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排序方式: 共有1877条查询结果,搜索用时 93 毫秒
711.
矿区土地复垦是实现土地可持续利用的重要环节,土地复垦中的资金落实,复垦技术利用关系到复垦工作的成败与进展快慢。 相似文献
712.
Pollution characteristics and health risk assessment of benzene homologues in ambient air in the northeastern urban area of Beijing, China 总被引:6,自引:0,他引:6
Lei Li Hong Li Xinmin Zhang Li Wang Linghong Xu Xuezhong Wang Yanting Yu Yujie Zhang Guan Cao 《环境科学学报(英文版)》2014,26(1):214-223
Ambient benzene homologues were measured at a site in the northeastern urban area of Beijing, China, from August 24 to September 4, 2012 by SUMMA canister sampling followed by laboratory determination using cryogenic cold trap pre-concentration-GC-MS/FID, and their health risks were also assessed. Daily total benzene homologues ranged from 0.99 to 49.71 μg/m3with an average of 11.98 μg/m3. Benzene homologues showed higher concentrations in the morning and evening than that at noontime. Comparison with previous studies revealed a trend of decrease for ambient benzene homologues probably due to the efective emission control in Beijing in recent years. Vehicular exhaust was the main source while volatilization of paints and solvents also made substantial contributions. Health risk assessment showed that BTEX(benzene, toluene, ethylbenzene, o-xylene, m-xylene and p-xylene) and styrene had no appreciable adverse non-cancer health risks for the exposed population, while benzene has potential cancer risk of 1.34E-05. Available data from cities in China all implied that benzene imposes relatively higher cancer risk on the exposed populations and therefore strict control measures should be taken to further lower ambient benzene levels in China. 相似文献
713.
Potential of weed species applied to remediation of soils contaminated with heavy metals 总被引:1,自引:1,他引:1
WEI Shu-he ZHOU Qi-xing WANG Xin CAO Wei REN Li-pingx REN Li-ping SONG Yu-fang 《环境科学学报(英文版)》2004,16(5):868-873
To screen out a series of ideal plants that can effectively remedy contaminated soils by heavy metals is the main groundwork of phytoremediation engineering and the first step of its commercial application on a large scale. In this study, accumulation and endurance of 45 weed species in ]6 families from an agricultural site were in situ examined by using the pot-culture field experiment, and the remediation potential of some weed species with high accumulation of heavy metals was assayed. The results showed that Solanum nigrum and Conyza canadensis can not only accumulate high concentration of Cd, but also strongly endure to single Cd and Cd-Pb-Cu-Zn combined pollution. Thus 2 weed species can be regarded as good hyperaccumulators for the remediation of Cd-contaminated soils. Although there were high Cd-accumulation in Artemigia selengensis, Znula britannica and Cephalanoplos setosum, their biomass was adversely affected due to action of heavy metals in the soils. If the problem of low endurance to heavy metals can be solved by a reinforcer, 3 weed species can be perhaps applied commercially. 相似文献
714.
土地生态功能的特点与保护 总被引:7,自引:0,他引:7
土地的生态功能指在物质、能量迁移与转化过程中,土地所表现的能够满足和维持生物体以及人类生活需要的自然环境条件和效用。它包括生态环境的调节功能和生物支持功能两大类,具有整体性、关联性、空间地域性和时间动态性等特征。其中,生态环境的调节功能可分为保护土壤功能、防风固沙、涵养水源功能、调节微气候功能、净化环境功能等五类;生物支持功能主要指产生与维持生物多样性,为生物提供良好的栖息环境。土地的生态功能除了受地形地貌、土壤、气候、水、植物等自然条件的制约外,还受土地利用方式、土地利用结构和区域土地政策等社会经济因素的影响。 相似文献
715.
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717.
着重介绍了蒙城地震台FBS-3系统标定参数的测定与计算,同时也总结了标定软件使用的步骤和注意事项.对仪器进行日常脉冲标定、特定情况下的正弦波标定可以对仪器系统的工作状态有一个量化的评定,以此来判定仪器性能的变化及其稳定程度.2006年7月份,对FBS-3数字化测震观测系统进行了一次标定,此次标定作为每年一次系统正弦波标定的最终结果.与2005年7月份标定结果对比分析,两次标定结果差别不大,符合规范要求,观测系统性能稳定. 相似文献
718.
超滤法从造纸黑液中提取木质素制备活性炭 总被引:20,自引:1,他引:20
应用超滤技术从造纸黑液中提取木质素制备活性炭是黑液综合治理的一条新途径,且适合于中、小型造纸厂。经超滤处理过的黑液,COD去除率达到60%-65%,BOD5去除率达到80%以上。黑液中木质素提取率达到80%-85%,由木质素制成的活性炭得率高,吸附容量大,其主要技术指标均优于沪Q/HG11-224-87的标准。 相似文献
719.
Yuanyuan Song Lifang Zhao Zenghua Qi Yanhao Zhang Guodong Cao Ruijin Li Lin Zhu Zhu Yang Chuan Dong Zongwei Cai 《环境科学学报(英文版)》2021,33(7):64-70
Simulation of fine particulate matter (PM2.5) exposure is essential for evaluating adverse health effects. In this work, an ambient exposure system that mimicked real atmospheric conditions was installed in Taiyuan, China to study impacts of chronic PM2.5 exposure on adult and aged mice as well as Sirtuin3 knockout (Sirt3 KO) mice and wild-type (WT) mice. The real-ambient exposure system eliminated the possible artificial effects caused from exposure experiments and maintained the physiochemical characteristics of PM2.5. The case studies indicated that aged mice exhibited apparent heart dysfunction involving increased heart rate and decreased blood pressure after 17-week of real-ambient PM2.5 exposure. Meanwhile, 15-week of real-ambient PM2.5 exposure decreased the heart rate and amounts of associated catecholamines to induce heart failure in Sirt3 KO mice. Additionally, the increased pro-inflammatory cytokines and decreased platelet related indices suggested that inflammation occurred. The changes of biomarkers detected by targeted metabolomics confirmed metabolic disorder in WT and Sirt3 KO mice after exposed to real-ambient PM2.5. These results indicated that the real-ambient PM2.5 exposure system could evaluate the risks of certain diseases associated with air pollution and have great potential for supporting the investigations of PM2.5 effects on other types of rodent models. 相似文献
720.