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芳香烃异构体的毛细管柱气相色谱—傅里叶变换红外光谱联用技术分析 总被引:1,自引:0,他引:1
采用国产色谱仪与进口红外光谱仪及接口组成的气相色谱-傅里叶变换红外光谱(GC/FTIR)分析仪,使用大口径毛细管柱,分析了乙苯与苯乙烯固相催化反应液的复杂芳香烃异构体组成,讨论了GC/FTIR分析中随机噪声和基线漂的去除方法。采用等高线图9CTD)分析技术得混合液中各组分的纯气相红外光谱图,最后了14个气相色谱峰中的9个,占整个色谱峰面积995以上。 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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单叶蔓荆子挥发油成分的GC/MS分析 总被引:4,自引:0,他引:4
采用气相色谱/质谱(GC/MS)联用技术对山东泰山产单叶蔓荆子挥发油的化学成分进行了分析,分离出30多个峰,确认了其中28种成分,占总离子流的95%以上,并对挥发油的主要化学成分Δ3-蒈烯,用气相色谱/傅里叶红外光谱(GC/FTIR)法进行了验证。 相似文献
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采用国产SC-7型色谱以及JP-01型居里点裂解器,Nicolet170SX红外光谱仪及接口组成的裂解色相色谱-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分析结果和媲美的 相似文献
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裂解毛细管柱气相色谱-傅里叶变换红外光谱的剖析应用 总被引:1,自引:0,他引:1
采用裂解气相色谱-傅里叶变换红外光谱(PyGC/FTIR)技术,使用大口径毛细管柱,分析了一未知进口涂料,对其主要裂解碎片峰进行了定性,进而从特征碎片的产生推出该涂料的成分。并同常规红外光谱差减法进行了比较,结果表明PyGC/FTIR具有简便、快速、全面和无需标样等优点,有广泛的应用价值。 相似文献
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采用裂解气相色谱-傅里叶变换红外光谱(PyGC/FTIR)技术,使用大口径毛细管柱,分析了一未知进口涂料,对其主要裂解碎片峰进行了定性,进而从特征碎片的产生推出该涂料的成分。并同常规红外光谱差减法进行了比较,结果表明PyGC/FTIR具有简便、快速、全面和无需标样等优点,有广泛的应用价值。 相似文献
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山苍子核仁油的大口径毛细管柱气相色谱—傅里叶变换红外光谱分析 总被引:5,自引:0,他引:5
本文采用国产色谱仪与进口红外光谱仪及接口加工组成气相色谱-傅里叶变换红外光谱分析仪,使用大口径弹性石英毛细管柱,分析了湖南省永顺县产山苍子核仁油的组成,讨论了利用等高线图分析技术及差谱技术处理GC-FTIR分析数据的方法,得出了其中约80多个组分的纯化合物气相红外光谱图,定性了其中38种物质,占总色谱峰面积的90%以上。 相似文献
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Previously Fourier transform infrared(FTIR) spectroscopy has been applied to detecting thyroid cancer during operations and to discriminating cervical metastatic ones from non-metastatic lymph nodes. This study explored the possibility of establishing a sensitive, accurate and noninvasive screen or diagnosis by preoperative FTIR spectroscopy. 111 patients undergone a thyroid operation and 50 healthy volunteers were enrolled in the study. The FTIR spectra were obtained by two mid-infrared optical fibers with an attenuated total reflectance(ATR) probe closely contacting the subjects' skin on the thyroid nodules. The FTIR spectra obtained from normal thyroid, nodular goiter(NG) and papillary thyroid carcinoma(PTC) patients were compared. A Fisher's discriminant analysis was created based on these data. There were 41 PTC patients and 70 NG patients according to their histopathological examinations. A total of 23(of 39) parameters were statistically different among the three groups(P<0.05). The F1300 and F1080 parameters were significantly different between the three groups. In total, 9 out of 39 FTIR parameters were selected as independent factors by the Wilks' lambda stepwise discriminant analysis. The discrimination accuracy of papillary thyroid carcinoma in the three groups was 88.8%. Surface detection of PTC by FTIR spectroscopy is feasible. FTIR spectroscopy can be used for rapid and noninvasive PTC screen and auxiliary diagnosis. 相似文献
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Osmani Q Hughes H Flavin K Hedin-Dahlstrom J Allender CJ Frisby J McLoughlin P 《Analytical and bioanalytical chemistry》2008,391(4):1229-1236
A detailed investigation into the functional groups responsible for the formation of a noncovalent complex between 2-aminopyridine
(template) and methacrylic acid (functional monomer) has been carried out using FTIR spectroscopy and confirmed by 1H NMR spectroscopic data. The approach adopted to confirm the mechanism of interaction was the analysis of the template plus
the structurally similar 2-methylaminopyridine and 2-dimethylaminopyridine. A 1:1 stoichiometry of complexation was determined
by Job plot analysis following titration, with FTIR results complementing those of the 1H NMR study. The strength of interaction between 2-aminopyridine and the functional monomer measured through band shifts by
FTIR spectroscopy was compared with such interactions for the isomers 3- and 4-aminopyridine. This comparison identified a
clear correlation between template pK
a, degree of interaction and subsequent nonspecific binding in the nonimprinted polymer. Using FTIR spectroscopy it was also
possible to observe the effect of temperature on the prepolymerisation solution. IR spectra showed that lower temperatures
led to more stabilized interactions of the hydrogen-bonded complex. The potential advantages of FTIR spectroscopy compared
with 1H NMR spectroscopy in studying prepolymerisation solutions have been identified. 相似文献
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S. L. Smith 《Journal of separation science》1985,8(8):385-387
A dual oven gas chromatograph incorporating a micro, mechanical switching valve has been interfaced to an FTIR spectrometer. With this system, each oven can be operated with independent temperature control. Complete choice of the columns' type and capacity gives flexibility in the separation prior to spectroscopic evaluation. An application which demonstrates some of the advantages of column switching in GC/FTIR is presented. Minor sample components have been successfully analyzed by heart-cutting the appropriate section of the separation from a high to a low capacity column. In this way, the dynamic range of the technique is effectively increased while an efficient chromatographic inlet to the FTIR is maintained. 相似文献
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Lao W Xu C Ji S You J Ou Q 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2000,56(11):2049-2060
The FTIR and FTR spectra of halogen (Cl, Br, I) substituted carbazole and their N-acetic and propionic acids have been recorded. A number of lines have been assigned on the basis of previous studies on the parent compound and by comparisons with the characteristic vibrations of their constituent structural units as well as comparing the spectra from FTIR and FTR. Some substituent-sensitive bands and characteristic bands were found. The electronic absorption spectra of these compounds in acetonitrile were also measured and are briefly discussed. 相似文献
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Photoinitiated substitution complex of [Fe(CN)6]4- with imidazole has been synthesized and characterized. On the basis of elemental analysis, the empirical molecular formula of the complex is K4[Fe(CN)5(C3H4N2)]·4H2O. The substitution of aquo ligand produced as a result of photoexcitation by imidazole has been confirmed by various spectroscopic thechniques like UV-Vis, FTIR, NMR, and SEM techniques. The characteristic FTIR and NMR ab- sorption peaks for different entities present support the assigned formul... 相似文献
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Haiting Zheng Daoben Hua Ruke Bai Keliang Hu Lijia An Caiyuan Pan 《Journal of polymer science. Part A, Polymer chemistry》2007,45(13):2609-2616
A new vinyl acyl azide monomer, 4‐(azidocarbonyl) phenyl methacrylate, has been synthesized and characterized by NMR and FTIR spectroscopy. The thermal stability of the new monomer has been investigated with FTIR and thermal gravimetry/differential thermal analysis (TG/DTA), and the monomer has been demonstrated to be stable below 50 °C in the solid state. The copolymerizations of the new monomer with methyl acrylate have been carried out at room temperature under 60Co γ‐ray irradiation in the presence of benzyl 1H‐imidazole‐1‐carbodithioate. The results show that the polymerizations bear all the characteristics of controlled/living free‐radical polymerizations, such as the molecular weight increasing linearly with the monomer conversion, the molecular weight distribution being narrow (<1.20), and a linear relationship existing between ln([M]0/[M]) and the polymerization time. The data from 1H NMR and FTIR confirm that no change in the acyl azide groups has occurred in the polymerization process and that acyl azide copolymers have been obtained. The thermal stability of the polymers has also been investigated with TG/DTA and FTIR. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 2609–2616, 2007 相似文献
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Zeolite 4A (LTA) has been successfully synthesized by a hydrothermal method, where kaolin was used as silica and alumina source. The synthesized zeolite was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), laser granulometry, and FTIR spectroscopy. XRD data from the Rietveld refinement method confirmed only one crystallographic phase. Zeolite A morphology was observed by SEM analysis, and it showed well-defined crystals with slightly different sizes but with the same cubic shape. Particle size distribution of the crystals was confirmed by laser granulometry, whereas FTIR spectroscopy revealed significant structural differences between the starting material and the final zeolite product used as water softener. 相似文献
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Juan Li Manoranjan Prusty Han Goossens Martin van Duin Gert de Wit 《Macromolecular Symposia》2005,230(1):59-66
The kinetics of the modification of styrene acrylonitrile (SAN) with aminoethanol to oxazoline-containing copolymers has been monitored with FTIR spectroscopy. Further, the interfacial reaction in bilayer samples of the oxazoline groups of these copolymers and the carboxylic acid groups of poly(ethylene-co-methacrylic acid) (PE-co-MA) copolymers has been studied by FTIR at different temperatures. The interfacial formation of ester-amides has been measured quantitatively by FTIR difference spectroscopy. 相似文献
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A new methodology for the determination of sucrose in complex aqueous matrices by flow injection analysis with FTIR detection is presented. The methodology based on the enzymatic hydrolytic cleavage of sucrose by means of invertase to -D-glucose and -D-fructose. A special manifold consisting of two internally coupled injection valves being switched simultaneously is applied to facilitate recording FTIR spectra of the sample before and after the enzymatic reaction. The analytical readout is taken from the resulting difference spectrum obtained by subtracting the FTIR spectra of the sample before and after the reaction. The developed methodology uses a GC-IR software to continuously record the FTIR spectra of the effluent from the manifold. The proposed method gives linear results in the range of 10 to 100 mmol/l and has been successfully applied to the analysis of sucrose in synthetic mixtures as well as in real samples such as soft drinks. 相似文献