检索结果-南通市图书馆

Acta Geochimica 2016年第3期35卷 288-293页

作者： Yi Mei yingchen bai Liying Wang State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences State Environmental Protection Key Laboratory for Lake Pollution Control Research Center of Lake EnvironmentChinese Research Academy of Environmental Sciences

In order to better understand the compositional and structural complexity of dissolved organic matter(DOM) macromolecules and provide mechanistic information on the binding of hydrophobic organic contaminants(HOCs) to DOM, we fractionated large amounts of lake water into three hydrophobic DOM-fractions. The variation of the partitioning coef?cients(K_(DOC)) of pyrene at different p H levels was examined by ?orescence quenching titration. Results show that, relative to the more polar acidic DOM-fractions, the hydrophobic neutral fraction exhibits a higher sorption ability to pyrene. Generally, the sorption of pyrene to the three hydrophobic fractions is strongly pH-dependent. The K_(DOC) values of pyrene generally increase with decreasing p H levels, which is especially obvious in the sorption of pyrene to the fulvic acid fractions, suggesting that the binding is controlled by hydrophobic interactions. The mechanisms underlying the binding of pyrene to the hydrophobic fractions were also discussed. Our data are bene?cial to further understanding the binding of HOCs to DOM and how it has been affected,which may result in more accurate predictions of K_(DOC).

关键词：疏水性有机污染物溶解有机物 DOM 酸组分 pH值分离湖水绑定

Plasmonic silver/silver oxide nanoparticles anchored bismuth vanadate as a novel visible-light ternary photocatalyst for degrading pharmaceutical micropollutants

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第10期32卷 21-32页

作者： Shengyan Pu Zeng Yang Jing Tang Hui Ma Shengyang Xue yingchen bai State Key Laboratory o f Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdK 610059SichitcmChina State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China Department of Plant and Environmental Sciences Uniuersity of CopenhagenThorvaldsensvej 401871 FrederiksbergDenmark

The degradation of pharmaceutical micropollutants is an intensifying environmental problem and synthesis of efficient photocatalysts for this purpose is one of the foremost challenges ***,this study was conducted to develop novel plasmonic Ag/Ag2O/BiVO4 nanocomposite photocatalysts by simple precipitation and thermal decomposition methods,which could exhibit higher photocatalytic activity for mineralized pharmaceutical *** the different treatments,the best performance was observed for the Ag/Ag2O/BiVO4 nanocomposites (5 wt.%;10 min’s visible light irradiation)which exhibited 6.57 times higher photodegradation rate than the pure ***,the effects of different influencing factors on the photodegradation system of tetracycline hydrochloride (TC-HCl) were investigated and the feasibility for its practical application was explored through the specific light sources,water source and cycle *** mechanistic study demonstrated that the photogenerated holes (h^+),superoxide radicals (·O2^-)and hydroxyl radicals (·OH) participated in TC-HCl removal process,which is different from the pure BiVO4 reaction ***,the present work can provide a new approach for the formation of novel plasmonic photocatalysts with high photoactivity and can act as effective practical application for environmental remediation.

关键词： Ag/Ag_2O/BiVO_4 Tetracycline hydrochloride Photocatalytic degradation Pharmaceutical micropollutants

New insights on the enhanced non-hydroxyl radical contribution under copper promoted TiO_(2)/GO for the photodegradation of tetracycline hydrochloride

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2021年第2期33卷 99-109页

作者： Sijia Qian Shengyan Pu Ying Zhang Peng Wang yingchen bai Bo Lai State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Enuironmental SciencesBeijing 100012China State Key Laboratory of Hydraulics and Mountain River Engineering College of Architecture and EnuironmentSichuan Universitychengdu 610065China

TiO_(2)/graphene oxide(GO)as photocatalyst in the photo-degradation of multitudinous pollutants has been extensively *** its low photocatalytic efficiency is attributed to the high band gap energy which lead to low light ***-TiO_(2)/GO was synthesized via the impregnation methods to enhance the catalytic *** Cu-TiO_(2)/GO reaction rate constant for photo-degradation of pollutants(tetracycline hydrochloride,TC)was about 1.4 times that of TiO_(2)/*** 90 min,the removal ratio of Cu-TiO_(2)/GO for TC was 98%,and the maximum degradation ratio occurred at p H *** five cycles,the removal ratio of Cu-Ti O_(2)/GO still exceeded 98%.UV-visible adsorption spectra of Cu-Ti O_(2)/GO showed that its band gap was narrower than TiO_(2)/*** paramagnetic resonance(EPR)spectra test illustrated the generation rate of·O_(2)^(-)and·OH was higher in Cu-TiO_(2)/GO system than TiO_(2)/GO and TiO_(2) *** contribution sequence of oxidative species was·O_(2)^(-)>holes(h+)>·OH in both TiO_(2)/GO and Cu-Ti O_(2)/GO ***,the contribution of·OH in Cu-TiO_(2)/GO was less than that in TiO_(2)/GO during the photo-degradation *** phenomenon was attributed to the better adsorption performance of Cu-Ti O_(2)/GO which could reduce the accessibility of TC to·OH in *** enhanced non-hydroxyl radical contribution could be attributed to that the more other active species or sites on(nearby)the surface of Cu-TiO_(2)/GO generated after doping *** results provide a new perspective for the tradition metal-doped conventional catalysts to enhance the removal of organic pollutants in the environment.

关键词： Traditional metal doping TiO_(2) Graphene oxide Non–hydroxyl radical Tetracycline hydrochloride

Binding characteristics of perylene, phenanthrene and anthracene to different DOM fractions from lake water

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2009年第4期21卷 414-423页

作者： MEI Yi WU Fengchang WANG Liying bai yingchen LI Wen LIAO Haiqing State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China State Environmental Protection Key Laboratory for Lake Pollution Control Chinese Research Academy of Environmental Sciences Bering 100012 China

Six hydrophobic and hydrophilic fractions were isolated using XAD-8 and XAD-4 resins, and were extensively characterized. Partition coefficients of perylene, pbenanthrene and anthracene binding to the six fractions were determined by fluorescence quenching titration. The Kdo~ values obtained for the polycyclic aromatic hydrocarbons （PAHs） binding to the hydrophobic fractions were larger than those to the hydrophilic fractions. Nonlinear Stem-Volmer plots were observed when binding phenanthrene and anthracene to some hydrophilic fraction samples, suggesting saturation of polar interaction binding sites. A significant correlation of logKdo~ values with molecular weights and molar absorptivities at 280 nm was observed, while atomic ratio of C/t-I was found to be a poor indicator for aromaticity. Other structural descriptors such as paraffinic carbon and polarity influenced the DOM-fraction ability to bind PAHs. Different interaction mechanisms underlying binding of the different fractions to the PAHs were also discussed.

关键词： fluorescence quenching humic substances polycyclic aromatic hydrocarbons (PAHs) partition coefficient bindingcapacity

Simulated photo-degradation of dissolved organic matter in lakes revealed by three-dimensional excitation-emission matrix with regional integration and parallel factor analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第4期32卷 310-320页

作者： Jin Zhang Fanhao Song Tingting Li Kefu Xie Huiying Yao Baoshan Xing Zhongyu Li yingchen bai School of Environmental and Safety Engineering Changzhou UniversityJiangsu 213164China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China College of Water Sciences Beijing Normal UniversityBeijing 100875China Department of Chemistry Beijing Normal UniversityBeijing 100875China Stockbridge School of Agriculture University of MassachusettsAmherstMA01003USA

Simulated photo-degradation of fluorescent dissolved organic matter(FDOM) in Lake baihua(BH) and Lake Hongfeng(HF) was investigated with three-dimensional excitationemission matrix(3 DEEM) fluorescence combined with the fluorescence regional integration(FRI),parallel factor(PARAFAC) analysis,and multi-order kinetic *** the FRI analysis,fulvic-like and humic-like materials were the main constituents for both BH-FDOM and *** individual components were identified by use of PARAFAC analysis as humic-like components(C1),fulvic-like components(C2),protein-like components(C3) and unidentified components(C4).The maximum 3 DEEM fluorescence intensity of PARAFAC components C1-C3 decreased by about 60%,70% and 90%,respectively after *** multi-order kinetic model was acceptable to represent the photo-degradation of FDOM with correlation coefficient(Radj2)(0.963-0.998).The photo-degradation rate constants(kn) showed differences of three orders of magnitude,from 1.09 × 10-6 to 4.02 × 10-4 min-1,and half-life of multi-order model(T1/2n)ranged from 5.26 to 64.01 *** decreased values of fluorescence index(FI) and biogenic index(BI),the fact that of percent fluorescence response parameter of Region I(PⅠ,n) showed the greatest change ratio,followed by percent fluorescence response parameter of Region II(PⅡ,n,while the largest decrease ratio was found for C3 components,and the lowest T1/2n was observed for C3,indicated preferential degradation of protein-like materials/components derived from biological sources during *** research on the degradation of FDOM by 3 DEEM/FRI-PARAFAC would be beneficial to understanding the photo-degradation of FD OM in natural environments and accurately predicting the environmental behaviors of contaminants in the presence of FDOM.

关键词： Fluorescent dissolved organic matter Photo-degradation Fluorescence regional integration Parallel factor analysis Three-dimensional excitationemission matrix Multi-order kinetic models

Ultraviolet absorbance titration for the determination of conditional stability constants of Hg(Ⅱ) and dissolved organic matter

在线全文

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2008年第1期27卷 46-52页

作者： bai yingchen WU Fengchang WAN Guojing LIU Congqiang FU Pingqing LI Wen The State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Graduate School of Chinese Academy of Sciences Beijing 100039 China

Strong interaction between natural dissolved organic matter (DOM) and Hg(Ⅱ) may influence the trans- port, conversion, toxicity and bio-validity of mercury in the environment. In this paper ultraviolet (UV) absorbance titration was employed for the first time for the determination of the conditional stability constants of Hg(Ⅱ) and (DOM). With increasing Hg(Ⅱ) concentrations, the UV absorbance of fulvic acid, humic acid, and DOM in river increases progressively. By linear and non-linear model fitting, the conditional stability constants (lgK) of Hg(Ⅱ) and DOM were worked out to be 3.54?4.93 and 3.64?4.85, respectively. The results are consistent with those acquired by the typical fluorescence quenching titration method, with the maximum relative error of lgK being 2.6% and the average relative error being 0.2%. The UV absorbance titration method has the advantages of rapid determination, simple performance, and it will probably become a new approach to studying interactions between DOM and trace metallic ions.

关键词：紫外线稳定性汞有机物

Three decades of changes in water environment of a large freshwater Lake and its relationship with socio-economic indicators

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2019年第3期31卷 156-166页

作者： Cuicui Li Weiying Feng Fanhao Song Zhongqi He Fengchang Wu Yuanrong Zhu John P.Giesy yingchen bai Guangzhou Institute of Geochemistry Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences USDA-ARS Southern Regional Research Center Department of Biomedical Veterinary Sciences and Toxicology Centre University of Saskatchewan

Tai Lake(Ch: Taihu) has attracted international attention forcyanobacteria ***, the drivers of cultural eutrophication, especially long-term socio-economic indicators have been little researched. The results of research demonstrate how socioeconomic development affected quality of water and how it has been improved by anthropogenic activities. This study described variability in indicators of water quality in Tai Lakeand investigated thedrivers. Significant relationships existed between concentrations of annual mean total nitrogen(TN), total phosphorous(TP), chemical oxygen demand(COD) and biological oxygen demand(BOD), and population, per capital gross domestic production(GDP) and sewage discharge(p < 0.05). However, mechanisms causing change varied among TN, TP, COD and BOD. Before 2000, the main contributors to increases in concentrations of TN were human population, GDP and volumes of domestic sewage discharges. After 2000, discharges of industrial sewage become the primary contributor. After 1998, the regressions of annual mean TN, TP and COD on per capital GDP, population and domestic sewage discharge were reversed compared to the former period. Since 1999, an apparent inverted U-shaped relationship between environmental pollution and economic development has developed, which indicated that actions taken by governments have markedly improved quality of water in Tai Lake. The statistical relationship between BOD and per capital GDP didn't conform to the Kuznet curve. The Ushaped Kuznet curve may offer hope for the future that with significant environmental investments a high GDP can be reached and maintained without degradation of the environment, especially through appropriate management of industrial sewage discharge.

关键词： Eutrophic lake Water environment indicators Population GDP Sewage discharge Asia

A preliminary study on pollution characteristics of surfactant substances in fine particles in the Beibu Gulf Region of China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2021年第4期33卷 363-372页

作者： Zhengzheng Zhang Hong Li Hongyan Liu yingchen bai Jinjuan Li Guorui Zhi Yanting Yu Wenjun Li Hao Zhang Fan Meng National Center for Quality Supervision and Test of Building Engineering China Academy of Building ResearchBeijing 100013China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100021China College of Resource and Environmental Engineering Guizhou UniversityGuiyang 550025China Puyang Institute of Environmental Protection Science Puyang 457000China College of Geoscience and Surveying Engineering Chinese University of Mining&TechnologyBeijing 100083China School of Science Chinese University of GeosciencesBeijing 100083China

The pollution characteristics of surfactant substances in fine particles(PM_(2.5))in spring were studied in the Beibu Gulf Region of China,68 samples of PM_(2.5)were collected at Weizhou Island in Beihai City from March 12 to April 17,*** Anionic Surfactant Substances(ASS)and Cationic Surfactant Substances(CSS)in the samples were analyzed using Byethyl Violet Spectrophotometry and Disulfide Blue Spectrophotometry,*** with the data from backward trajectory simulation,the effects of air pollutants from remote transport on the pollution characteristics of surfactant substances in PM_(2.5)in the Beibu Gulf Region were analyzed and *** results showed that the daily mean concentrations of ASS and CSS in spring in the Beibu Gulf Region were 165.20 pmol/m^(3)and 8.05 pmol/m^(3),and the variation ranges were 23.21–452.55 pmol/m^(3)and 0.65–31.31 pmol/m^(3),accounting for 1.82‰±1.65‰and 0.12‰±0.11‰of the mass concentration of PM_(2.5),*** concentrations were lower than those in comparable regions around the *** was no clear correlation between the concentrations of ASS and CSS in PM_(2.5)and the mass concentrations of PM_(2.5).Tourism and air transport had a positive contribution on the concentrations of *** concentration of surfactant substances in PM_(2.5)was significantly impacted by wind speed and wind *** temperature,air pressure and precipitation had little effect on the concentrations of surfactant *** substances in PM_(2.5)significantly impacted *** also showed that the main sources of surfactant substances were from the southern China and Southeast Asia.

关键词： Fine particles Surfactant substances Pollution characteristics Impact factors Beibu gulf region of China

A review of atmospheric benzene homologues in China: Characterization, health risk assessment, source identification and countermeasures

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第9期32卷 225-239页

作者： Yuanyuan Ji Fuhong Gao Zhenhai Wu Lei Li Dandan Li Hao Zhang Yujie Zhang Jian Gao yingchen bai Hong Li College of Earth Sciences Jilin UniversityChangchun 130061China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China Academy of Environmental Planning and Design Co.LtdNanjing UniversityNanjing 210093China Department of Urban Construction Beijing City UniversityBeijing 100083China College of Environmental and Resource Sciences Zhejiang UniversityHangzhou 310058China

Benzene homologues are important chemical precursors to the formation of ground-level ozone and secondary organic aerosol(SOA) in the atmosphere,in addition,some toxic species are harmful to human *** countermeasures have been taken to fight air pollution since 2013,and total amount control of volatile organic compounds is being promoted in China at ***,it is important to understand the pollution situation and the control status of ambient benzene homologues in *** paper reviews research progress from published papers on pollution characteristics,atmospheric photochemical reactivity,health risk assessment and source identification of ambient benzene homologues in recent years in China,and also summarizes policies and countermeasures for the control of ambient benzene homologues and the relevant *** total ambient levels of benzene,toluene,ethylbenzene and xylenes(BTEX) shows a declining tendency from 2001 to 2016 in *** mass concentrations of BTEX are generally higher in southern regions than in northern regions,and they present vertical decreasing variation characteristics with increasing altitude within the height range of about 5500 *** has the highest ozone formation potential and SOA formation potential both in urban areas and background areas,while benzene poses an obvious carcinogenic risk to the exposed adult populations in urban *** identification of ambient benzene homologues suggested that local governments should adopt differentiated control strategies for ambient benzene *** recommendations are put forward for future research and policy-making on the control of ambient benzene homologues in China.

关键词： pollution ambient ozone

Water temperature governs organophosphate ester dynamics in the aquatic food chain of Poyang Lake

在线全文

学校读者我要写书评

暂无评论

Environmental Science and Ecotechnology 2024年第5期21卷 197-207页

作者： Zhenfei Yan Chenglian Feng Yiping Xu Jindong Wang Nannan Huang Xiaowei Jin Fengchang Wu yingchen bai State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing100012China College of Environment Hohai UniversityNanjing210098China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing100085China China National Environmental Monitoring Centre Beijing100012China

Organophosphate esters(OPEs)are increasingly recognized as pervasive environmental contaminants,primarily from their extensive application in flame retardants and *** their widespread presence,the intricacies of OPE bioaccumulation within aquatic ecosystems remain poorly understood,particularly the environmental determinants influencing their distribution and the bioaccumulation dynamics across aquatic food *** we show that water temperature plays a crucial role in modulating the dispersion of OPE in the aquatic environment of Poyang *** quantified OPE concentrations across various matrices,uncovering levels ranging from 0.198 to 912.622 ng L^(-1) in water,0.013e493.36 ng per g dry weight(dw)in sediment,0.026e41.92 ng per g wet weight(ww)in plankton,0.13e2100.72 ng per g dw in benthic invertebrates,and 0.31e3956.49 ng per g dw in wild fish,highlighting a pronounced bioaccumulation ***,the intestines emerged as the principal site for OPE absorption,displaying the highest concentrations among the seven tissues *** the various OPEs,tris(chloroethyl)phosphate was distinguished by its significant bioaccumulation potential within the aquatic food web,suggesting a need for heightened *** propensity for OPE accumulation was markedly higher in benthic invertebrates than wild fish,indicating a differential vulnerability within aquatic *** study lays a foundational basis for the risk assessment of OPEs as emerging contaminants and underscores the imperative to prioritize the examination of bioaccumulation effects,particularly in benthic invertebrates,to inform future environmental safeguarding strategies.

关键词： Organophosphate esters Driving factor Bioaccumulation and biomagnification Ecological risk