Nitrogen dioxide（NO2） is one of the most common and harmful air pollutants. To analyze the response of plants to NO2 stress, we investigated the morphological change, reactive oxygen species（ROS） production and an...Nitrogen dioxide（NO2） is one of the most common and harmful air pollutants. To analyze the response of plants to NO2 stress, we investigated the morphological change, reactive oxygen species（ROS） production and antioxidant enzyme activity in Arabidopsis thaliana（Col-0） exposed to 1.7, 4, 8.5, and 18.8 mg/m3NO2. The results indicate that NO2 exposure affected plant growth and chlorophyll（Chl） content, and increased oxygen free radical（O2-）production rate in Arabidopsis shoots. Furthermore, NO2 elevated the levels of lipid peroxidation and protein oxidation, accompanied by the induction of antioxidant enzyme activities and change of ascorbate（As A） and glutathione（GSH） contents. Following this, we mimicked nitric acid mist under experimental conditions, and confirmed the antioxidant mechanism of the plant to the stress. Our results imply that NO2 and its acid mist caused pollution risk to plant systems. During the process, increased ROS acted as a signal to induce a defense response, and antioxidant status played an important role in plant protection against NO2/nitric acid mist-caused oxidative damage.展开更多
对2家燃煤电厂湿法烟气脱硫（wet flue gas desulfurization,WFGD）系统前后细颗粒及SO_3酸雾进行了测试分析,对比分析了单塔、双塔脱硫工艺、燃煤组分等与细颗粒物和SO_3酸雾脱除作用的关系。结果表明,双塔WFGD系统对细颗粒物和SO_3酸...对2家燃煤电厂湿法烟气脱硫（wet flue gas desulfurization,WFGD）系统前后细颗粒及SO_3酸雾进行了测试分析,对比分析了单塔、双塔脱硫工艺、燃煤组分等与细颗粒物和SO_3酸雾脱除作用的关系。结果表明,双塔WFGD系统对细颗粒物和SO_3酸雾的脱除效率明显高于单塔系统。WFGD系统入口细颗粒物粒径分布相似,脱硫后细颗粒物粒径分布向小粒径方向迁移,同时PM_（2.5）相对比例有所增加,双塔脱硫系统更为明显。WFGD系统在脱除燃煤烟气中颗粒物的同时,本身也会形成新的细颗粒物,其主要成分为硫酸钙,呈板状及棱柱状。单塔、双塔WFGD系统对燃煤烟气中SO_3酸雾的脱除效率范围分别介于30%~40%、50%~65%,随着塔入口烟气中SO_3及颗粒物浓度的增加,其脱除效率有所提高;燃用高硫煤时,会出现蓝烟现象。展开更多
基金supported by the National Natural Science Foundation of China (Nos.21477070, 21377076)the Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP) (Nos.20121401110003, 20131401110005)+2 种基金the Project for Science and Technology Development of Shanxi Province (No.20120313009-2)the Research Project supported by the Shanxi Scholarship Council of China (No.2012-009)the Program for the Top Young and Middle aged Innovative Talents of Higher Learning Institutions of Shanxi (TYMIT, No.20120201)
文摘Nitrogen dioxide（NO2） is one of the most common and harmful air pollutants. To analyze the response of plants to NO2 stress, we investigated the morphological change, reactive oxygen species（ROS） production and antioxidant enzyme activity in Arabidopsis thaliana（Col-0） exposed to 1.7, 4, 8.5, and 18.8 mg/m3NO2. The results indicate that NO2 exposure affected plant growth and chlorophyll（Chl） content, and increased oxygen free radical（O2-）production rate in Arabidopsis shoots. Furthermore, NO2 elevated the levels of lipid peroxidation and protein oxidation, accompanied by the induction of antioxidant enzyme activities and change of ascorbate（As A） and glutathione（GSH） contents. Following this, we mimicked nitric acid mist under experimental conditions, and confirmed the antioxidant mechanism of the plant to the stress. Our results imply that NO2 and its acid mist caused pollution risk to plant systems. During the process, increased ROS acted as a signal to induce a defense response, and antioxidant status played an important role in plant protection against NO2/nitric acid mist-caused oxidative damage.
文摘对2家燃煤电厂湿法烟气脱硫（wet flue gas desulfurization,WFGD）系统前后细颗粒及SO_3酸雾进行了测试分析,对比分析了单塔、双塔脱硫工艺、燃煤组分等与细颗粒物和SO_3酸雾脱除作用的关系。结果表明,双塔WFGD系统对细颗粒物和SO_3酸雾的脱除效率明显高于单塔系统。WFGD系统入口细颗粒物粒径分布相似,脱硫后细颗粒物粒径分布向小粒径方向迁移,同时PM_（2.5）相对比例有所增加,双塔脱硫系统更为明显。WFGD系统在脱除燃煤烟气中颗粒物的同时,本身也会形成新的细颗粒物,其主要成分为硫酸钙,呈板状及棱柱状。单塔、双塔WFGD系统对燃煤烟气中SO_3酸雾的脱除效率范围分别介于30%~40%、50%~65%,随着塔入口烟气中SO_3及颗粒物浓度的增加,其脱除效率有所提高;燃用高硫煤时,会出现蓝烟现象。
