全文获取类型
收费全文 | 224篇 |
免费 | 6篇 |
国内免费 | 98篇 |
专业分类
安全科学 | 11篇 |
废物处理 | 21篇 |
环保管理 | 11篇 |
综合类 | 117篇 |
基础理论 | 39篇 |
污染及防治 | 102篇 |
评价与监测 | 4篇 |
社会与环境 | 13篇 |
灾害及防治 | 10篇 |
出版年
2023年 | 10篇 |
2022年 | 5篇 |
2021年 | 6篇 |
2020年 | 10篇 |
2019年 | 7篇 |
2018年 | 11篇 |
2017年 | 15篇 |
2016年 | 19篇 |
2015年 | 8篇 |
2014年 | 31篇 |
2013年 | 21篇 |
2012年 | 25篇 |
2011年 | 22篇 |
2010年 | 13篇 |
2009年 | 10篇 |
2008年 | 17篇 |
2007年 | 20篇 |
2006年 | 12篇 |
2005年 | 10篇 |
2004年 | 7篇 |
2003年 | 4篇 |
2002年 | 7篇 |
2001年 | 7篇 |
2000年 | 3篇 |
1999年 | 7篇 |
1998年 | 5篇 |
1997年 | 1篇 |
1996年 | 4篇 |
1995年 | 6篇 |
1994年 | 5篇 |
排序方式: 共有328条查询结果,搜索用时 343 毫秒
261.
262.
矿化垃圾反应床处理垃圾渗滤液出水中的水溶性有机物 总被引:1,自引:1,他引:1
以矿化垃圾反应床处理垃圾渗滤液出水(以下简称尾水)为研究对象,采用国际上最常用的树脂联用法,对其进行梯度分离表征.研究结果表明,憎水性腐殖质对尾水COD和溶解性有机碳(DOC)的贡献分别为42.55%和45.12%,准亲水性物质对尾水中COD和DOC的贡献分别为34.89%和37.14%,憎水性腐殖质和准亲水性物质是尾水中水溶性有机物(DOM)的重要组成部分.近紫外区域吸光度分析发现,尾水中含有大量带共轭双键或苯环的有机物质,这些物质从尾水中去除后,尾水在近紫外区域的吸光度明显下降.分子量分布显示.尾水中DOM的分子量主要集中在2 000 u以下.元素分析和红外光谱结果显示,胡敏酸(HA)和富里酸(FA)带有苯环结构,存在醇羟基或酚羟基及羧酸官能团;准亲水性物质含有较多的羧酸官能团,另外存在一定置的羟基官能团,同时还可能含有三键和双键的结构. 相似文献
263.
264.
Jian Gao Yuechong Zhang Meng Zhang Jingqiao Zhang Shulan Wang Jun Tao Han Wang Datong Luo Fahe Chai Chun Ren 《环境科学学报(英文版)》2014,26(1):44-53
Beijing sufered from serious air pollution in October, 2011 with the occurrence of three continuous episodes. Here we analyze the pollution status of particulate matter, the relationship between the gaseous pollutants, physical and chemical properties of single particles, and the profile of watersoluble ions in PM2.5during the three episodes. Regional and photochemically aged air masses, which were characterized as having high values of O3and SO2, were hypothesized to have played a dominant role in the first episode. After mixing local air masses with freshly-emitted primary pollutants, the concentration of NOx continued to increase and the size of SO4 2, NO3 and NH4 +in the particle population continued to become smaller. The amount of elemental carbon-rich and organic carbonrich particles in the scaled single particles(0.2–2 μm) and water-soluble K+in PM2.5also increased in the episodes. All the available information suggests that the biomass or fuel burning sources in or around Beijing may have had a huge impact on the last two episodes. 相似文献
265.
北京市典型城区环境空气中苯系物的污染特征、来源分析与健康风险评价 总被引:2,自引:0,他引:2
自2013年6月以来,利用Airmo VOC在线分析仪在北京市典型城区开展了环境空气中挥发性有机物(VOCs)的连续观测,选取2014年4个季节中各1个月的苯系物在线数据,分析了其浓度水平、变化特征、光化学反应活性,利用美国环保署(US EPA)提出的健康风险评价方法开展了有毒有害苯系物物种的健康风险评价,结合来源分析结果,明确北京市应重点控制的苯系物污染来源。研究区观测期间环境空气中16种苯系物的质量浓度为(22.64±16.83)μg·m-3,且具有秋季冬季春季夏季的特点,其中BTEX(苯、甲苯、乙苯和二甲苯)的质量浓度为(19.27±14.46)μg·m-3,占苯系物浓度水平的41.09%~95.16%。研究区观测期间苯系物质量浓度夜间高于日间,日变化呈V字形,在13:00—15:00时质量浓度低。16种苯系物的臭氧生成潜势(OFP)的范围为66.62~170.67μg·m-3,其中间+对二甲苯、甲苯和邻二甲苯的OFP值相对较大;二次有机气溶胶生成潜势(SOAFP)的范围为0.71~1.86μg·m-3,其中甲苯、间+对二甲苯和乙苯的SOAFP值相对较大。研究区观测期间6种苯系物(BTEX和苯乙烯)的危害指数在8.19E-03~5.01E-02之间,在4个季节中对暴露人群尚不存在非致癌性风险;而Ⅰ类致癌物质苯的风险值处于7.13E-08~8.13E-06之间,在夏、秋和冬季对研究区暴露人群的人体健康均存在潜在的致癌性风险。来源分析结果表明,研究区春、秋季苯系物主要来源于机动车尾气的排放,其中春季还受到溶剂等挥发的影响,夏、冬季苯系物则主要来自于燃煤源。 相似文献
266.
Chai Yunxu Xiao Changlai Li Mingqian Wang Xinrui Liang Xiujuan 《Environmental science and pollution research international》2021,28(16):20045-20057
Environmental Science and Pollution Research - Stable isotopes (δDVSMOW and δ18OVSMOW) and hydrochemical characteristics were analyzed to determine the groundwater and surface water... 相似文献
267.
268.
Liyuan Chai Xu Yan Qingzhu Li Bentao Yang Qingwei Wang 《Environmental science and pollution research international》2014,21(21):12436-12444
Abiological granular sludge (ABGS) formation is a potential and facile strategy for improving sludge settling performance during zinc removal from wastewater using chemical precipitation. In this study, the effect of pH, seed dosage, and flocculant dosage on ABGS formation and treated water quality was investigated. Results show that settling velocity of ABGS can reach up to 4.00 cm/s under optimal conditions, e.g., pH of 9.0, zinc oxide (ZnO) seeds dosage of 1.5 g/l, and polyacrylamide (PAM) dosage of 10 mg/l. More importantly, ABGS formation mechanism was investigated in NaOH precipitation process and compared with that in bio-polymer ferric sulfate (BPFS)–NaOH precipitation process regarding their sludge structure and composition. In the NaOH precipitation process, ABGS formation depends on some attractions between particles, such as van der Waals attraction and bridging attraction. However, during the BPFS–NaOH sludge formation process, steric repulsion becomes dominant due to the adsorption of BPFS on ZnO seeds. This repulsion further causes extremely loose structure and poor settling performance of BPFS–NaOH sludge. 相似文献
269.
Honglin Liu Tingting Yao Wanyu Ding Hualin Wang Dongying Ju Weiping Chai 《环境科学学报(英文版)》2013,(S1):S54-S58
N doped TiO2 films were deposited by direct current pulse magnetron sputtering system at room temperature. By using UV-Vis spectrophotometer and atomic force microscope, we studied the influence of N2 flow rate on the optical property and surface morphology of films. The results indicate that the optical property and surface morphology of N doped TiO2 film was dominated by the N2 flow rate. The mean absorbency in visible range of pure TiO2 films is near to 0%, which means that the pure TiO2 could hardly display the photocatalytic property in visible range. When N2 flow rate is 2 sccm, the mean absorbency in visible range of N doped TiO2 film could reach at 24%. In this case, the film could be used as photocatalyst induced by visible light. While with increasing N2 flow rate, the mean absorbency in visible range of N doped TiO2 film decreased abruptly. Especially when N2 flow rate exceeded 8 sccm, the mean absorbency in visible range of N doped TiO2 film decreased to about 0%, which is like pure TiO2 fimls. 相似文献
270.
N doped TiO2 films were deposited by direct current pulse magnetron sputtering system at room temperature. By using UV-Vis spectrophotometer and atomic force microscope, we studied the influence of N2 flow rate on the optical property and surface morphology of films. The results indicate that the optical property and surface morphology of N doped TiO2 film was dominated by the N2 flow rate. The mean absorbency in visible range of pure TiO2 films is near to 0%, which means that the pure TiO2 could hardly display the photocatalytic property in visible range. When N2 flow rate is 2 sccm, the mean absorbency in visible range of N doped TiO2 film could reach at 24%. In this case, the film could be used as photocatalyst induced by visible light. While with increasing N2 flow rate, the mean absorbency in visible range of N doped TiO2 film decreased abruptly. Especially when N2 flow rate exceeded 8 sccm, the mean absorbency in visible range of N doped TiO2 film decreased to about 0%, which is like pure TiO2 fimls. 相似文献