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1.
郭友嘉  戴亮  任清  杨兰萍 《色谱》1994,12(2):110-113
 本文采用吸附-热脱法作为头香成分的捕集和进样工具,并以气相色谱和气相色谱/质谱作为分析手段,对茉莉鲜花蕾的释香过程成分变化作跟踪测定,结果表明释香的各阶段组成分有明显的不同,为精油生产选择合理的投料时间提供科学依据。  相似文献   

2.
文玉秀  张汉邦  傅若农 《色谱》1998,16(2):137-139
 对集束毛细管气相色谱柱的色谱性能,如流速对柱效的影响、柱温对柱效的影响、柱容量等进行了考察,并将其对典型火炸药成分DNT,TNT的分离与常规毛细管气相色谱柱进行了比较。结果表明,集束毛细管气相色谱柱综合了填充柱与石英毛细管气相色谱柱之优点,弥补了二者的不足,是一种柱容量较大且分离效能好、可以在高载气流速下操作的新型气相色谱柱。  相似文献   

3.
甲氧滴涕原药成分的气相色谱和气相色谱-质谱分析   总被引:1,自引:0,他引:1  
本文用气相色谱(GC),气相色谱-质谱联用(GC-MS)测定了甲氧滴涕(DMDT)原药中有效成分的含量及11种成分的结构。GC法内标定量结果表明,产品甲氧滴涕原药中有效成份达90%以上。  相似文献   

4.
引种欧洲香型玫瑰精油化学成分研究   总被引:4,自引:0,他引:4  
用毛细管气相色谱/质谱联用技术和气相色谱Kovats指数双重定性方法,从保加利亚,法国,土耳其和摩洛哥四国引种的欧洲香型玫瑰的精油中分别鉴定出94个化合物,其主要赋香成分与原生产国家的十分接近。这一研究结果为首次报道并在中国扩大种欧洲香型玫瑰提供了科学依据。  相似文献   

5.
GC/MS法测定木香挥发油化学成分   总被引:5,自引:0,他引:5  
用气相色谱-质谱法对木香挥发油进行化学成分的分析。采用水蒸气馏法从木香中提取挥发油。试用不同类型的毛细管柱进行分析,找出最佳分析条件,用归一化法测定其含量,并用气相色谱-质谱法对化学成分进行鉴定。共鉴定了38个成分,占挥发油总成分的86%以上。方法稳定可靠。重现性好,适用于中药挥发油的化学成分分析。  相似文献   

6.
用气相色谱-质谱法对山东昆嵛山产油松节挥发油进行化学成分的分析。采用水蒸气蒸馏法从油松节中提取挥发油。采用不同类型的毛细管柱进行分析,找出最佳分析条件,用归一化法测定其含量,并用气相色谱-质谱法对化学成分进行鉴定。共鉴定了48个成分,占挥发油总成分的84%以上。结果表明,此方法稳定可靠,重现性好,适用于中药挥发油的化学成分分析。  相似文献   

7.
本文利用气相色谱—四温裂解气相色谱联用仪对一些混合物作定性分析,此方法可用来作气相色谱难分离物质的鉴定。  相似文献   

8.
杨泽东 《色谱》1991,9(4):228-232
 〕研究了实验条件对气相色谱-裂解气相色谱联用的定性参数的影响,由于组分的各裂解产物的相对保留值在多数实验条件改变时重现性良好,可作为实际定性的主要依据,而裂解产物的相对峰面积可作为定性的辅助依据。  相似文献   

9.
近年国内外毛细管气相色谱柱的进展和趋向   总被引:4,自引:1,他引:3  
报道了近两年毛细管气相色谱柱的发展和趋向. 气相色谱柱制柱工艺是一个成熟的技术, 所以在制柱工艺方面的研究不够活跃. 近年新研究的固定相集中在常温离子液体和各种环糊精的衍生物. 近几年GC毛细管色谱柱的研究和改进集中在色谱柱厂家进行, 并立即成为商品柱. 本文对近两年一些重要期刊上发表的气相色谱论文进行了总结, 发现气相色谱分析所用的色谱柱大都使用毛细管柱, 并趋向于使用商品GC毛细管柱, 所使用的商品色谱柱中, 使用最多的是以含5%苯基的聚甲基硅氧烷做固定相的色谱柱, 其次是以100%甲基的聚硅氧烷做固定相的色谱柱. 极性毛细管色谱柱主要使用PEG、 OV-17和OV-1701固定相.  相似文献   

10.
呋喃丹及其主要水解,代谢产物的检验   总被引:6,自引:0,他引:6  
呋喃丹毒性较强,在动物体内和碱性介质下均易分解,该文研究了呋喃丹及其主要水解产物呋喃酚的提取方法和薄层色谱、气相色谱、气相色谱-质谱的检测方法,均获满意结果。当中毒后难以检出呋喃丹原体时,可以检测其水解产物呋喃酚认定中毒。  相似文献   

11.
本文对非晶硅太阳能电池制造工艺过程所用的无机氢化物烷类气体硅烷、硼烷、磷烷、甲烷和氢及其混合气的配制与分析方法进行了研究,以微机控制配气、检测程序、气相色谱法分成分析杂质,电容法测水分,方法已应用于工艺过程分析。  相似文献   

12.
Abstract

For the analysis of metsulfuron-methyl in the crop soils with a sensitivity limit of 0.3 μg kg?1 dry soil, in the soil extract metsulfuron-methyl was separated from its soil metabolites and the soil impurities by repeated thin-layer chromatographies (TLC). In the cleaned soil extract, diazomethane transformed metsulfuron-methyl 1 into N,N′ -dimethyl metsulfuron-methyl 2 (methyl 2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)methylamino]carbonyl]methylamino]sulfonyl]benzoate). In the gas-liquid chromatograph with detection by electron capture (GC-EC) and in the combined gas chromatograph-mass spectrometer (GC-MS), 2 was transformed into 1-dioxy-2-N-methyl-3-keto-1,2-benzisothiazole 3 which was measured by GC-EC with confirmation by GC-MS. The metsulfuron-methyl soil metabolites 2-sulfonamido-methylbenzoate 6, 1-dioxy-3-keto-1,2-benzisothiazole (saccharin) 7 and 2-sulfonamidobenzoic acid 8 were analyzed in the soil of winter wheat crops by a procedure similar to the one for metsulfuron-methyl. After their separation and purification in the soil extracts by TLC, 7 and 8 were methylated, and analyzed as 3 in the GC-EC and GC-MS apparatus where the generated 6 was quantitatively transformed into 3; 6 was analyzed as such with the GC and GC-MS apparatus wherein it was transformed into 3. The sensitivity limit for each metabolite was 0.3 μg of equivalents of metsulfuron-methyl kg?1dry soil. The syntheses of the analysis standards of the metsulfuron-methyl derivatives 2 and 3, and of the metsulfuron-methyl metabolites 6, 7 and 8 are described. The transformation pathways of metsulfuron-methyl and of its derivatives are different from those of the pyridine-pyrimidine sulfonylurea herbicides flupyrsulfuron-methyl and rimsulfuron. The soil analysis of a sulfonylurea -by means of one of its transformation product- needs a previous study of the chemical reactivity of the sulfonylurea. This leads to the analysis procedures for the main soil metabolites of the sulfonylurea.  相似文献   

13.
气相色谱近年的发展   总被引:1,自引:0,他引:1  
傅若农 《色谱》2009,27(5):584-591
简要阐述了近几年气相色谱(GC)的发展和特点。GC是一个成熟的技术,广泛地应用于各个领域,近几年GC的发展除了继续研究新的固定相和高性能的毛细管色谱柱之外,主要在全二维气相色谱(GC×GC)、快速GC、便携式GC仪和微型GC仪几个方面。近几年新研究的GC固定相主要集中在常温离子液体和各种环糊精的衍生物。现在GC研究者趋向于使用商品化的GC毛细管柱,而商品化的GC毛细管柱应用最多的是以含5%苯基的聚甲基硅氧烷为固定相的色谱柱。GC×GC发展迅猛,特别是关于调制器的研究,已开发出十多种调制模式,并广泛地应用于各个领域。为了适应大量样品的分析和现场分析,研究和开发了多种快速GC方法和仪器以及便携式GC仪。为了仪器的小型化和专属性检测,μGC仪的研究也稳步地发展起来。  相似文献   

14.
A second-order non-linear partial different equation was derived to describe the dependence of carrier gas pressure in the column on the column distance and the time under temperature programmed conditions. This equation was solved numerically by the modified finite difference method for various column parameters. Constant inlet and outlet pressures were used as boundary conditions. The retention times calculated on assumption of a constant pressure profile along the column. Significant differences between retention times of corresponding solutes calculated by the two methods were found, especially when relatively long columns(L>50m) with small internal diameter(d<0.3mm)and high temperature program rates (r>5°/min)are used.  相似文献   

15.
Sol-gel capillary column for gas chromatography was prepared with Hydroxyl-Terminated β-cyan-ethyl methyl-Polysiloxane as stationary phase.On this column alkanes,aromatic compounds,amines,alcohols etc.were separated successfully,although the length of this column was only 2.5m.Experiments showed that the column-inertness was good and the unsymmetrical factor was 1.At high temperatures the stationary phase of the column showed excellent stability.Results showed that the relative standard deviation of the ret...  相似文献   

16.
Summary A gas chromatographic system with capillary columns (fused silica) for the analysis of radiolabelled compounds is described. The system presented is based on a dual column gas chromatograph equipped with column switching facllity and a variable splitter at the column outlet combined with a dead-volume free adapter for the radioactivity monitor for continous measurement of radioactivity in the column effluent. The first column works as a separation column and the second is roughly shortened and used as a feed to the mass detector. The adjustment of the split ratio is regulated by the inlet pressures for the carrier gas supplying both columns. For mass detection all conventional systems can be used. Detection of radioactivity by a gas proportional counter (system based on a combustion technique). Three flow modes can be adjusted: a) total column effluent to the mass detector or b) to the radioactivity monitor, and c) simultaneous flow (dependent on the chosen split ratio) to mass-and radioactivity detectors. The system was developed for use in clinical chemistry and tested with labelled and unlabelled steroids. The method for peak identification by means of relative retention times and methylene units was possible also for radioactive peaks when a heart cutting technique was used. The radio gas chromatographic system presented allows the development of radiochromatograms with the same peak characteristics as in conventional capillary gas chromatography.Presented at the 14th International Symposium on Chromatography London, September, 1982  相似文献   

17.
快速气相色谱研究   总被引:1,自引:0,他引:1  
近年来快速气相色谱(HSGC)技术备受关注。本文根据色谱理论和实际应用中的特点对其进行了系统的分类和评价,阐述了如何针对具体样品选择分析方法和通过调整仪器的配置、参数以及性能来实现特定的快速分析。最后提出了HSGC未来的发展趋势。  相似文献   

18.
Summary Hydrogenation degradation of hexane, 2-methylpentane, 2,2-dimethylbutane, trans 2-hexene, cyclohexane and benzene on a nickel catalyst was studied. The degradation products were separated in a capillary column with squalane and identified using the appropriate retention indices. The results obtained (the degree of conversion and the relative content of the individual products) are discussed in connection with the thermal degradation of these substances in an inert atmosphere.  相似文献   

19.
超临界CO_2萃取姜油的组成研究   总被引:33,自引:1,他引:33  
郭振德  张相年  张镜澄 《色谱》1995,13(3):156-160
 用超临界CO_2萃取法从冷冻干燥的姜中萃取出姜油。通过薄层色谱、柱色谱、气相色谱以及色谱。质谱联用等手段进行组成剖析,并与水汽蒸馏法获得的姜油进行一些比较。结果表明超临界CO_2萃取法不仅能获得姜中的挥发油组分,而且能同时获得各种姜辣素成分。此法萃取的姜油目前已鉴定出的组分有97个,占色谱峰总面积的93%左右。  相似文献   

20.
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。  相似文献   

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