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排序方式: 共有427条查询结果,搜索用时 31 毫秒
141.
Xiaoyu Hu Gan Yang Yiliang Liu Yiqun Lu Yuwei Wang Hui Chen Jianmin Chen Lin Wang 《环境科学学报(英文版)》2022,34(3):190-203
Organic acids are important contributors to the acidity of atmospheric precipitation,but their existence in the Chinese atmosphere is largely unclear.In this study,twelve atmospheric gaseous organic acids,including C1-C9 alkanoic acids,methacrylic acid,pyruvic acid,and benzoic acid,were observed in the suburb of Wangdu,Hebei Province,a typical rural site in the northern China plain from 16th December,2018 to 22nd January,2019,using a Vocus@Proton-Trans... 相似文献
142.
Jun Li Wentao Li Gan Luo Yan Li Aimin Li 《Frontiers of Environmental Science & Engineering》2019,13(1):6
143.
2005年10月22日至2006年10月21日,在云南腾冲一典型背景点进行了每周一次的大气采样,以监测季风期东南亚地区生物质燃烧导致的多环芳烃(PAHs)的输入状况.结果表明,监测期内总PAHs含量为43.1~156ng/m3 (平均值为87.9ng/m3).其中气相PAHs均值为85.8ng/m3,无明显的季节变化;颗粒相PAHs均值为2.35ng/m3,在春季出现显著高值,可能与东南亚生物质燃烧释放的PAHs在南亚季风作用下向腾冲的跨境迁移有关.颗粒相PAHs以毒害性较大的高环PAHs化合物为主,其在偏远地区生态系统中的累积可能带来一定的生态风险. 相似文献
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政府环境报告基层实施是利用县级人大与公众直接联系的"基层"优势加强对政府环境责任监督的有效手段。实践中,报告主体及对象级别各异,报告内容繁简不一,总体情况为越是基层贯彻实施政府环境报告的力度越弱,存在报告形式不明确、信息公开不到位、常态化监督机制和政府责任缺失等问题。因此,必须在认清立法目的的基础上合理运用法律解释明确报告的法律属性,规范报告内容、扩大公开范围,利用"基层"优势与公众加强联系,并在准确定位环保法的前提下构建人大监督的刚性约束。 相似文献
146.
HydroShare: Sharing Diverse Environmental Data Types and Models as Social Objects with Application to the Hydrology Domain
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148.
Passive air monitoring of PCBs and PCNs across East Asia: a comprehensive congener evaluation for source characterization 总被引:1,自引:0,他引:1
Hogarh JN Seike N Kobara Y Habib A Nam JJ Lee JS Li Q Liu X Li J Zhang G Masunaga S 《Chemosphere》2012,86(7):718-726
A comprehensive congener specific evaluation of polychlorinated biphenyls (PCBs) and polychlorinated naphthalenes (PCNs) in the atmosphere was conducted across East Asia in spring 2008, applying polyurethane foam (PUF) disk passive air sampler (PAS) as monitoring device. Mean concentrations derived for Japan, China and Korea were 184 ± 24, 1100 ± 118, and 156 ± 20 pg m−3 for ∑202 PCBs, and 9.5 ± 1.5, 61 ± 6, and 16 ± 2.4 pg m−3 for ∑63 PCNs, respectively. Relative to reported data from 2004, the present results suggest that air PCBs concentrations have not changed much in Japan and Korea, while it has increased by one order of magnitude in China. From principal component analysis, combustion emerged highly culpable in contemporary emissions of both PCBs and PCNs across the East Asian sub-region. Another factor derived as important to air PCBs was re-emissions/volatilization. Signals from PCBs formulations were also picked, but their general importance was virtually consigned to the re-emissions/volatilization tendencies. On the contrary, counterpart PCNs formulations did not appear to contribute much to air PCNs. 相似文献
149.
Effects of hydrodynamics on the distribution of trace persistent organic pollutants and macrobenthic communities in Bohai Bay 总被引:4,自引:0,他引:4
In recent years, the rapid economic development along Bohai Bay, has brought out continuous increasing of the pollution loads in the Bohai Sea, especially by the large coastal reclamation project, Tianjin Binhai New Area. In the period of 2007-2009, we collected the sediments of the main rivers, estuaries, intertidal zone, and near-shore area of Bohai Bay, and Macrobenthos associated with the marine sediments to assess the influence of hydrodynamics in the coastal environment on the pattern of trace contaminants and the macrobenthic community. Based on data derived from these samples, the levels of polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs) in sediments followed the order PAHs > OCPs > PCBs > PBDEs. The higher concentrations of PCBs, OCPs, PAHs and PBDEs were found in the estuarine and near-shore environment of the Dagu Drainage River. The spatial distribution of OCPs was different to that of PCBs due to the direction of the velocity field of Bohai Bay in its old and new topography, and the higher water-solubility of OCPs than that of PCBs. The results of the Pearson correlation and the PCA indicate that the medium diameter (MD) of sediments was the predominant factor influencing the distribution of PCBs and OCPs, most sampling sites were characterized mainly by TOC of sediments and biomass of macrobenthos. The results indicate that the distribution of trace contaminants and macrobenthic community in Bohai Bay are mainly affected by the hydrodynamic conditions. 相似文献
150.