全文获取类型
收费全文 | 77篇 |
免费 | 9篇 |
国内免费 | 29篇 |
专业分类
安全科学 | 16篇 |
废物处理 | 6篇 |
环保管理 | 3篇 |
综合类 | 31篇 |
基础理论 | 18篇 |
污染及防治 | 30篇 |
评价与监测 | 4篇 |
社会与环境 | 3篇 |
灾害及防治 | 4篇 |
出版年
2023年 | 5篇 |
2022年 | 9篇 |
2021年 | 13篇 |
2020年 | 7篇 |
2019年 | 4篇 |
2018年 | 3篇 |
2017年 | 6篇 |
2016年 | 6篇 |
2015年 | 4篇 |
2014年 | 16篇 |
2013年 | 5篇 |
2012年 | 5篇 |
2011年 | 7篇 |
2010年 | 5篇 |
2009年 | 3篇 |
2008年 | 8篇 |
2005年 | 3篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1996年 | 1篇 |
1994年 | 1篇 |
排序方式: 共有115条查询结果,搜索用时 390 毫秒
21.
以人工湿地修复镉污染水体时,植物在镉离子的沉淀、吸收和积累等过程中起着关键作用,但当前报道的镉富集植物种类较少,湿地植物对镉胁迫的生长及生理响应缺乏系统研究,限制了湿地植物在镉污染水体修复中的应用。笔者以常见湿地植物水蓼(Polygonum hydropiper L.)为对象,设置了4个镉处理浓度(0、0.5、1和2 mg·L~(-1)),研究了水蓼对镉的富集特征以及生长和生理响应。水蓼根、茎和叶的镉含量(以干重计)随镉处理浓度的增加而升高,处理30 d时,在2 mg·L~(-1)处理下分别达到134、47和48 mg·kg~(-1)。处理30 d时,在1 mg·L~(-1)的镉处理下,水蓼的地上部及地下部富集系数和转运系数最高,地上部和地下部富集系数分别为45.6和111.7,转运系数为0.41。在处理15 d时,水蓼生物量、叶绿素含量和超氧化物歧化酶(SOD)活性在2 mg·L~(-1)处理下显著降低。在处理30 d时,水蓼的总生物量在不同镉浓度下无显著差异,但丙二醛(MDA)含量、SOD和过氧化氢酶(CAT)活性在0.5~2 mg·L~(-1)镉处理下均显著升高,叶绿素含量下降。这些结果表明,水蓼可以通过提高抗氧化酶活性等机理抵抗镉胁迫产生的氧化伤害,并且水蓼对镉的富集和转运系数较高,具有在镉污染水体修复中应用的潜力。 相似文献
22.
Chao Lu Kanglan Deng Chun Hu Lai Lyu 《Frontiers of Environmental Science & Engineering》2020,14(5):82
23.
Lyu Yucai Yang Tao Liu Herong Qi Zheng Li Ping Shi Ziyao Xiang Zhen Gong Dachun Li Ning Zhang Yaoping 《Environmental science and pollution research international》2021,28(16):19866-19877
Environmental Science and Pollution Research - Chromium (Cr) is one of the most widely used heavy metals in industrial processes, resulting in water and soil pollution that seriously threaten... 相似文献
24.
25.
The behaviors and fate of polycyclic aromatic hydrocarbons (PAHs) in a coking wastewater treatment plant 总被引:4,自引:0,他引:4
The occurrence, behaviors and fate of 18 PAHs were investigated in a coking wastewater treatment plant in Songshan coking plant, located in Shaoguan, Guangdong Province of China. It was found that the target compounds occurred widely in raw coking wastewater, treated effluent, sludge and gas samples. In raw coking wastewater, high molecular weight (MW) PAHs were the dominant compounds, while 3-6 ring PAHs predominated in the final effluent. The dominant compounds in gas samples were phenathrene, fluoranthene and pyrene, while they were fluoranthene, pyrene, chrysene and benzo[k]fluoranthene for sludge. The process achieved over 97% removal for all the PAHs, 47-92% of eliminations of these target compounds in liquid phase were achieved in biological stage. Different behaviors of PAHs were observed in the primary tank, anaerobic tank, aerobic tank, hydrolytic tank and coagulation tank units, while heavier and lower ones were mainly removed in anaerobic tank and aerobic tanks, respectively. Regarding the fate of PAHs, calculated fractions of mass losses for low MW PAHs due to transformation and adsorption to sludge accounted for 15-50% and 24-49%, respectively, while the rest was less than 1%. For high MW PAHs, the mass losses were mainly due to adsorption to sludge and separation with tar (contributing 56-76% and 22-39%, respectively), and the removal through transformation was less. 相似文献
26.
苯酚的生物降解一直受到关注。以苯酚为惟一电子供体,研究了Shewanellasp.XB对苯酚的缺氧降解特性。研究结果表明,在反硝化条件下,当C/N为13.3时,苯酚可以完全降解,NO2--N积累量很少。另外,当加入氧化还原介体,如核黄素3μmol/L、AQDS0.01mmol/L、AQS0.05mmol/L和LQ0.01mmol/L时,苯酚降解速率分别为不加介体时的1.45、1.77、1.67和1.63倍。当以氯化铵代替硝酸盐时,苯酚也能进行厌氧发酵降解。另外,菌株XB反硝化降解苯酚可能是厌氧和好氧降解的混合过程。 相似文献
27.
苯酚的生物降解一直受到关注。以苯酚为惟一电子供体,研究了Shewanella sp.XB对苯酚的缺氧降解特性。研究结果表明,在反硝化条件下,当C/N为13.3时,苯酚可以完全降解,NO-2-N积累量很少。另外,当加入氧化还原介体,如核黄素3μmol/L、AQDS 0.01 mmol/L、AQS 0.05 mmol/L和LQ 0.01 mmol/L时,苯酚降解速率分别为不加介体时的1.45、1.77、1.67和1.63倍。当以氯化铵代替硝酸盐时,苯酚也能进行厌氧发酵降解。另外,菌株XB反硝化降解苯酚可能是厌氧和好氧降解的混合过程。 相似文献
28.
Anthropogenic pollution and variability of manganese in alluvial sediments of the Yellow River,Ningxia, northwest China 总被引:9,自引:0,他引:9
Peiyue Li Hui Qian Ken W. F. Howard Jianhua Wu Xinsheng Lyu 《Environmental monitoring and assessment》2014,186(3):1385-1398
Heavy metal pollution of sediments is a global concern and can be a serious problem in heavily industrialized parts of the world. Pollution by manganese is particularly common due to its ubiquitous natural occurrence, ease of mobilization, and extensive association with industry. In Ningxia, China, manganese pollution of Yellow River alluvial sediments was assessed by comparing manganese concentrations in 35 sediment samples with background values derived from similar sediments obtained at sites considered remote from potential sources of contamination. Natural background values of manganese were found to range from 192 to 323 mg/kg for surface sediments, and from 220 to 325 and 283 to 394 mg/kg for subsurface sediments at depths of 45–50 and 95–100 cm, respectively. In the study area, manganese content ranged from 565 to 1,363 mg/kg, indicating anthropogenic pollution extending to a depth of at least 1 m in the study area. All 35 samples were found to exceed the threshold effect concentration (TEC) of 460 mg/kg, below which adverse effects on sediment-dwelling organisms are not expected to occur, and one sample (T12) was found to exceed the probable effect concentration (PEC) of 1,100 mg/kg. PEC defines the threshold above which adverse effects are likely to be observed. Variogram analysis of the surface sediment manganese data revealed adherence to a Gaussian model, and ordinary kriging was used to generate a manganese distribution map. Analysis of the high nugget effect ratio indicates high, small-scale variations that are consistent with potential emissions from an adjacent electrolytic manganese plant. 相似文献
29.
30.