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介质阻挡放电降解苯乙烯的研究 总被引:10,自引:0,他引:10
研究了介质阻挡放电(DBD)常压下降解流动态苯乙烯时,不同电压、流速、初始浓度及湿度下苯乙烯的降解情况.结果表明,DBD降解苯乙烯15~20min即可达稳定,产物主要为CO、CO2和H2O;电压4800V时有少量带苯环的气态及固态物质产生,且随电压的升高而减少,到7500V时红外光谱已无法检测到;高电压下放电可以取得90%左右的降解率,产生带苯环的气态物质和结焦物质较少.流速在1.5cm/s,浓度为3000mg/m3,相对湿度为20%左右时,降解效果最好. 相似文献
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Bottled water may not be safer, or healthier, than tap water. The present studies have proved that styrene and some other aromatic compounds leach continuously from polystyrene (PS) bottles used locally for packaging. Water sapmles in contact with PS were extracted by a preconcentration technique called as "purge and trap" and analysed by gas chromatograph-mass spectrometer (GC/MS). Eleven aromatic compounds were identified in these studies. Maximum concentration of styrene in PS bottles was 29.5 μg/L. Apart from styrene, ethyl benzene, toluene and benzene were also quantified but their concentrations were much less than WHO guide line values. All other compounds were in traces. Quality of plastic and storage time were the major factor in leaching of styrene. Concentration of styrene was increased to 69.53 μg/L after one-year storage. In Styrofoam and PS cups studies, hot water was found to be contaminated with styrene and other aromatic compounds. It was observed that temperature played a major role in the leaching of styrene monomer from Styrofoam cups. Paper cups were found to be safe for hot drinks. 相似文献
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Investigation of protein-styrene oxide adducts as a molecularbiomarker of human exposed to styrene 总被引:2,自引:0,他引:2
IntroductionBiomarker ,definedascellular,biochemicalormolecularalterationsthataremeasurableinbiologicalmedia ,suchashumantissues ,cells,orfluids ,havebeenusedbygenerationsofepidemiologistsintheirresearch .Molecularbiologyandlaboratorytechnologyhaveshownane… 相似文献
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废聚苯乙烯的化学回收方法 总被引:10,自引:0,他引:10
废聚乙烯(PS)转化为燃料油和化学品的化学回收方法,分为废PS单独裂解及废PS与其它废塑料混合裂解两种方式,分别阐述了两种回收方式的研究成果和工艺现状,并就存在的问题进行了讨论。 相似文献
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用增强灵敏度的~32P后标记法测定DNA-环氧苯乙烯加合物 总被引:3,自引:1,他引:3
DNA加合物是具有亲电性化学致癌物与DNA形成共价相联的化合物,是化学致癌物损伤DNA的主要形式,能够灵敏准确地分析DNA加合物的方法是研究DNA损伤 相似文献
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Matthew S. Bates Norbert Gonzalez-Flesca Ranjeet Sokhi Vincenzo Cocheo 《Environmental monitoring and assessment》2000,65(1-2):89-97
Assessment of population exposure to VOC in ambient atmospheres is receiving heightened interest as the adverse health effects of chronic exposure to certain of these compounds are identified. Active (pumped) and passive samplers are the most commonly used devices for this type of monitoring. It has been shown, however, that these devices, along with all other preconcentration techniques, are susceptible to ozone interference. It is demonstrated that this interference occurs even at low ozone concentrations and that it may result in the under-estimation of population exposure. A convenient and effective ozone scrubbing method is identified and successfully applied and validated for both active and passive samplers for a range of VOC. 相似文献
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用内部填充有陶粒的生物滴滤塔净化苯乙烯废气,考察了气体流量、液体喷淋量及氮源对苯乙烯废气净化效果的影响。,进口苯乙烯质量浓度为300~4500mg/m^3时,气体流量和进FI苯乙烯质量浓度对苯乙烯的去除率影响显著,当气体流量为0.3m^3/h时,苯乙烯去除率达87%以上。实验结果表明:在气体流量为0.9m^3/h时,液体喷淋量对苯乙烯废气的净化效果影响不明显;降低进口苯乙烯质量浓度和增大生物滴滤塔的有效传质面积,有利于苯乙烯的净化;用浓度为0.0017mol/L的NaNO3作氮源时苯乙烯的去除效果优于用NH4Cl作氮源时苯乙烯的去除效果。 相似文献