全文获取类型
收费全文 | 817篇 |
免费 | 30篇 |
国内免费 | 135篇 |
专业分类
安全科学 | 57篇 |
废物处理 | 65篇 |
环保管理 | 172篇 |
综合类 | 372篇 |
基础理论 | 49篇 |
污染及防治 | 127篇 |
评价与监测 | 118篇 |
社会与环境 | 22篇 |
出版年
2024年 | 4篇 |
2023年 | 9篇 |
2022年 | 10篇 |
2021年 | 11篇 |
2020年 | 13篇 |
2019年 | 11篇 |
2018年 | 13篇 |
2017年 | 15篇 |
2016年 | 32篇 |
2015年 | 29篇 |
2014年 | 59篇 |
2013年 | 70篇 |
2012年 | 39篇 |
2011年 | 50篇 |
2010年 | 34篇 |
2009年 | 58篇 |
2008年 | 47篇 |
2007年 | 67篇 |
2006年 | 58篇 |
2005年 | 41篇 |
2004年 | 33篇 |
2003年 | 43篇 |
2002年 | 35篇 |
2001年 | 26篇 |
2000年 | 25篇 |
1999年 | 28篇 |
1998年 | 30篇 |
1997年 | 19篇 |
1996年 | 16篇 |
1995年 | 14篇 |
1994年 | 16篇 |
1993年 | 4篇 |
1992年 | 5篇 |
1991年 | 4篇 |
1989年 | 2篇 |
1987年 | 2篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1976年 | 1篇 |
1973年 | 3篇 |
1972年 | 1篇 |
1970年 | 1篇 |
排序方式: 共有982条查询结果,搜索用时 125 毫秒
41.
42.
采用微波消解法对固体废物浸出液样品进行前处理,采用乙炔-空气火焰原子吸收法测定钡的含量,检出限为2.04mg/L,加标回收率为94.5%,精密度为4.85%-6.81%。 相似文献
43.
The main objective of this paper is to examine pollution threat, especially to the groundwater resources, around Tarapur industrial
area (also called the Tarapur MIDC area) located on the Arabian Sea Coast in Thane District of Maharashtra State, India and
suggest remedial measures that may also be relevant to other industrial areas on the Indian Sea Coast. One hundred and thirty
one samples were collected from various sources, such as dugwells, borewells, dug-cum-borewells, effluent sumps, drainage
channels (effluent channels), creeks and ocean, for chemical analyses. These analyses show that the area in general is characterized
by hard water and high salinity hazard, possibly due to its proximity and hydraulic connection with the sea. Although the
potability of groundwater is questionable in certain pockets, it is good enough for irrigation purposes at present. Low pH
value and high heavy metal contents in the adjoining Muramba creek water is a matter of great concern and may be attributed
to the indiscriminate disposal of industrial effluents to the drainage channels connecting the creek. Muramba Creek is well
connected with the Arabian Sea, and there are evidences of seawater intrusion around this creek. Because of the fact that
Muramba Creek is highly polluted, and is hydraulically connected with the dugwells and borewells surrounding the creek, it
cannot be ruled out that the groundwater around this creek is susceptible to contamination. Unless measures are not taken
immediately to stop the indiscriminate disposal of the solid wastes and liquid effluents in open ground and drainage channels,
and measures are not taken to maintain the appropriate pH values at the effluent treatment facilities before their disposal,
the problem would indeed be formidable one day, and it will be too late then for the authorities to take care of the resulting
maladies. Few suggestions have been given for controlling and managing the industrial pollution around the Tarapur MIDC area.
These suggestions are relevant to other industrial areas situated on the 7,000 km long Indian Sea Coast. 相似文献
44.
Laboratory-scale studies were aimed at elucidating the physico-chemical aspects on the removal process of crystal violet (CV) from waters and solid substrates. The laponite clay (RD) and sand were chosen for the double aim at investigating them as CV adsorbents for water treatment and as substrates which mime the soil components. Sand is very effective in removing CV from waters. The cyclodextrins (CDs) were exploited as solubility-enhancement agents to remove CV from the solid substrates. They are powerful solvent media because they extract the CV from sand forming water-soluble CV/CD inclusion complexes and do not show affinity for sand. Optimum performance was shown by the modified CDs (i.e. hydroxypropyl-β-cyclodextrin and methyl-β-cyclodextrin). A linear correlation between the logarithm of the equilibrium constant for the CV/CD inclusion complexes formation (Kcpx) and the maximum amount of CV extracted from sand in the columns experiments at a flow rate of 1.5 ml min−1 was drawn. This relationship predicts that CDs with Kcpx < 180 M−1 are not suitable for CV removal from sand. CDs failed to displace CV from RD because they generate the formation of RD clusters where CV remains entrapped. 相似文献
45.
Relation of waste generation and composition to socio-economic factors: a case study 总被引:3,自引:0,他引:3
Bandara NJ Hettiaratchi JP Wirasinghe SC Pilapiiya S 《Environmental monitoring and assessment》2007,135(1-3):31-39
To develop an effective waste management strategy for a given region, it is important to know the amount of waste generated
and the composition of the waste stream. Past research has shown that the amount of waste generated is proportional to the
population and the average mean living standards or the average income of the people. In addition, other factors may affect
the amount and composition of waste. These are climate, living habits, level of education, religious and cultural beliefs,
and social and public attitudes. This paper presents the findings of a study carried out in a suburban municipal area in Sri
Lanka to determine the solid waste generation rate and waste composition based on field surveys and to determine the related
socio-economic factors. A database was developed that included information on the quantity and composition of waste generated
in a sample of households in the study area over a time period. The collected data was analysed to relate waste generation
and composition data to various socio-economic factors. Over 400 sample households were selected for the study using a stratified
random sampling methodology based on municipal wards and property values. A technique that considers both the number of households
in a particular income group (property value range) and the standard deviation of property values within a given income group
was used to determine the appropriate sample size for each municipal ward. Through category and regression analyses, the quantities
of waste and waste composition were related to several socio-economic factors. The paper describes the basis for the sample
selection, the methodology adopted for data collection, the socio-economic parameters used for the analysis, and the relationships
developed from the analysis. 相似文献
46.
Ramom R. Nunes Rhaissa M. Bontempi Giovane Mendonça Gustavo Galetti 《Journal of environmental science and health. Part. B》2016,51(5):271-277
The leather industry (tanneries) generates high amounts of toxic wastes, including solid and liquid effluents that are rich in organic matter and mineral content. Vermicomposting was studied as an alternative method of treating the wastes from tanneries. Vermicompost was produced from the following tannery residues: tanned chips of wet-blue leather, sludge from a liquid residue treatment station, and a mixture of both. Five hundred earthworms (Eisenia fetida) were added to each barrel. During the following 135 days the following parameters were evaluated: pH, total organic carbon (TOC), organic matter (OM), cation exchange capacity (CEC), C:N ratio, and chromium content as Cr (III) and Cr (VI). The results for pH, TOC and OM contents showed decreases in their values during the composting process, whereas values for CEC and total nitrogen rose, indicating that the vermicompost reached maturity. For chromium, at 135 days, all values of Cr (VI) were below the detectable level. Therefore, the Cr (VI) content had probably been biologically transformed into Cr (III), confirming the use of this technique as an advanced biological treatment. The study reinforces the idea that vermicomposting could be introduced as an effective technology for the treatment of industrial tannery waste and the production of agricultural inputs. 相似文献
47.
《环境工程学报》2015,9(1)
以砖混建筑垃圾为研究对象,采用人工模拟雨水,通过静态和动态吸附实验研究了不同粒径粒级建筑垃圾对雨水径流中Cu的吸附效果。结果表明,准二级动力学模型比准一级动力学模型能更好地描述建筑垃圾对Cu的吸附过程;Freundlich等温模型能较好地拟合其等温吸附过程;不同粒径粒级建筑垃圾均对雨水径流中的Cu具有较好的净化效果,去除率均超过90%,粒径粒级越小,对Cu的净化效果越好,但其渗透性能越差;建筑垃圾的粒径粒级对Cu的吸附平衡时间、吸附速率和吸附量具有重要影响,粒径粒级2.36~4.75 mm的建筑垃圾对Cu的平衡吸附速率和平衡吸附量最大,分别为4.1μg/min和12.4μg/g。 相似文献
48.
49.
POPs废物处置技术多目标决策筛选研究 总被引:5,自引:4,他引:1
采用层次分析法对国际上较为成熟的9种POPs废物处置技术进行综合评价,筛选出适合我国的POPs废物处置技术. 从经济指标、环境指标和技术指标3个影响因素建立递阶层次结构模型,每个指标又细分为若干个子准则. 根据模型及评价指标体系设计专家咨询表,发放给POPs相关领域的专家打分. 采用matlab对评价结果进行数值分析,得到9种处置技术的总权重,其中分值最高的处置技术有:水泥窑共处置0.174 8,高温焚烧0.172 7;其次是安全填埋0.107 1,热解吸0.107 0,原位玻璃化0.103 0;最后是深井灌注0.086 9,超临界水氧化0.084 1,碱催化脱氯0.082 3,碱金属还原0.082 3.表明高温焚烧和水泥窑共处置是目前我国POPs废物处置技术的较佳之选. 相似文献
50.