气相色谱法分析低碳烷烃氧化脱氢芳构化产物

本文提供了一个简单有效的分析低碳烃氧化转化产物、包括Ｈ２、ＣＯｘ（ｘ＝１，２）和Ｃ１～Ｃ９烃的全组成分析方法，实验结果表明，该方法具有操作简单、定量结果准确性高、分析重复性好、以及连续运行周期长等特点，可满足课题基础研究的需要。     

毛细管气相色谱法测定液化石油气中C_1～C_5组分的方法研究

用毛细管气相色谱法测定液化石油气中C1～C5间13种烃类组分,使用Al2O3大口径毛细管柱,用纯组分混合物作标样,方法快速、灵敏,各组分相对标准偏差为0．39％～5．40％,乙烷、乙烯、丁烷及丁烯异构体得到基线分离。     

毛细管气相色谱法测定炼厂气中单体烃组分的含量

采用PLOT／Al2O3石英毛细管气相色谱柱和氢火焰离子化检测器，建立了炼厂气中单体烃组分含量测定的毛细管气相色谱法，当炼厂气中单体烃组分的含量大于或等于2．1％时，RSD≤0．95％，当炼厂气中单体烃组分的含量为0．5％－2．1％时，RSD为0．95％－10．0％，当炼厂气中单体烃组分的含量为0．2％－0．5％时，RSD为10．0％－25．0％，该方法对单体烃组分的测定结果与行业标准SH／T0230－92《液化石油气组成测定法》的测定结果基本一致。     

丙烯腈中杂质的分析

This paper describes an enective method for the analysis of organic impurities in acrylonitrile using mixedstationary phases.This method has the characteristics of good separation,satisfactory repeatability and shortanalysis time.     

二环己胺中微量苯胺等杂质的气相色谱与气-质联用分析

二环己胺可由苯胺催化加氢制得,故产物中有苯胺等杂质存在。苯胺等杂质对二环己胺产品质量有严重的影响,因此二环己胺纯度需达到99．5％以上,苯胺的含量应低于0．1％。本文以苯甲醇为内标,建立了二环己胺产品中微量苯胺的气相色谱分析条件,并且采用气相色谱一质谱(GCMS)分析了各杂质峰的归属,发现二环己胺产品纯度达不到     

酯交换法联产的1,2-丙二醇中微量杂质的气相色谱-质谱分析

1,2-丙二醇是重要的化工原料,具有优良的杀菌性、湿润性、溶剂性,广泛用作香料、食品、化妆品、医药等的溶剂、湿润剂或保存剂等。为了使以碳酸丙烯酯为中间体生产碳酸二甲酯的酯交换联产的工业级1,2-丙二醇达到医药级标准,需要对1,2-丙二醇进行精制加工处理,所以必须对其杂质进行鉴定分析。但目前国内外还未见对酯交换反应联产的1,2-丙二醇中杂质进行分析的报道     

汽油中气体组分含量的快速分析

采用美国HP6890炼厂气分析多维填充柱色谱仪,建立了汽油中气体组分含量快速分析方法。采用汽油直接进样,校正归一化法定量,测定汽油中CO2、H2S和各气体烃组分的含量,完成一个样品的分析仅需22min。实验表明,该方法有很好的精密度,各气体组分浓度值的相对标准偏差均小于4．5％。     

大气中C1～C10羰基化合物的分析测定

利用2,4二硝基苯肼(DNPH)涂布硅胶管采集空气中的C1～C10羰基化合物,经乙腈洗脱后用高效液相色谱-紫外检测器(HPLC/UV)分析检测.吸附管的采集效率>95%,平行样相对标准偏差<10%;化合物的检出限在0.05～0.15μg/m3之间,方法适合于室内和室外环境中低浓度的羰基化合物的测定.     

A Gas Chromatographic Analysis of Light Hydrocarbons on a Column Packed with Modified Silica Gel

IntroductionAnalysis of light hydrocarbons achieved by gas-solid chromatography is important in petrochemical industry, environmental protection and some other areas. A variety of columns have been used, including conventional packed column1, Al2O3 and graphitized carbon black PLOT column2, 3 and silica gel SCOT column4. Al2O3 PLOT column is excellent for the analysis of light hydrocarbons. Conventional packed column also has its own advantages, such as easy column preparation, resistanc…     

气相毛细管柱切割-反吹技术及归一化法分析汽油中的芳烃(英文)

 发展了一种采用毛细管气相柱切割 反吹技术分析汽油中芳烃的方法。利用强极性毛细管预柱将芳烃保留至n C10 的脂肪族化合物之后 ,并将其反吹到非极性毛细管柱中按沸点详细分离分析。该方法使预柱先流出的组分和分析柱流出的组分通过一个微型三通进入同一检测器中 ,因此可用归一化方法定量分析汽油中的芳烃。该方法可在 15min内完成汽油中苯至C10 芳烃的分析 ,结果的相对标准偏差 (RSD)≤ 3% ,切割误差为± 5s时分析结果的RSD≤ 4 %。     

微型反应器液相产物中C1～C5烃分析系统及方法研究

本介绍了一个适于终沸点为４００℃或更主的微型反应器液相产物中Ｃ１－Ｃ５烃全组成分析的专用分析系统和分析方法。系统由六通阀、预柱和分析柱组成，所有组件均置于同一色谱炉内，采用ＦＩＤ检测外标法定量。分析结果相对标准偏差小于１０％。半年来的应用结果表明，该系统及方法具有操作简便，定量结果准确，适用范围宽，连续运行周期长等特点，可以用于各类宽镏分样品中Ｃ１－Ｃ５烃的全组成分析。     

吸附/热脱附气相色谱分析痕量C1～C5烃

本文以活性炭、TDX-01、Tenax GC、Porapak Q和GDX-104为吸附剂，不经冷凝，在常温下吸附富集痕量C1～C5烃并直接引入毛细管柱。同时探讨了吸附剂的最佳热脱附温度、饱和吸附量、吸附富集回收率、热脱附直接进样的线性规律及方法的相对偏差．     

Analysis of Trace Levels of Volatile Organic Contaminants in Municipal Drinking Water by Glass Capillary Gas Chromatography Using Simultaneous Flame Ionization and Electron Capture Detection

Abstract

A glass capillary gas chromatographic system using simultaneous flame ionization (FID) and electron capture (ECD) detection has been employed for the analysis of trace volatile organic pollutants in a municipal drinking water supply. The use of dual detectors with glass capillary columns allows resolution and detection of both halogenated and non-halogenated compounds simultaneously at less than microgram per liter (ppb) concentrations. By using diethyl ether as a solvent in preparing standard solutions of volatile organic compounds, standardization is made more accurate due to a reduction in solvent masking of early eluting peaks of interest. Additionally, ether shows promise for use in an internal standard method for quantification of VOA. These techniques were found to alleviate problems previously encountered in the analysis of purgeable organics and are described.     

Identification and Differentiation of Isomeric Methylated Derivatives of Oxygenation Products of Polycyclic Aromatic Hydrocarbons by Gas Chromatography - Mass Spectrometry

Abstract

An isomeric pair of compounds is obtained from 4-car-boxyaldehydephenanthrene-5-carboxylic acid (1) by various methods routinely applied for the methylation of acidic oxygenation products of K-region polycyclic aromatic hydrocarbons (PAH's) prior to GC and GC/MS analysis. Differentiation of the individual cyclic and acyclic isomers, a classical general problem, proves possible by careful analysis of the mass spectral fragmentation patterns in the representative case studied here.     

1－己烯羰化制庚醛过程中的气相色谱法分析

用交联ＳＥ－５４ＳＣＯＴ玻璃毛细管柱分离了１－己烯羰化制庚醛过程的原料、产品及杂质，并采用气相色谱－质谱（ＧＣ－ＭＳ）技术和纯样对照法鉴定组分。与填充柱定量结果对比表明，毛细管气相色谱法简便、准确，具有实用价值。     

Solid-phase Microextraction with Benzoxy-calix[6]arene Fiber Coupled to Gas Chromatography for the Analysis of Polycyclic Aromatic Hydrocarbons in Water

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. ...     

The investigation and application of the packed glass capillary column with a core

A new type of packed glass capillary column (PGCC) with a core, and its potential usage in practice are described. The permeability of the column is considerably greater than that of conventional PGCC and its N/(P_i-P_o) value is also higher. This novel PGCC column has been successfully applied to the analysis of trace levels of ethyne, cyclopropane, propadiene, propyne, and other C₁? C₄ impurities in pure ethene, propene, 1,3-butadiene, and catalytic cracking gas samples as well as other petrochemical gases such as liquified petroleum gas.