检索结果-南通市图书馆

Solid-phase Microextraction with Benzoxy-calix[6]arene Fiber Coupled to Gas Chromatography for the Analysis of polycyclic aromatic hydrocarbons in Water

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2011年第2期27卷 198-202页

作者： YE Chang-wen ZHANG Xue-na HUANG Jiang-yan LI Xiu-juan PAN Si-yi College of Food Science ＆ Technology Huazhong Agricultural University Wuhan 430070 P. R. China

Headspace solid-phase microextraction（HS-SPME） with sol-gel calix[6]arene-containing fiber followed by gas chromatography with a flame ionization detector was used to examine the composition and distribution of seven polycyclic aromatic hydrocarbons（PAHs） in water. The novel SPME fiber exhibited higher extraction efficiency to PAHs compared with poly（dimethylsiloxane） and other calixarene-containing fibers. Extraction/retention mechanism based on the interactions between calixarenes and PAHs was discussed. Owing to the good selectivity and high extraction capability of this calixarene fiber, low detection limits were obtained in a range of 0.34―6.50 ng/L and the relative standard deviation values were ≤12.3% for all of the analytes. The linear ranges of the proposed method were five orders of magnitude for the tested compounds, with linear correlation coefficients（r） greater than 0.998. The method was applied to the determination of polycyclic aromatic hydrocarbons in nine water sources in Wuhan City, China. Standard addition method was selected for the quantification and the recovery values were in a satisfactory range. Total PAHs concentrations in the nine surface water samples were found to vary between undetectable and 8.840 μg/L with two- and three-ring PAHs predominating.

关键词： polycyclic aromatic hydrocarbon Solid-phase microextraction Calixarene Gas chromatography Water

Health risk assessments of polycyclic aromatic hydrocarbons and chlorinated/brominated polycyclic aromatic hydrocarbons in urban air particles in a haze frequent area in China

在线全文

学校读者我要写书评

暂无评论

Emerging Contaminants 2020年第1期6卷 172-178页

作者： Miwei Shi Rongzhi Zhang Yunxia Wang Yan Zhang Yuan Zhang Yanjie Zhang Institute of Geographical Science Hebei Academy of SciencesEngineering Technology Research Center of Geographic Information Development and Application of HebeiShijiazhuang050011China

The potential threats of polycyclic aromatic hydrocarbons(PAHs)and chlorinated/brominated PAHs(Cl/Br-PAHs)to human health from particulate matter in the urban ambient air were studied using human health risk *** risk to human health caused by exposure to PAHs was evaluated in Shijiazhuang,China,from January to December *** PAHs concentration range was 16.02e475.21 ng/m3 and the toxic equivalent was 13.605 ng/*** adults,the average carcinogenic risk caused by respiratory exposure was 5.163×10^-6 and the resulting loss of life expectancy was 32.10 *** human health risks of respiratory exposure to Cl/Br-PAHs in atmospheric samples from the Haidian District,Beijing,China,were evaluated from November 2017 to July *** concentration ranges for the Cl-and Br-PAHs were 60.38e482.17 pg/m3 and 1.32e25.35 pg/m3,*** average carcinogenic equivalent concentrations were 0.3274 pg/m3 and 0.0061 pg/m3 for the Cl-and Br-PAHs,*** adults the average carcinogenic risks caused by respiratory exposure were 1.243×10^-10 and 2.316×10^-12 for the Cl-and Br-PAHs,*** resulting loss of life expectancy values were 0.001 min(Cl-PAHs)and 0.00 min(Br-PAHs).The pollution concentrations and toxic equivalents of the Cl/Br-PAHs in Beijing and of the PAHs in Shijiazhuang both showed toxicity was high in the *** average carcinogenic risk for exposure of adults to PAHs in Shijiazhuang was low with certain potential *** concentration of Cl-PAHs in Beijing was higher than that of Br-PAHs,and the average carcinogenic risk for exposure of adults to Cl/Br-PAHs was very low with slight harm.

关键词： Particulate matter Persistent organic pollutant polycyclic aromatic hydrocarbon Chlorinated/brominated polycyclic aromatic hydrocarbon Health risk assessment

Cloud Point Extraction of polycyclic aromatic hydrocarbons in Aqueous Solution with Silicone Surfactants

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2007年第4期15卷 468-473页

作者：姚炳佳杨立胡琼 Shigendo Akita School of Chemistty and Chemical Technology ShanghaiJiao Tong University Shanghai 200240 China Nagoya Municipal industrial Research Institute Nagoya Japan

Cloud point extraction （CPE） processes with two silicone surfactants, Dow Coming DC-190 and DC-193, were studied as preconcentration and treatment for the water polluted by three trace polycyclic aromatic hydrocarbons （PAHs）： anthracene, phenanthrene and pyrene. For all cases, the volumes of surfactant-rich phase obtained by two silicone surfactants were very small, i.e. a lower water content in the surfactant-rich phase was obtained. For example, less than 3% of the initial solution was obtained in a 1% （by mass） surfactant solution, which was much smaller than that of TX-114 in the same surfactant concentration. And TX-114 is known as a high compact surfactant-rich phase among most nonionic surfactants, thus the comparison showed that an excellent enrichment was ensured in the analysis application by the CPE process with the silicone surfactants, and the lower water content obtained in the surfactant-rich phase is also important in the large scale water treatment. The influences of additives and phase separation methodology on the recovery of PAHs were discussed. Comparing with DC-193, DC-190 has a lower cloud point and a higher recovery （near 100%） of all the three PAHs in same surfactant concentration, which was required for application as a preconcentration process prior to HPLC system. However the DC-190 solution is hard to be phase separated only by heating, whereas DC-193 has a relative higher phase separating speed by heating, but a high cloud point （around 360K） limits its application. Due to the phase separation by heating is the only method of CPE suitable to the large scale water treatment, the mixtures of two silicone surfacrants solutions were investigated in this study. A solution containing 1% of mixed DC-190 and DC-193 （in the ratio of 90 ： 10） removed anthracene, phenanthrene and pyrene near 100% with a relative low cloud point and quick phase separating speed.

关键词： cloud point extraction silicone surfactant ultraviolet absorbance polycyclic aromatic hydrocarbon water treatment

Uptake of polycyclic aromatic hydrocarbons across Bacterial Membrane

在线全文

学校读者我要写书评

暂无评论

Advances in Microbiology 2020年第7期10卷 331-348页

作者： Shaomin Yan Guang Wu State Key Laboratory of Non-Food Biomass and Enzyme Technology National Engineering Research Center for Non-Food Biorefinery Guangxi Key Laboratory of Biorefinery Guangxi Academy of Sciences Nanning China

polycyclic aromatic hydrocarbons (PAHs) are important pollutants, whose biodegradation and bioremediation with microorganisms are the promising ways to clean environments and reduce their exposure to humans. Although ... 详细信息

Polycyclic aromatic hydrocarbons (PAHs) are important pollutants, whose biodegradation and bioremediation with microorganisms are the promising ways to clean environments and reduce their exposure to humans. Although the transportation of PAHs across bacterial membrane is the first step forwards their biodegradation, it receives less attention. In this mini-review, we explore which transport system for uptake of carbon sources can serve for uptake of PAHs in bacteria, and try to uncover some patterns in their transport mechanisms. Collectively, 1) the major carbohydrate transport system, PTS, is unlikely to take PAHs because PAHs lack a hydroxy group for phosphorylation but aromatic acids are good candidates;2) PAHs could probably go through H+ symporters, especially the low-molecular-weight PAHs, which are partially dissolvable in water;3) it is unlikely that PAHs can produce chemiosmotic ion gradients to go through uniporters;and 4) antiporters could serve as transporters to transport PAHs across bacterial membrane only after the metabolism of PAHs generates extra H+ inside cell. Accordingly, the basic mechanism for uptake of PAHs is whether they can donate H+ in order to generate an electrochemical proton gradient to go through symporters.

关键词： Bacteria polycyclic aromatic hydrocarbon Transport Mechanisms

Relationship between heavy metals and polycyclic aromatic hydrocarbons in the multi-phases of Nanhu Lake, China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Geochimica 2006年第S1期 201-201页

作者： Yu LI1, Xiaoli WANG1, Yuhua WU1, Mao YUAN1, Shuhai GUO2 1 Department of Environmental Science, College of Environment and Resources, Jilin University, Changchun 166226, China 2 Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China

FT-ICR mass spectrometry for molecular characterization of water-insoluble organic compounds in winter atmospheric fine particulate matters

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第1期34卷 51-60页

作者： Cuiping Ning Yuan Gao Haoran Yu Haijun Zhang Ningbo Geng Rong Cao Jiping Chen CAS Key Laboratory of Separation Sciences for Analytical Chemistry Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianLiaoning 116023China University of Chinese Academy of Sciences Beijing 100049China

Water-insoluble organic compounds(WIOCs)are an important fraction of atmospheric fine particulate matters(PM_(2.5)),which could affect the climate system and threaten human health *** this study,molecular characterization of WIOCs in PM_(2.5) were investigated by 15 T Fourier transform ion cyclotron resonance mass spectrometry(FT-ICR MS)with atmospheric pressure photoionization(APPI)source in positive ion mode.A total of 2573 and1875 molecular formulas were identified in WIOCs extracted by dichloromethane,which were collected in hazy and normal days,*** identified molecular formulas were further classified into four major subgroups,including CH,CHN,CHO and CHNO *** compounds predominated in WIOCs,accounting for more than 60%in both *** compounds(26.6%)and CH compounds(16.1%)were the second highest subgroups in WIOCs from the hazy days and normal days,*** relative abundance and number of nitro-substituted aromatic compounds were significantly higher in hazy days than in normal *** molecular composition of WIOCs was more complex in hazy days while more aromatic compounds were identified in normal days.

关键词： PM_(2.5) WIOCs FT-ICR MS Molecular characteristics polycyclic aromatic hydrocarbon

Photolysis of a mixture of anthracene and benzo[a] pyrene at ultra-trace levels in natural water with disinfection purposes

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第6期32卷 79-94页

作者： Ainhoa Rubio-Clemente Edwin Chica Gustavo A.Penuela Facultad de Ciencias de La Salud.Universidad Catolica de Murcia(UCAM) Murcia 30107Spain Grupo GDCON Facultad de IngenieriaSede de Investigaciones Universitarias(SIU)Universidad de Antioquia(UdeA)Medellín 050010Colombia Facultad de Ingenieria Tecnologico de Antioquia-Institucion Universitaria(TdeA)Medellín 050034Colombia Departamento de Ingenieria Mecanica Facultad de IngenieriaUniversidad de Antioquia(UdeA)Medellín 050010Colombia

The photodegradation of anthracene(AN)and benzo[a]pyrene(BaP),two priority polycyclic aromatic hydrocarbons(PAHs),was examined at ultra-trace levels in surface water to elucidate their behaviour under several irradiance values and types of *** emitting flux and the spectrum of the lamps were found to develop a crucial role in AN and BaP degradation since removal efficiencies of the target contaminants higher than 99%were found after 15 min of irradiation under an ultraviolet C(UVC)irradiance of 0.63 mW/cm^2,corresponding to a fluence of 560.25 mJ/cm^*** the other hand,although ultraviolet A(UVA)lamps exhibited a higher irradiance compared to that of UVC lamps,they were not efficient for degrading the target *** removal kinetic studies corroborated these findings,being the AN elimination rate in surface water higher than that in deionized water at optimal operating *** potential was also measured.A rapid microbial load inactivation,in terms of total coliforms naturally contained in the water matrix studied,was evidenced within 15 min of treatment for the fluence ***,after 24 hr in the dark,a regrowth was ***,photolysis products more toxic than the parent compounds were found,which were not removed even by extending the treatment *** this regard,it can be concluded that the individual action of UVC light for removing AN and BaP with disinfection purposes is not an efficient treatment;therefore,the use of radiation in combination with other kinds of treatments is required.

关键词： polycyclic aromatic hydrocarbon Photolysis Matrix constituent Intermediate product Disinfection Regrowth

Biodegradation of Benzo[a]pyrene by Arthrobacter oxydans B4

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2012年第4期22卷 554-561页

作者： PENG Hui YIN Hua DENG Jun YE Jin-Shao CHEN Shuo-Na HE Bao-Yan ZHANG Na Department of Environmental Engineering Jinan UniversityGuangzhou 510632(China) Key Laboratory of Water//Soil Toxic Pollutants Control and Bioremediation of Guangdong Higher Education Institutes Jinan UniversityGuangzhou 510632(China)

A bacterial strain, Arthrobacter oxydans （B4）, capable of degrading benzo[a]pyrene （BaP） in water body, was isolated from a polycyclic aromatic hydrocarbons-contaminated site. Effects of different factors, such as reaction time, pH value, temperature and organic nutrients, on BaP biodegradation by the strain B4 were studied. After 5 d treatment, the concentration of BaP in mineral salts medium was reduced to 0.318 mg L-1, compared to the initial concentration of 1.000 mg L-1. There was a process of acid formation during the degradation with pH falling from initial 7.01 to 4.61 at 5 d, so keeping the water body under slightly alkaline condition was propitious to BaP degradation. Strain B4 efficiently degraded BaP at 20 to 37 ~C with addition of organic nutrients. The biodegradation and transformation of BaP mainly occurred on cell surfaces, and extracellular secretions played an important role in these processes. Fourier transform infrared spectroscopy and gas chromatograph-mass spectrometer analyses of metabolites showed that ring cleavage occurred in the BaP degradation process and the resulting metabolically utilizable substrates were generated as sole carbon sources for B4 growth. Furthermore, mineralization extent of metabolites was verified by determining the total organic carbon and inorganic carbon in the degradation system.

关键词： degradation mechanism metabolites microbial transformation polycyclic aromatic hydrocarbon

Nonalternant isomer of pentacene fusing two azulene units

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第5期35卷 244-248页

作者： Bo Yu Pengchen Du Jianwen Guo Hanshen Xin Jianhua Zhang Department of Chemistry College of SciencesShanghai UniversityShanghai 200444China School of Microelectronics Shanghai UniversityShanghai 201800China

Azulene is a promising building block for creating innovative polycyclic aromatic hydrocarbons. This study involved the construction of three nonalternant isomers of pentacene by fusing two azulene units, named Az-PH1/2/3. Az-PH1 was initially developed through the rhodium(Ⅱ)-catalyzed cyclization of bis(N-tosylhydrazone)s. Intriguingly, Az-PH1 was also unexpectedly obtained during a nickel(0)-catalyzed one-step tandem reaction. We investigated the optical and electrochemical properties, aromaticity, and photo-oxidative stability of Az-PH1, comparing it with the well-known pentacene using density functional theory, electrochemical, and photophysical tests. Our results showed that the azulene-fusing strategy resulted in a molecule with narrow optical bandgaps(2.046 eV) and a long half-life time under ambient air conditions.

关键词： Azulene Isomer polycyclic aromatic hydrocarbon Nickel(0)-catalyzed Photo-oxidative stability