全文获取类型
收费全文 | 1377篇 |
免费 | 174篇 |
国内免费 | 574篇 |
专业分类
安全科学 | 240篇 |
废物处理 | 104篇 |
环保管理 | 133篇 |
综合类 | 1091篇 |
基础理论 | 227篇 |
污染及防治 | 207篇 |
评价与监测 | 92篇 |
社会与环境 | 18篇 |
灾害及防治 | 13篇 |
出版年
2024年 | 66篇 |
2023年 | 24篇 |
2022年 | 114篇 |
2021年 | 30篇 |
2020年 | 34篇 |
2019年 | 48篇 |
2018年 | 40篇 |
2017年 | 59篇 |
2016年 | 43篇 |
2015年 | 45篇 |
2014年 | 103篇 |
2013年 | 131篇 |
2012年 | 120篇 |
2011年 | 106篇 |
2010年 | 184篇 |
2009年 | 128篇 |
2008年 | 111篇 |
2007年 | 65篇 |
2006年 | 65篇 |
2005年 | 83篇 |
2004年 | 68篇 |
2003年 | 62篇 |
2002年 | 42篇 |
2001年 | 40篇 |
2000年 | 13篇 |
1999年 | 44篇 |
1998年 | 47篇 |
1997年 | 42篇 |
1996年 | 42篇 |
1995年 | 39篇 |
1994年 | 30篇 |
1993年 | 11篇 |
1992年 | 17篇 |
1991年 | 9篇 |
1990年 | 11篇 |
1989年 | 7篇 |
1988年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有2125条查询结果,搜索用时 15 毫秒
91.
采用Fenton试剂氧化法处理分散橙、分散紫和分散蓝3种染料结晶废母液。研究了H2O2加入量、n(H2O2)#x02236;n(Fe2+)和废母液pH对COD去除率或TOC去除率的影响。对TOC去除反应分段进行了动力学方程拟合,并探讨了反应机理。实验得到的分散橙、分散紫和分散蓝的废母液处理工艺条件:H2O2加入量分别为264.4,352.9,441.2mmol/L;n(H2O2)#x02236;n(Fe2+)分别为20,10,20;废母液pH=3。3种废母液在0~20min和20~120min两个阶段的反应与二级动力学拟合方程的相关性最好。3种废母液经Fenton试剂氧化处理后,部分有机物降解为小分子有机酸,部分有机物完全矿化。 相似文献
92.
考察了微波-活性炭联合处理技术对模拟染料废水中亚甲基蓝和Cd2+的去除效果。对于100 mL浓度为1 000 mg/L的亚甲基蓝溶液、活性炭用量为10 g时,新活性炭对亚甲基蓝的去除率为99.99%;采用700 W微波对吸附亚甲基蓝的活性炭辐射10 min进行再生并回用,经微波辐射再生10次后活性炭对亚甲基蓝的去除率为99.68%,未经微波作用反复使用10次的活性炭对亚甲基蓝的去除率为85.41%。结果表明:微波处理有效地减缓了活性炭吸附能力的下降速率,实现了活性炭再生和反复使用。在吸附过程中,Cd2+使活性炭对亚甲基蓝的吸附能力略有下降,而共存的亚甲基蓝则促进了活性炭对Cd2+的吸附,对新炭和再生后活性炭物理化学特性的表征证明了活性炭对亚甲基蓝的吸附为物理吸附,对Cd2+的吸附为化学吸附。 相似文献
93.
Bacterial diversity in activated sludge from a consecutively aerated submerged
membrane bioreactor treating domestic wastewater 总被引:1,自引:0,他引:1
DU Cheng WU Zhenbin XIAO Enrong ZHOU Qiaohong CHENG Shuiping LIANG Wei HE Feng 《环境科学学报(英文版)》2008,20(10):1210-1217
The bacterial diversity of activated sludge from submerged membrane bioreactor (SMBR) was investigated. A 16S rDNA clone library was generated, and 150 clones were screened using restriction fragment length polymorphism (RFLP). Of the screened clones, almost full-length 16S rDNA sequences of 64 clones were sequenced. Phylogenetic tree was constructed with a database containing clone sequences from this study and bacterial rDNA sequences from NCBI for identification purposes. The 90.6% of the clones were a?l... 相似文献
94.
Ryan L. Fimmen Tamara D. Trouts Daniel D. Richter Jr. Dharni Vasudevan 《环境科学学报(英文版)》2008,20(10):1273-1280
The objective of this study was to improve primary-amine nitrogen (1°-N) quantification in dissolved organic matter (DOM) originating from natural waters where inorganic forms of N, which may cause analytical interference, are commonly encountered. Efforts were targeted at elucidating organic-N structural criteria influencing the response of organic amines to known colorimetric and fluorescent reagents and exploring the use of divalent metal-assisted amide hydrolysis in combination with fluorescence analyse... 相似文献
95.
Steady-state radiolysis experiments were performed to investigate the γ-irradiation treatment of pentachlorophenol (PCP) in aqueous solution. The e?ect of initial concentration on the PCP degradation was also investigated. The experimental results showed that γirradiation was able to degrade PCP in aqueous solution successfully, and the radiolytical degradation process of PCP could be described by the first-order kinetic model. When the initial concentration of PCP was 25 and 50 mg/L and the radiation dose ... 相似文献
96.
Adsorption of mercury on laterite from Guizhou Province, China 总被引:1,自引:1,他引:0
The adsorption behaviors of Hg(Ⅱ) on laterite from Guizhou Province,China,were studied and the adsorption mechanism was discussed.The results showed that different mineral compositons in the laterite will cause differences in the adsorption capacity of laterite to Hg(Ⅱ).Illite and non-crystalloids are the main contributors to enhancing the adsorption capacity of laterite to Hg(Ⅱ).The pH of the solution is an important factor affecting the adsorption of Hg(Ⅱ) on laterite.The alkalescent environment (pH 7-9) ... 相似文献
97.
Residues of organochlorine pesticides in surface soils from college school yards
in Beijing, China 总被引:1,自引:0,他引:1
Organochlorine pesticides (OCPs) have been a major environmental issue, attracting much scientific concern because of their nature of toxicity, persistence, and endocrine disrupting effects. Soil samples were collected from ten college school yards in Beijing in 2006 and analyzed to determine fifteen OCPs. Dichlorodiphenyltrichloroethanes (DDTs) were found to be the main pollutants, accounting for 93.70% of total OCPs, followed by hexachlorohexanes (HCHs) (2.25%) and hexachlorobenzene (HCB) (1.82%). Content... 相似文献
98.
Dissimilatory Fe(Ⅲ) reduction characteristics of paddy soil extract cultures treated with glucose or fatty acids 总被引:2,自引:0,他引:2
《环境科学学报(英文版)》2008,(9)
Dissimilatory Fe(Ⅲ) reduction is a universal process with irreplaceable biological and environmental importance in anoxic environments. Our knowledge about Fe(Ⅲ) reduction predominantly comes from pure cultures of dissimilatory Fe(Ⅲ) reducing bacteria (DFRB). The objective of this study was to compare the effects of glucose and a selection of short organic acids (citrate, succinate, pyruvate, propionate, acetate, and formate) on Fe(Ⅲ) reduction via the anaerobic culture of three paddy soil solutions with Fe... 相似文献
99.
Acetochlor is an increasingly used herbicide on corn in North China. Currently, the effect of acetochlor on soil ammonia-oxidizing bacteria (AOB) communities is not well documented. Here, we studied the diversity and community composition of AOB in soil amended with three concentrations of acetochlor (50, 150, 250 mg/kg) and the control (0 mg acetochlor/kg soil) in a microcosm experiment by PCR-DGGE (polymerase chain reaction-denaturing gradient gel electrophoresis) and the phylogenetic analysis of excised ... 相似文献
100.
ZHANG Lifei ZHENG Minghui ZHANG Bing LIU Wenbin GAO Lirong BA Te REN Zhiyuan SU Guijin 《环境科学学报(英文版)》2008,20(12):1523-1526
Decomposition of hexachlorobenzene(HCB)was investigated over several metal oxides(i.e.,MgO,CaO,BaO,La2O3,CeO2,MnO2, Fe2O3,and Co3O4)supported on Al2O3,which was achieved in closed system at a temperature of 300°C.Catalysts were prepared by incipient wetness impregnation with different metal oxides loading and impregnating solvents.The decomposition effciency of different catalysts for this reaction depends on the nature of the metal oxide used,and Al2O3 supported La2O3 was found to be the most active one.Pe... 相似文献