检索结果-内蒙古大学图书馆

Occurrence and Health Risks of Halogenated Flame Retardants in Soils: Association with E-Waste Dismantling, Urbanization and Industrialization

学校读者我要写书评

暂无评论

SSRN 2022年

Rapid urbanization and industrialization lead to high emissions and accumulation of halogenated flame retardants (HFRs), which seriously stress the health of the eco-environment. To explore the impacts of urbanization and industrialization on the occurrence and health risks of HFRs, the concentrations of HFRs including dechlorane plus (DP), short-chain chlorinated paraffins (SCCPs), polychlorinated biphenyls (PCBs), and polybrominated diphenyl ethers (PBDEs) in 209 surface soil samples from E-waste dismantling areas, industrialized and urban areas, rural areas, and background areas of Zhejiang Province, China were investigated. The concentrations of DP, SCCPs, PCBs, and seven PBDEs were in the ranges of below detection limit (BDL)–3.60 (mean = 0.14), BDL–1736.00 (mean = 111.00), BDL–15.00 (mean = 1.20), and BDL–25.00 (mean = 0.30) ng/g dw, respectively. The concentrations of BDE-209 were in the range of 0.16–648 ng/g dw. The average concentrations of HFRs were in the order of E-waste dismantling areas > industrialized and urban areas > rural areas > background areas, which indicated that industrialization and urbanization controlled the spatial distribution of HFRs. The SCCPs concentrations were significantly correlated with the gross industrial output value of cities in Zhejiang Province, thereby suggesting that the exact level of soil contamination by SCCPs can be predicted by local industrialization. The health risks of PCBs and PBDEs were at acceptable levels. © 2022, The Authors. All rights reserved.

关键词： Organic pollutants

Flowerlike Co-MOFs Catalyzed Chemiluminescence for Sensitive Detection of Tetrachlorophenquinone in Environmental Waters

学校读者我要写书评

暂无评论

SSRN 2024年

作者： Wang, Ping Chen, Qiulian Xiang, Chengxin Zhu, Guonian Luo, Yue Mokeira, Kerage Dorothy Wu, Jialun Xu, Shuxia Chen, Yong Hou, Xiaoling Chengdu Ecological and Environmental Monitoring Center of Sichuan Province Sichuan Chengdu610066 China College of Ecology and Environment Chengdu University of Technology Sichuan Chengdu610059 China State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution Chengdu University of Technology Sichuan Chengdu610059 China

Tetrachlorobenzoquinone (TCBQ) as one of the most toxic quinones has potential risk of causing canceration, and the monitoring of TCBQ in the environment is of significant importance. In this study, a flowerlike Co-PTA-400(Ar) metal organic frameworks (MOF) catalyzed TCBQ-H2O2 chemiluminescence (CL) system was established for sensitive determination of trace TCBQ in environmental waters. The reaction between TCBQ and H2O2 can result in weak CL emission, and the CL signal was enhanced about10-fold using flowerlike Co-PTA-400(Ar) as catalyst. The luminescence mechanism was investigated through kinetic studies and free radical scavenging experiments. The strong CL emission of TCBQ mainly relied on the generation of abundant •OH by the catalysis of Co-PTA-400(Ar). This strategy allows to develop a highly sensitive method for the determination of TCBQ in the linear range of 1~50 μM, with a detection limit of 0.56 μM (3s). The proposed method was applied for analysis of three spiked water samples with recoveries ranging from 95.7% to 100.5%. This method offering the advantages of rapid analysis, low costs, and high sensitivity, is appealing for detection of TCBQ in environmental waters. © 2024, The Authors. All rights reserved.

关键词： Cobalt

Effect of C/N Ratio on Nitrogen Removal of A/O-MBBR Process for Treating Mariculture Wastewater

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2021年第4期20卷 879-885页

作者： CHEN Xi XIANG Zhuangzhuang HUANG Xiao RONG Huimin BAI Jie ZHAO Yangguo College of Marine Life Science Ocean University of ChinaQingdao 266003China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Nanjing University of Information Science and Technology Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologyJiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlNanjing 210044China Key Laboratory of Marine Environment and Ecology(Ocean University of China)Ministry of Education Qingdao 266100China

In order to explore the effect of carbon and nitrogen(C/N)ratio on the performance of anoxic/aerobic-moving bed bio-film reactor(A/O-MBBR)process for treating mariculture wastewater,a laboratory-scale A/O-MBBR was *** results showed that the reduction of C/N ratio was conducive to improving the removal efficiency of chemical oxygen demand(COD)and ammonia nitrogen(NH_(4)^(+)-N),while inhibiting that of nitrite nitrogen(NO_(2)^(−)-N)and nitrate nitrogen(NO_(3)^(−)-N).The extracellular polymeric substances(EPS)in anoxic zone were significantly higher in concentration than that in aerobic zone although they both declined with decrease of C/N *** result provides solid support for better controlling the pollution of mariculture wastewater.

关键词： mariculture wastewater C/N ratio A/O-MBBR process EPS

Aqueous production of sulfur-containing aerosols from nitroaromatic compounds and SO2 in wintertime urban haze

学校读者我要写书评

暂无评论

Science Bulletin 2025年第11期70卷 1846-1855页

作者： Yang, Ning Wang, Junfeng Jacob, Daniel J. Ye, Jianhuai Sheng, Ming Niu, Mutong Qin, Yiming Ge, Xinlei Sun, Yele Wang, Zifa Wang, Yuhang Wu, Fengchang Liu, Cong-Qiang George, Christian Fu, Pingqing Institute of Surface-Earth System Science School of Earth System Science Tianjin University Tianjin300072 China School of Emergency Management Nanjing University of Information Science and Technology Nanjing210044 China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing210044 China John A. Paulson School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen518055 China School of Energy and Environment City University of Hong Kong Hong Kong999077 China LAPC Institute of Atmospheric Physics Chinese Academy of Sciences Beijing100029 China School of Earth and Atmospheric Sciences Georgia Institute of Technology AtlantaGA02115 United States State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China Université Claude Bernard Lyon 1 CNRS IRCELYON VilleurbanneF-69626 France

Nighttime aqueous oxidation of fossil fuel emissions is a significant source of atmospheric secondary organic aerosols. However, the underlying mechanism of the aqueous processing remains unclear. Utilizing ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry of water-soluble organic carbon samples, we present field observations that reveal the aqueous-phase conversion of nitroaromatic compounds (NACs) and sulfur-containing aerosols from fossil fuel combustion at high relative humidity during a severe haze event in Beijing in the winter of 2016. We have confirmed that the ring-breaking oxidation of NACs can generate nitrous acid in the aqueous phase, which rapidly oxidizes sulfur dioxide (SO2) to sulfate. Subsequently, reactions between sulfate and unsaturated compounds contribute to the formation of aliphatic organosulfates. Our results elucidate a molecular-level understanding of the aqueous production of sulfur-containing aerosols from NACs and SO2 in wintertime urban haze. © 2025 Science China Press

关键词： Sulfur dioxide

Atmospheric Hono Emissions in China: Unraveling the Spatiotemporal Patterns and Their Key Influencing Factors

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Gan, Cong Li, Baojie Dong, Jinyan Li, Yan Zhao, Yongqi Wang, Teng Yang, Yang Liao, Hong Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing210044 China College of Oceanography Hohai University Nanjing210013 China

Nitrous acid (HONO) can be photolyzed to produce hydroxyl radicals (OH). OH plays a crucial role in forming ozone (O3) and secondary organic aerosols (SOA) via various oxidation reactions. Despite the abundance of recent HONO studies, research on national HONO emissions in China remains relatively limited. Therefore, this study employed the "wetting-drying" model and developed a high-resolution gridded inventory of HONO emissions for mainland China using multiple data such as land-cover types, fertilization, temperature, precipitation, and soil physical and chemical properties. We used the Monte Carlo method to estimate the uncertainty in HONO emissions. In addition, the primary sources of HONO emissions were identified and their spatiotemporal distribution and main influencing factors were studied. The results indicated that the total HONO emissions in mainland China in 2016 were 0.68 Tg N (0.47–0.91 Tg N), with cropland (0.29 Tg N) and fertilization (0.25 Tg N) as the primary sources, jointly contributing to over 78% of the ***, the North China Plain (NCP) had the highest HONO emission density (3.11 kg N/ha/yr). Seasonal HONO emissions followed the order: summer (0.36 g N/ha) > spring (0.16 g N/ha) > autumn (0.15 g N/ha) > winter (0.04 g N/ha). Moreover, HONO emissions displayed positive correlations with fertilization (r = 0.85), cropland (r = 0.72), temperature (r = 0.84), and precipitation (r = 0.63), and a negative correlation with wind speed (r = -0.24). This study provides vital scientific groundwork for the atmospheric nitrogen cycle and the formation of secondary pollutants. © 2023, The Authors. All rights reserved.

关键词： Monte Carlo methods

Effects of phosphorus species and zinc stress on growth and physiology of the marine diatom Thalassiosira weissflogii

学校读者我要写书评

暂无评论

Chemosphere 2023年第1期337卷 139308页

作者： Jiao, Kailin Yang, Hang Huang, Xuguang Liu, Fengjiao Li, Shunxing College of Chemistry Chemical Engineering & Environmental Science Minnan Normal University Zhangzhou363000 China Fujian Province University Key Laboratory of Pollution Monitoring and Control Minnan Normal University Zhangzhou363000 China Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology Minnan Normal University Zhangzhou363000 China

Human activities, including industrial and agricultural production, as well as domestic sewage discharge, have led to heavy metal pollution and eutrophication in coastal waters. This has caused a deficiency of dissolved inorganic phosphorus (DIP), but an excess dissolved organic phosphorus (DOP) and high concentrations of zinc. However, the impact of high zinc stress and different phosphorus species on primary producers remains unclear. This study examined the impact of different phosphorus species (DIP and DOP) and high zinc stress (1.74 mg L−1) on the growth and physiology of the marine diatom Thalassiosira weissflogii. The results showed that compared to the low zinc treatment (5 μg L−1), high zinc stress significantly decreased the net growth of T. weissflogii, but the decline was weaker in the DOP group than in the DIP group. Based on changes in photosynthetic parameters and nutrient concentrations, the study suggests that the growth inhibition of T. weissflogii under high zinc stress was likely due to an increase in cell death caused by zinc toxicity, rather than a decrease in cell growth caused by photosynthesis damage. Nonetheless, T. weissflogii was able to reduce zinc toxicity by antioxidant reactions through enhancing activities of superoxide dismutase and catalase and by cationic complexation through enhancing extracellular polymeric substances, particularly when DOP served as the phosphorus source. Furthermore, DOP had a unique detoxification mechanism by producing marine humic acid, which is conducive to complexing metal cations. These results provide valuable insights into the response of phytoplankton to environmental changes in coastal oceans, particularly the effects of high zinc stress and different phosphorus species on primary producers. © 2023 Elsevier Ltd

关键词： Heavy metals

Spatial distribution and risk assessments of mercury in topsoils of Central Asia

学校读者我要写书评

暂无评论

Geoscience Frontiers 2023年第4期14卷 270-279页

作者： Zhengzheng Yang Junming Guo Shiwei Sun Dingming Ni Pengfei Chen Dipesh Rupakheti Huhu Kang Sabur F Abdullaev Salamat Abdyzhapar uulu Shichang Kang Key Laboratory of Western China's Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing 210044China S.U.Umarov Physical Technical Institute of the National Academy of Sciences of Tajikistan Dushanbe 734063Tajikistan Research Center for Ecology and Environment of Central Asia(Bishkek) 720001Kyrgyzstan Geography Department Geology InstituteNational Academy of Sciences720001Kyrgyzstan

Central Asia is one of the largest arid areas on earth,yet little is known about the concentration levels and risks of mercury(Hg)in the soils of this *** this study,extensive sampling of topsoils(0-10 cm)from representative landscapes was carried out over Central Asia(i.e.,Tajikistan,Uzbekistan,and Kyrgyzstan).The total mercury(THg)concentrations in topsoils varied widely from 1.6 to 908.0 ng/g,with high values observed in samples collected in the capital cities and urban *** THg concentrations among different landscapes showed a decreasing order of urban(79.8±184.0 ng/g)>woodland(27.3±28.9 ng/g)>grassland(20.6±15.9 ng/g)>farmland(18.3±9.5 ng/g)>desert(12.3±8.0 ng/g).High THg concentrations were found in the capital cities/urban clusters,followed by a gradual decrease towards the *** concentrations were found to be negatively correlated with the distance from the sampling sites to their nearest cities,indicating that anthropogenic emissions significantly influenced the spatial distribution of topsoil Hg.A significant correlation between THg concentrations and topsoil total organic carbon(TOC)contents was also observed,suggesting that TOC played an essential role in the spatial distribution of topsoil *** assessments of pollution and potential ecological risk suggested that topsoils in highly densely-populated areas were contaminated by Hg and had higher degrees of potential ecological *** health risk assessment results showed that the exposure risk of topsoil Hg to children was higher than that to ***,there was no unacceptable human health risk of topsoil *** study clarified the spatial distribution and risks of Hg in the Central Asian topsoils,offering new insight into the risk prevention and control of soil Hg.

关键词： Mercury Topsoil Landscape Spatial distribution Risk assessment Central Asia

Simultaneous Removal of Phosphorus and Organic Matter in Municipal Tail Water Enhanced by Fe2+/S2O82- System: Parameter Optimization, Efficiency, Mechanism

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Gao, Yaoyao Kong, Xiangji Huang, Xiao Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Nanjing University of Information Science & Technology Nanjing210044 China Nanjing Institute of Environmental Science Ministry of Ecology and Environment of the People’s Republic of China Key Laboratory of Pesticide Environment Assessment and Pollution Control Ministry of Ecology and Environment of the People’s Republic of China Nanjing210042 China Shenzhen518055 China

The simultaneous removal of phosphorus (TP) and organic matter is a very ingenious process and has attracted much attention. A Fe2+/S2O82- system was constructed to advanced treat TP and organic matter in sewage. The influencing factors and degradation mechanism were investigated. The results showed that the parameters of Fe2+/P and S2O82-/Fe2+ were optimized to be 5 and 4, respectively. The molar ratio of S2O82-/Fe2+ was 4, the removal performance of TP and target oriented curriculum (TOC) was the best, and the increase of temperature was beneficial to the removal of TP and TOC. The precipitate in the secondary effluent was mainly ferric phosphate. The TP removal mechanism lied in the removal by the formation of Fe4(PO4)3(OH)3 precipitation. And protein macromolecular organic matter is degraded into small molecular organic matter such as methane (CH4) for subsequent use as a high-quality carbon source. © 2023, The Authors. All rights reserved.

关键词： Degradation

MICP as a potential sustainable technique to treat or entrap contaminants in the natural environment:A review

学校读者我要写书评

暂无评论

Environmental Science and Ecotechnology 2021年第2期6卷 13-20页

作者： Adharsh Rajasekar Stephen Wilkinson Charles K.S.Moy Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control(AEMPC) Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CIC-AEET)Nanjing University of Information Science&TechnologyNanjing210044China Department of Civil Engineering University of Wollongong in DubaiDubaiUnited Arab Emirates Department of Civil Engineering Xi'an Jiaotong Liverpool UniversitySuzhouJiangsuChina

In the last two decades,developments in the area of biomineralization has yielded promising results making it a potentially environmentally friendly technique for a wide range of applications in engineering and wastewater/heavy metal *** Induced Carbonate Precipitation(MICP)has led to numerous patented applications ranging from novel strains and nutrient sources for the precipitation of *** are being constantly published to optimize the process to become a promising,cost effective,ecofriendly approach when compared with the existing traditional remediation technologies which are implemented to solve multiple contamination/pollution *** metal pollution still poses a major threat towards compromising the *** removal of heavy metals is of high importance due to their recalcitrance and persistence in the *** that perspective,this paper reviews the current and most significant discoveries and applications of MICP towards the conversion of heavy metals into heavy metal carbonates and removal of calcium from contaminated media such as polluted *** is evident from the literature survey that although heavy metal carbonate research is very effective in removal,is still in its early stages but could serve as a solution if the microorganisms are stimulated directly in the heavy metal environment.

关键词： Biomineralization MICP Urease enzyme Heavy meal entrapment