全文获取类型
收费全文 | 111篇 |
免费 | 3篇 |
国内免费 | 13篇 |
专业分类
安全科学 | 2篇 |
废物处理 | 3篇 |
环保管理 | 12篇 |
综合类 | 60篇 |
基础理论 | 6篇 |
污染及防治 | 33篇 |
评价与监测 | 11篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 3篇 |
2019年 | 2篇 |
2018年 | 1篇 |
2017年 | 4篇 |
2016年 | 4篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 3篇 |
2012年 | 3篇 |
2011年 | 7篇 |
2010年 | 5篇 |
2009年 | 8篇 |
2008年 | 5篇 |
2007年 | 9篇 |
2006年 | 9篇 |
2004年 | 5篇 |
2003年 | 3篇 |
2002年 | 7篇 |
2001年 | 9篇 |
2000年 | 8篇 |
1999年 | 3篇 |
1998年 | 6篇 |
1997年 | 2篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1981年 | 1篇 |
排序方式: 共有127条查询结果,搜索用时 15 毫秒
91.
92.
研究了在Fenton试剂和光助Fenton试剂作用下,苯酚降解的反应条件。研究结果表明。反应的时间、初始pH值、H2O2和Fe^2+浓度对Fenton反应都有影响。常温下,当H2O2浓度为20mmol/L,Fe^2+浓度为4mmol/L时,pH为1,反应时间为30min时,苯酚的转化率达到98%,矿化率达到65%以上。光助Fenton法可以大幅度提高含酚废水的降解率。 相似文献
93.
94.
测定了长时间保存的1.0000g/L苯酚贮备液的浓度和标样。结果表明此浓度的苯酚贮备液可在3年内保持稳定。 相似文献
95.
96.
The objective of this work is to examine the influence of oxalic acid formed on the degradation of phenol by Fenton reagent. Oxalic acid formed at initial stage within 30 min significantly suppresses the reduction of ferric ion, thus terminating degradation reaction. The yield of oxalic acid is dependent on the amount of ferrous ion dosed since the minimal amount of oxalic acid is formed after the degradation reaction terminates. Mineralization of phenol by Fenton reagent stagnates after 120 min under the conditions used in this study. The reason why the mineralization stagnated can be assumed to be following two mechanisms other than the depletion of H2O2. In the case where a small amount of ferrous ions is dosed, the reduction of ferric ions is minimal by oxalic acid formed. In the case where a large amount of ferrous ions is dosed, the amount of degradable organic compounds is insufficient owing to preferential conversion to oxalic acid. The mineralization can be enhanced by the intermittent dosing of ferrous ions, which facilitates the suppression of oxalic acid formation during the degradation by Fenton reagent. 相似文献
97.
Fernando M. Lanças Igor R. B. Olivares Priscila M. Alves 《Journal of environmental science and health. Part. B》2013,48(5):491-498
In this work the development, validation and application of method using Solid Phase Microexctration (SPME) for the analyses of five pollutants (phenol, 2-nitrophenol, 2,4-dimethylphenol, 2,4-dichlorophenol and 4-chloro, 3-methyl phenol) in supplying water, using gas chromatography (GC) with flame ionization detector (FID) is described. The optimal conditions obtained for SPME were: fiber type: Poliacrylate (PA); extraction time: 40 minutes; extraction temperature: 70°C; amount of salt added to sample (NaCl): 15%; desorption temperature: 8 minutes. The parameters studied in the method validation were: limit of detection (0.3 and 3.5 μ g.L? 1); precision, measured by the variation coefficient (between 2.1 and 8.8%); calibration curve and linearity, by using the external standardization method (between 1 and 50 50 μ g.L? 1). After the methodology development, samples of water collected in Atibaia River (São Paulo - Brazil) were analyzed, using the optimized methodology. Three water samples collected in the rain season showed a peak with retention time close to 4-chloro, 3 methyl phenol further analyzed by Gas Chromatography-Mass Spectrometry for the identity confirmation. In spite of the fact that none target compounds were found in the river water samples analyzed, the presence of two phenols different from those investigated (p-terc butyl phenol; butylated hydroxytoluene) were detected. These results together with the results of the limit of detection (that showed to be lower than the maximum concentration of phenols demanded by different environment control agencies), and the results of the validation, indicate the applicability of this method for the analysis of selected phenols in river water samples. 相似文献
98.
应用差示光度法的有关原理及朗伯比耳定律的最佳适用范围,在光度计测量误差较小的最佳测量范围内测量样品的吸光值。结果表明对地表水挥发酚的检测,本法与4-氨基安替比林(4AAP)萃取光度法相比准确度达到95%,精密度良好。 相似文献
99.
高效液相色谱法同时测定苯酚及其氯化中间产物 总被引:4,自引:0,他引:4
采用高效液相色谱法同时测定次氯酸钠氧化降解苯酚过程中苯酚及其5种氯化中间体,确定了检测波长,讨论了pH值对测定的影响。方法线性良好,苯酚、2-氯苯酚、4-氯苯酚、2,6-二氯苯酚、2,4-二氯苯酚、2,4,6-三氯苯酚的检出限分别为0.01mg/L、0.02mg/L、0.02mg/L、0.02mg/L、0.02mg/L、0.02mg/L,标准溶液测定的相对标准偏差≤0.8%,样品加标回收率为96.0%~102%。 相似文献
100.
固相萃取-高效液相色谱法测定饮用水中酚类化合物 总被引:2,自引:0,他引:2
采用固相萃取-高效液相色谱法测定饮用水中酚类化合物,优化了试验条件。方法在0 mg/L~40.0 mg/L范围内线性良好,14种酚类化合物的检出限为0.6μg/L~2.6μg/L,水样平行测定的RSD为0.2%~2.7%,加标回收率为96.3%~99.9%。 相似文献