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

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

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Characterization of dissolved organic matter fractions from Lake Hongfeng, Southwestern China Plateau

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Journal of Environmental Sciences 2009年第5期21卷 581-588页

作者： WANG Liying WU Fengchang ZHANG Runyu 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 Research Center of Lake Eco-Environment Chinese Research Academy of Environmental Sciences Beifing 100012 China

With XAD-series and ion exchange resins, dissolved organic matter （DOM） from Lake Hongfeng in Southwestern China Plateau was isolated into 6 fractions, i.e., humic acid （HA）, fulvic acid （FA）, hydrophobic neutrals （HON）, hydrophilic acids （HIA）, hydrophilic bases （HIB） and hydrophilic neutrals （HIN）. Those fractions were characterized by high performance size exclusion chromatography, fluorescence spectroscopy and UV absorbance. Among the 6 fractions, FA was predominant and accounted for 51% of the total DOM. The weight-average （Mw） and number-averaged （Mn） molecular weight of these fractions ranged from 1688 to 2355 Da and from 1338 to 1928 Da, respectively. A strong correlation was observed between specific UV absorbance at 280 nm, E2/E3 （absorbance at 250 nm to 365 nm）, and the molecular weight for DOM fractions. UV-Vis fulvic-like fluorescence peaks were found in all fractions. Proteinlike fluorescence peaks existed in HON may indicate that microbial activity was severely in Lake Hongfeng. There was a significant relationship between fluorescence intensities and specific UV absorbance at 254 nm for those DOM fractions, suggesting their similar luminescence characteristics. The values of fluorescence index （f450/500） indicated that hydrophobic fractions may derive from terrestrial sources, and the hydrophilic fractions from microbial and terrestrial origins. Those results suggest that there were inter-relationships between molecular weight, fluorescence and absorbance characteristics, and also subtle consistencies between the hydrophilic and hydrophobic properties and the sources for these 6 fractions from Lake Hongfeng.

关键词： dissolved organic matter fractionation molecular weight UV absorbance fluorescence spectroscopy

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Study on dynamic dilution olfactometer based on the LabVIEW

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Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument 2010年第8 SUPPL.期31卷 78-81页

作者： Li, Changjian Liu, Weiling Zhao, Jie Ning, Xiaoyu Zou, Kehua Tianjin Academy of Environmental Sciences Tianjin 300191 China State Environmental Protection Key Laboratory of Odor Pollution Control Tianjin 300191 China School of Mechanical Engineering Hebei University of Technology Tianjin 300130 China

The aim of this work was to establish a Dynamic Dilution Olfactometer, basement of research was national standard GB/T14675-93 and European standard En13725, core process of gas pipeline was flow-mixing of the odor and the pure gas by many MFCs, and compiled automation control software based on the LabVIEW programming language, realized functions of automatic control test schedule and determination of odor. The results show that on the calibration experiment to the dynamic olfactometer by the different concentration CO tracing gas, instrumental instability average Id of all dilution step is 0.92%, instrumental accuracy average Ad is 7.2%, meet to and smaller than European standard Id5% and Ad20%.

关键词： Software testing

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Poly(vinylpyridine) adsorbent for the removal of SIPA from its aqueous solution

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Chinese Chemical Letters 2009年第5期20卷 604-607页

作者： Wei Hua Tao Ai Min Li Chao Long Hong Ming Qian State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Nanjing 210093 China State Environmental Protection Engineering Center for Organic Chemical Industrial Waste Water Disposal and Resources Reuse Jiangsu Engineering Research Center for Organic Pollution Control and Resources Reuse Nanjing 210046 China Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection Yancheng 224002 China

Poly（vinylpyridine） WH-225 resin was prepared and characterized. Compared with the commercial hypercrosslinked adsorbent NDA-100 and macroporous adsorbent XAD-4 resins, the newly synthesized poly（vinylpyridine） WH... 详细信息

关键词： Vinylpyridine resin 5-Sodiosulfoisophthalic acids （SIPA） Adsorption

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Factors influencing the photodegradation of Nnitrosodimethylamine in drinking water

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Frontiers of Environmental Science & Engineering 2009年第1期3卷 91-97页

作者： Bingbing XU Zhonglin CHEN Fei QI Jimin SHEN Fengchang WU State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090China State Environmental Protection Key Laboratory for Lake Pollution Control Chinese Research Academy of Environmental SciencesBeijing 100012China College of Environmental Science and Engineering Beijing Forestry UniversityBeijing 100083China

In order to provide basic data for practical application,photodegradation experiment of Nnitrosodimethylamine(NDMA)in aqueous solution was carried out with a low-pressure Hg *** of the initial concentration of NDMA,solution pH,dissolved oxygen,and the presence of humic acid on NDMA photodegradation were *** at various initial concentrations selected in this study was almost completely photodegraded by UV irradiation within 20 min,except that at 1.07 mmol/L,NDMA could be photodegraded almost completely in the acidic and neutral solutions,while the removal efficiency decreased remarkably in the alkaline *** oxygen enhanced the NDMA photodegradation,and the presence of humic acid inhibited the degradation of *** on the initial concentration of NDMA,NDMA photodegradation by UV obeyed the pseudo-first-order ***,nitrite,and nitrate were detected as the photodegradation products of NDMA.^(1)O_(2) was found to be the reactive oxygen species present in the NDMA photodegradation process by UV,based on the inhibiting experiments using tert-butanol and sodium azide.

关键词： N-nitrosodimethylamine(NDMA) ultraviolet irradiation degradation kinetic dimethylamine photodegradation product

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Secondary organic carbon quantification and source apportionment of PM_(10) in Kaifeng, China

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Journal of Environmental Sciences 2009年第10期21卷 1353-1362页

作者： WU Lin FENG Yinchang WU Jianhui ZHU Tan BI Xiaohui HAN Bo YANG Weihong YANG Zhiqiang State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control College of Environmental Science and Engineering Nankai University Tianjin 300071 China Kaifeng Environmental Monitoring Center Kaifeng 475000 China.

During 2005, the filter samples of ambient PM10 from five sites and the source samples of particulate matter were collected in Kaifeng, Henan Province of China. Nineteen elements, water-soluble ions, total carbon （TC） and organic carbon （OC） contained in samples were analyzed. Seven contributive source types were identified and their contributions to ambient PM10 were estimated by chemical mass balance （CMB） receptor model. Weak associations between the concentrations of organic carbon and element carbon （EC） were observed during the sampling periods, indicating that there was secondary organic aerosol pollution in the urban atmosphere. An indirect method of ＂OC/EC minimum ratio＂ was applied to estimate the concentration of secondary organic carbon （SOC）. The results showed that SOC contributed 26.2%, 32.4% and 18.0% of TC in spring, summer-fall and winter, respectively, and the annual average SOC concentration was 7.07 μg/m^3, accounting for 5.73% of the total mass in ambient PM10. The carbon species concentrations in ambient PM10 were recalculated by subtracting SOC concentrations from measured concentrations of TC and OC to increase the compatibility of source and receptor measurements for CMB model.

关键词： PM10 source apportionment secondary organic carbon chemical mass balance

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New research advancement in electrical engineering field of China-Reviews on special issue of Science in China Series E:Technological Sciences

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Chinese Science Bulletin 2009年第8期54卷 1285-1286页

作者： MEI ShengWei MA Jin State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing 100084 China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing 102206 China

Based on,but not limited to the research results of electrical engineering published in the special issue of Science in China Series E,June 2008,this essay gives a brief review on a wide range of state-of-art advancement in electrical engineering field of China,which includes power system modeling,analysis and control,risk assessments in power system,etc.

关键词：电气工程工程领域技术科学电力系统研究成果中国科学系统建模风险评估

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Characteristics of organic and elemental carbon in atmospheric fine particles in Tianjin,China

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Particuology 2009年第6期7卷 432-437页

作者： Weifang Li Zhipeng Bai State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control College of Environmental Science and Engineering. Nankai University Tianjin 300071 China Institute of New Energy Material Chemistry College of Chemistry Nankai University Tianjin China

PM2.5 samples were collected at urban, industrial and coastal sites in Tianjin during winter, spring and summer in 2007. Concentrations of elemental carbon （EC） and organic carbon （OC） were analyzed using the IMPROVE thermal-optical reflectance （TOR） method. Both OC and EC exhibited a clear seasonal pattern with higher concentrations observed in the winter than in the spring and summer, due to cooperative effect of changes in emission rates and seasonal meteorology. The concentrations of carbonaceous species were also influenced by the local factors at different sampling sites, ranking in the order of industrial〉 urban 〉 coastal during winter and spring. In the summer, the port emissions, enriched with EC, had a significant impact on carbonaceous aerosols at the coastal site. Total carbonaceous aerosol accounted for 40.0% in winter, 33.8% in spring and 31.4% in summer of PM2.5 mass. Good correlation （R = 0.84-0.93） between OC and EC indicated that they had common dominant sources of combustion such as coal burning and traffic emissions. The daily average OC/EC ratios ranged from 2.1 to 9.1, the elevated OC/EC ratios being found in the winter. The estimated secondary organic carbon （SOC） accounted for 46.9%, 35.3% and 40.2% of the total OC in the winter, spring and summer, respectively, indicating that SOC may be an important contributor to fine organic aerosol in Tianjin.

关键词： PM2.5 Organic carbon Elemental carbon Secondary organic carbon Tianjin

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Synthesis and application of a hydrophobic hypercrosslinked polymeric resin for removing VOCs from humid gas stream

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Chinese Chemical Letters 2009年第4期20卷 492-495页

作者： Peng Liu Chao Long Hong Ming Qian Ying Li Ai Min Li Quan Xing Zhang State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 China State Environmental Protection Engineering Center for Organic Chemical Industrial Waste Water Disposal and Resources Reuse Nanjing 210046 China Jiangsu Engineering Research Center for Organic Pollution Control and Resources Reuse Nanjing 210046 China

A hydrophobic hypercrosslinked polymeric resin LC-1 was prepared and characterized. The properties of LC-1 resin were compared with those of a commercial hypercrosstinked polymer NDA-201 resin. In addition, the dynamic adsorption of trichloroethylene （TCE） onto LC-1 under dry and humid conditions at 303 K was investigated, the result shows that LC-1 possesses high hydrophobic property and can remove TCE from gas stream without effect of high humidity efficiently.

关键词： Hypercrosslinked polymeric resin Hydrophobic property Adsorption

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Effects of extracellular polymer substances on aerobic granulation in sequencing batch reactors

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Journal of Harbin Institute of Technology(New Series) 2009年第1期16卷 145-148页

作者：王志平刘莉莉姚杰孙立欣蔡伟民 School of Municipal and Environmental Engineering Harbin Institute of Technology School of Environmental Science and Engineering Shanghai Jiao Tong University State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resources and Environmental EngineeringEast China University of Science and Technology

The effects of extracellular polymeric substances (EPS) on aerobic granulation in sequencing batch reactors (SBR) were investigated by evaluating the EPS content, and the relationship between EPS composition and surface properties of glucose-fed aerobic granules. The results show that aerobic granular sludge contains more EPS than seed sludge, and it is about 47 mg/gMLSS. Corresponding to the changes of EPS, the surface charge of microorganisms in granules increases from -0.732 to -0.845 meq/gMLSS, whereas the hydrophobicty changes significantly from 48.46% to 73.16%. It is obviously that changes of EPS in sludge alter the negative surface charge and hydrophobicity of microorganisms in granules, enhance the polymeric interaction and promote the aerobic granulation. Moreover, EPS can serve as carbon and energy reserves in granulation, thus the growth between the interior and exterior bacteria is balanced, and the integrality of granules is maintained. SEM observation of the granules exhibits that EPS in granules are ropy; by mixing with bacteria, compact matrix structure can be formed. The distribution of EPS in granules profiles the importance of EPS storage. It can be concluded that EPS play a crucial role in aerobic granulation.

关键词： extracellular polymeric substances aerobic granulation hydrophobicity surface charge

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