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排序方式: 共有621条查询结果,搜索用时 31 毫秒
611.
Xianbao Shen Jiateng Hao Lei Kong Yue Shi Xinyue Cao Jiacheng Shi Zhiliang Yao Xin Li Bobo Wu Yiming Xu Kebin He 《环境科学学报(英文版)》2021,33(9):138-149
A rapid reaction occurs near the exhaust nozzle when vehicle emissions contact the air. Twenty diesel vehicles were studied using a new multipoint sampling system that is suitable for studying the exhaust plume near the exhaust nozzle. The variation characteristics of fine particle matter (PM2.5) and its components in diesel vehicle exhaust plumes were analyzed. The PM2.5 emissions gradually increased with increasing distance from the nozzle in the plume. Elemental carbon emissions remained basically unchanged, organic carbon and total carbon (TC) increased with increasing distance. The concentrations of SO42?, NO3? and NH4+ (SNA) directly emitted by the vehicles were very low but increased rapidly in the exhaust plume. The selective catalytic reduction (SCR) reduced 42.7% TC, 40% NO3? emissions, but increased 104% SO42? and 36% NH4+ emissions, respectively. In summary, the SCR reduced 29% primary PM2.5 emissions for the tested diesel vehicles. The NH4NO3 particle formation maybe more important in the plume, and there maybe other forms of formation of NH4+ (eg. NH4Cl). The generation of secondary organic carbon (SOC) plays a leading role in the generation of secondary PM2.5. The SCR enhanced the formation of SOC and SNA in the plume, but comprehensive analysis shows that the SCR more enhanced the SNA formation in the plume, which is mainly new particles formation process. The inconsistency between secondary organic aerosol (SOA) and primary organic aerosol definitions is one of the important reasons for the difference between SOA simulation and observation. 相似文献
612.
在企业HSE管理的过程中,往往容易在危险源辨识、评价方法应用等方面存在一定的误区.笔者结合工作实际,谈几点肤浅的体会. 相似文献
613.
Matrix-bound phosphine in Antarctic biosphere 总被引:5,自引:0,他引:5
Phosphine (PH(3)) is a natural gaseous carrier of phosphorus in its geochemical cycles, and it might be of importance to the phosphorus balance of natural ecosystem. For the first time phosphine levels were investigated in the Earth's coldest, driest, and most southerly Antarctic biosphere. Matrix-bound phosphine (MBP) was found in sea animal guanos, ornithogenic sediments and soils. Phosphine concentrations varied with different sea animal guanos. Average phosphine concentrations in empire penguin, gentoo penguin, sea lion, skua and gull guanos were 2.54+/-1.28 ng kg(-1), 6.21+/-2.15 ng kg(-1), 9.12+/-4.66 ng kg(-1), 11.90+/-1.29 ng kg(-1) and 14.55+/-6.74 ng kg(-1), respectively. The contents of phosphorus in these various matrixes have an important effect on MBP concentrations. The levels of phosphine appeared an increasing tendency with the content of TP, IP and OP in sea animal guanos, ornithogenic sediments or soils. The correlation between PH(3) and Fe, Mn, Al in these matrixes was also analyzed and discussed. Phosphine showed an obviously positive correlation with Fe in sea animal guanos. However, excessively high Fe, Al and Mn may inhibit the formation of PH(3) in the ornithogenic soils or sediments in the Antarctic biosphere. 相似文献
614.
Xue Qingju Kong Ming Xie Liqiang Li Tong Liao Mengna Yan Zebin Zhao Yanyan 《Environmental science and pollution research international》2022,29(58):87132-87143
Environmental Science and Pollution Research - Harmful cyanobacterial blooms are increasing in frequency and severity, which makes their toxic secondary metabolites of microcystins (MCs) have been... 相似文献
615.
616.
Cai Xin Yan Yingying Li Shuanglin Kong Shaofei Liu Mengyao Zhang Zexuan 《Environmental science and pollution research international》2022,29(11):15763-15776
Environmental Science and Pollution Research - Global tropospheric nitrogen dioxide (NO2) changes have different or even opposite impacts on the photochemical formation of ozone in different... 相似文献
617.
Yuan Liang Chen Yuying He Weijun Kong Yang Wu Xia Degefu Dagmawi Mulugeta Ramsey Thomas Stephen 《Environmental science and pollution research international》2022,29(46):69753-69770
Environmental Science and Pollution Research - Under the background that China puts forth the goals of “Emission Peak” and “Carbon Neutrality”, heavily polluting... 相似文献
618.
Zhu Benjie Jiang Guofei Kong Can Sun Junzhi Liu Fang Wang Yongqiang Zhao Chaocheng Liu Chunshuang 《Environmental science and pollution research international》2022,29(39):58716-58729
Environmental Science and Pollution Research - In order to improve the visible light response, N-doping ZnS (N-ZnS) nanospheres with Zn vacancy and porous surface were prepared by a simple one-pot... 相似文献
619.
620.
Kong Xiangke Wang Yanyan Ma Lisha Li Hui Han Zhantao 《Environmental science and pollution research international》2022,29(30):45328-45337
Environmental Science and Pollution Research - Oxidation of Cr(III) by birnessite (δ-MnO2) was an important geochemical reaction determining the toxicity and mobility of dissolved Cr(III) in... 相似文献