共查询到19条相似文献,搜索用时 109 毫秒
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用毛细管GC/MS和GC/FTIR研究挥发油的化学成分 总被引:3,自引:0,他引:3
本文用毛细管GC/MS和GC/FTIR对异叶青兰和鼠曲草两种植物挥发油的化学成分进行了研究,讨论了两种方法分析挥发油化学成分的优点和局限性。 相似文献
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采用毛细管气相色谱法(GC)测定了二乙基二硫的含量.结果表明,二乙基二硫含量在0.010.4g/L范围内具有良好的线性关系,平均回收率为99.91%;该方法简便、准确、重复性好,可方便地用于二乙基二硫含量的测定. 相似文献
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快速气相色谱法分析石油饱和烃 总被引:6,自引:0,他引:6
提出了一种快速分析原油和岩石抽提物中饱和烃组分的毛细管气相色谱(GC)方法。由于在该方法中采用了细内径毛细管柱,故饱和烃的GC分析周期由原来的80~90 min缩短至15 min,分析速度加快约5倍,大大提高了工作效率和仪器通量,使石油饱和烃得到了很好的分离分析。该方法符合中华人民共和国石油天然气行业标准SY/T5120-1997的要求。20万理论塔板数的细径柱的应用,可供石油中异构烷烃,尤其是甾烷、萜烷类的气相色谱/质谱(GC/MS)快速分析方法及芳烃的GC快速分析方法借鉴。 相似文献
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色谱与色谱/质谱法相结合分析热裂解汽油C9馏分 总被引:3,自引:0,他引:3
采用毛细管气相色谱-氢火焰离子化检测器(CGC-FID)和气相色谱-质谱法(GC/MS)分析了热裂解汽油C9 馏分的组成。实验使用PONA毛细管气相色谱柱(100 m×0.25 mm i.d.×0.5 μm),根据烃类化合物在PONA柱上的保留规律,以正构烷烃标样保留值作为碳数分布依据,定量分析了裂解汽油C9 馏分中烃类化合物的碳数分布和单体烃含量;用GC/MS联用技术和CGC保留值定性法相结合对裂解汽油C9 馏分中相对含量大于0.2%的39种化合物进行了定性。 相似文献
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用气相层析法从天然产物中分离纯化(微克级)生物活性物质是一种简便而有效的方法。然而在气相层析制备时,则由于用作密封玻璃柱的硅橡胶垫圈有分解现象,往往引起GC本底的明显增高,产生了误差。我们改用柔性石墨作为密封玻璃柱的垫圈后,GC本底显著降低,为制备较纯样品创造了条件。微量制备气相层析仪由上分102型改装。9.2%OV-1(二甲基硅酮)涂于Gas Chrom Q 80~100目;柱温:180℃;氮气流量:60毫升/分;用馏份收集管(长30厘米,ф2.0×0.5毫米的玻璃毛细管)收集15分钟,然后用10微升重蒸过的A.R四氯化碳冲洗下来,在Perkin~Elmer 580B红外分光光度计上测定。用硅橡胶垫圈及柔性石墨垫圈时,产生流出物的IR图如下: 相似文献
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变径毛细管柱GC/FTIR联用技术的研究 总被引:1,自引:0,他引:1
本文介绍了使用新型变径毛细管柱的气相色谱/傅里叶变换红外光谱联用技术(GC/FTIR)。以正构烷烃的混合物为样品,研究了载气速流、色谱进样量及柱后死体积对联用效果的影响。分别在变径毛细管柱GC/FTIR和普通毛细管柱GC/FTIR联用系统上分析了烷烃芳烃混合物和合成汽油样品,并利用软件系统提供的程序和红外标准谱库对所得光谱进行了检索。实验结果表明,变径毛细管柱GC/FTIR系统具有色谱进样量大,可鉴定组分多,分离能力强和检测灵敏度高等显著优点。 相似文献
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Compositional studies of high-temperature coal tar by GC/FTIR analysis of light oil fractions 总被引:1,自引:0,他引:1
Summary A method for determination of the composition of the light oil fractions in high-temperature coal tar by means of distillation, followed by gas chromatography on a crosslinked fused-silica, capillary column coated with optimum amount of stationary phase and identification by capillary gas chromatography/Fourier transform infrared spectrometry combined with GC retention indices (GC/FTIR-RI) is described. This method was effectively used to identify complex mixture such as coal tar without any standard samples, especially, adapted for isomeric compounds. More than 60 and 50 compounds were also separated and identified respectively in light oil fractions. This shows the capability of the capillary GC/FTIR combined with GC retention indices to identify isomers not accomplished by GC/MS. 相似文献
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香芸火绒草精油化学成分研究 总被引:6,自引:0,他引:6
用毛细管气相色谱/质谱、毛细管气相色谱/付里叶红外联用技术对青海产香芸火绒草精油化学成分进行分离。共鉴定出119个化俣物,占全部峰面积的96.8%。 相似文献
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Reference infrared vapour phase spectra of 20 polychlorobiphenyls (PCBs) have been obtained by gas chromatography/Fourier transform infrared spectroscopy (GC/FTIR). These spectra are consistent with those of PCB obtained by diffuse reflectance IR spectroscopy (DRIFT) and with those of more simple molecular structures (iodochlorobenzenes, 1-bromodichlorobenzenes). The IR frequencies of the GC/FTIR spectra of PCB are assigned in terms of substitution patterns. This work shows that GC/FTIR can be a good approach for differentiation and identification of PCB in complex mixtures. 相似文献
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采用国产SC-7型色谱仪及JP-01型居里点裂解器、Nicolet170SX红外光谱仪及接口组成的裂解气相色谱-傅里叶变换红外光谱(PGC/FTIR)分析仪、HP-17型大口径毛细管色谱柱,分析了两个复杂组成的聚合物样品。从主要裂解碎片峰的定性结果及形成机理出发,逐步推出了原样品的组成和结构。常规红外光谱分析方法被用来作为对比,但它获得的信息有限,无法得到能与PWBCGC/FTIR分析结果相媲美的结论,充分显示了PWBCGC/FTIR用于聚合物分析的优越性。 相似文献
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鱼油中二十碳五烯酸和二十二碳六烯酸的气相色谱—红外光谱分析 总被引:3,自引:1,他引:3
本文利用气相色谱-红外光谱联用仪对鱼油中的EPA和DHA进行了定性,定量的分析研究,建立了EPA-E和DHA-E的蒸气相红外标准谱图和气相色谱保留时间数据库,提供了一种在无法找到标准物质的情况下鱼油中EPA和DHA进行定性,定量分析的简便准硼确的方法。 相似文献
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The triazinone herbicides metamitron and metribuzin are degraded by desamination. After a derivatization step with ethereal diazomethane solution, different structures of the metabolites were determined by GC/MS. The assumption that this is based on a ketoenol-tautomery was confirmed by GC/FTIR and 1H-NMR spectroscopy. This fact has to be considered for carrying out definite metabolite identification. 相似文献
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The objective of this work was to evaluate the use of composite mass spectral (CMS) data from pyrolysis gas chromatography/mass spectrometry (PY–GC/MS) for lignocellulosic materials. Various forages, by-products and fiber fractions derived from them were examined as CMS by PY–GC/MS. The PY–GC/MS system consisted of a heated platinum filament, a capillary gas chromatograph and an ion trap detector (ITD) mass spectrometer operated under electron impact conditions. Mass spectra were then composited in several ways by summing all the mass spectra acquired within retention times corresponding to major product classes. CMS data were entered in a dedicated library and compared using the ITD library editor software. The usefulness of such a simple procedure for studies related to lignocellulose analysis, such as forage recognition, development of analytical methods and digestibility/maturity correlation, is discussed. 相似文献
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Chemical differences of the extractives revealed by FTIR methods can be further confirmed by 1H NMR and 13C NMR. Meanwhile, the volatile compounds in the extractives can be identified by GC/MS 相似文献