整体的防护性能,更好地做出选择。 相似文献
817.
印染污泥特性及其掺煤焚烧处置的环境影响研究 总被引:1,自引:0,他引:1
对佛山6家印染厂污泥的基本性质和重金属污染进行了分析研究。结果表明:印染污泥有机质含量较高;对照农用污泥污染物限值和城镇污水处理污泥处置混合填埋用泥质标准,Cr、Ni、Cu、Zn不同程度超标,说明印染污泥既不能农用,也不能混合填埋。污泥浸出液中重金属浓度远低于危险废物浸出毒性限值和城镇污水处理厂污泥单独焚烧用泥质的污染物限值。污泥与煤掺混焚烧烟道气中二恶英浓度在0.0125~0.022 ngTEQ/Nm3,远低于GB 18485—2001《生活垃圾焚烧污染控制标准》限值和GB/T 24602—2009《城镇污水处理厂污泥处置单独焚烧用泥质》限值。 相似文献
818.
High cadmium pollution risk on vegetable amaranth and a selection for pollution-safe cultivars to lower the risk 总被引:3,自引:0,他引:3
Yihui ZHOU Meng XUE Zhongyi YANG Yulian GONG Jiangang YUAN Chunyan ZHOU Baifei HUANG 《Frontiers of Environmental Science & Engineering》2013,7(2):219-230
A pot experiment was carried out by growing 29 different genotypes (Amaranthus spp.) of vegetable amaranth under low- (0.12 mg·kg-1) and middle- (0.40 mg·kg-1) cadmium (Cd) exposure. The result showed that amaranth was vulnerable to cadmium (Cd) contamination in soil. Variations of Cd concentrations in both roots and edible parts among genotypes were significant (P <0.001) in both treatments. Cd concentrations in edible parts of the tested genotypes grown under low- and middle-Cd levels were significantly correlated (p <0.01), implying that Cd-accumulating property of amaranth is genotype-dependent. Differences in Cd chemical forms between cv. Nanxingdayemashixian (cv. Nan), a selected typical pollution-safe cultivar (Cd-PSC), and cv. Pennongjianyexian (cv. Pen), a selected typical non-Cd-PSC, under different Cd exposure conditions were compared. It was found that the alternation of Cd in FNaCl (Cd form extracted by 1 mol·L-1 NaCl) may be a key factor in regulating Cd accumulation of different amaranth genotypes and that the protein-binding Cd is considered to be associated with Cd translocation. The results indicated that amaranth is capable of enduring high level of Cd pollution when grown as vegetable crop, and accordingly, consuming vegetable amaranth would bring high health risk. Therefore, adopting Cd-PSC strategy would help reducing the risk of Cd pollution in amaranth. In this study, cv. Nan was identified as a Cd-PSC and recommended to be applied production practice. 相似文献
819.
820.