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531.
Qianqian Hong Cheng Liu Qihou Hu Chengzhi Xing Wei Tan Ting Liu Jianguo Liu 《环境科学学报(英文版)》2021,33(5):119-134
Information on the vertical distribution of air pollutants is essential for understanding their spatiotemporal evolution underlying urban atmospheric environment. This paper presents the SO2 profiles based on ground-based Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements from March 2018 to February 2019 in Hefei, East China. SO2 decrease rapidly with increasing heights in the warm season, while lifted layers were observed in the cold season, indicating accumulation or long-range transport of SO2 in different seasons might occur at different heights. The diurnal variations of SO2 were roughly consistent for all four seasons, exhibiting the minimum at noon and higher values in the morning and late afternoon. Lifted layers of SO2 were observed in the morning for fall and winter, implying the accumulation or transport of SO2 in the morning mainly occurred at the top of the boundary layer. The bivariate polar plots showed that weighted SO2 concentrations in the lower altitude were weakly dependent on wind, but in the middle and upper altitudes, higher weighted SO2 concentrations were observed under conditions of middle-high wind speed. Concentration weighted trajectory (CWT) analysis suggested that potential sources of SO2 in spring and summer were local and transported mainly occurred in the lower altitude from southern and eastern areas; while in fall and winter, SO2 concentrations were deeply affected by long-range transport from northwestern and northern polluted regions in the middle and upper altitudes. Our findings provide new insight into the impacts of regional transport at different heights in the boundary layer on SO2 pollution. 相似文献
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Luhua Jiang Shaobo Liu Yunguo Liu Guangming Zeng Yiming Guo Yicheng Yin Xiaoxi Cai Lu Zhou Xiaofei Tan Xixian Huang 《Environmental science and pollution research international》2017,24(30):23528-23537
This paper explored biochar modification to enhance biochar’s ability to adsorb hexavalent chromium from aqueous solution. The ramie stem biomass was pyrolyzed and then treated by β-cyclodextrin/poly(L-glutamic acid) which contained plentiful functional groups. The pristine and modified biochar were characterized by FTIR, X-ray photoelectron spectroscopy, specific surface area, and zeta potential measurement. Results indicated that the β-cyclodextrin/poly(L-glutamic acid) was successfully bound to the biochar surface. Batch experiments were conducted to investigate the kinetics, isotherm, thermodynamics, and adsorption/desorption of Cr(VI). Adsorption capacities of CGA-biochar were significantly higher than that of the untreated biochar, and its maximum adsorption capacity could reach up to 197.21 mg/g at pH 2.0. Results also illustrated that sorption performance depended on initial solution pH; in addition, acidic condition was beneficial to the Cr(VI) uptake. Furthermore, the Cr(VI) uptake was significantly affected by the ion strength and cation species. This study demonstrated that CGA-biochar could be a potential adsorbent for Cr(VI) pollution control. 相似文献
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湖北长江经济带洪灾机制与对策探讨 总被引:2,自引:0,他引:2
谭术魁 《长江流域资源与环境》1994,3(4):353-357
根据湖北长江经济带的洪灾历史,分析了致灾原因,并提出了抗灾、减灾对策。 相似文献
539.
本文根据系统思想,提出了一种新的用于环境水力学研究的高效率座标测量方法。经现场试验证明,该法与传统方法相比可提高工作效率数倍。 相似文献
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MetbodologyofenvironmentalimpactassessmentforregionaldevelopmentZhuTan;ChenWei(DepartmentofEnvironmentScienceofNankaiUniversi... 相似文献