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尿中3种苯氧羧酸类除草剂的气相色谱分析法 总被引:3,自引:1,他引:3
本文研究了2,4-滴、2,4-滴丙酸和2甲4氯3种苯氧羧酸类除草剂用硫酸、三氯化硼、氯化氢和三氟乙酸等4种催化剂的甲醇、乙醇、丙醇、丁醇、戊醇、苯甲醇、三氟乙醇、五氟丙醇、二氯丙醇和五氟苯甲醇等10种醇的酯化衍生反应条件,在此基础上建立了尿中3种苯氧羧酸类除草剂的各种衍生化气相色谱电子俘获检测方法,其中较灵敏的方法2,4-滴和2,4-滴丙酸的检出限低于10 ng/mL,2甲4氯的检出限低于20ng/mL,适于职业接触者和中毒者的尿分析。 相似文献
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邻氨基苯酚化学修饰试剂用于气相色谱/质谱分析花粉脂肪酸 总被引:3,自引:0,他引:3
采用邻氨基苯酚作为脂肪酸的化学修饰试剂,将羧基修改为含氮杂环,使在EI源中避免链烯基中碳碳双键的移动。以气相色谱/EI质谱分析花粉脂肪酸,解析脂肪酸邻氨基苯酚化学修饰产物的EI质谱图;讨论了烯酸中碳碳双键的定位规则;鉴定出巨日花粉12种脂肪酸,由C12-C24脂肪酸组成,不饱和脂肪酸的含量占73.94%,其中多不饱和脂肪酸含量占47.61%,多不饱和脂肪酸与饱和脂肪酸之比达1.85,还检出了在其他花粉中极为少见的人体必需脂肪酸15-二十四烯酸(神经酸)。 相似文献
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Friedlnder反应是合成具有生物活性、光电活性的喹啉衍生物的重要方法.其典型转化之一——邻氨基芳香腈与羰基化合物的Friedlnder缩合在得到经典的转化产物的同时可以得到新骨架产物,这种新转化自本课题组报道以来已受到国内外学者的诸多关注,但该转化的新产物骨架结构尚存争议.本综述概括了该新转化自发现以来国内外的研究进展,从13C NMR,FT-IR,X射线单晶衍射数据等明确了新转化反应得到的产物骨架为喹唑啉酮结构.完整地提出了该类Friedlnder分岔反应的转化机理:经由分子内的Pinner反应到Dimroth重排的过程存在于邻氨基芳香腈和酮的经典Friedlnder反应中(PDF反应). 相似文献
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研究了在辛基苯基聚氧乙烯醚(OP)存在下,锌(Ⅱ)邻羟基苯基重氮氨基偶氮苯的显色反应,在pH 10.3的硼砂-氢氧化钠缓冲溶液中,锌(Ⅱ)与试剂形成1∶2的暗红色配合物,配合物的最大吸收峰位于530 nm波长处,表观摩尔吸光系数为1.65×105L.mol-1.cm-1。锌(Ⅱ)质量浓度在0~40μg/25 mL范围内符合比耳定律。方法用于铝合金、粮食、人发及水中微量锌的测定,结果的相对标准偏差小于3.2%,回收率在97.5%~105.0%之间。 相似文献
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国内气相色谱近年的进展 总被引:17,自引:0,他引:17
本文对近三年国内学者在气相色谱方面的研究和应用作了综述 ,国内学者的研究基本和国际上气相色谱方面的研究类似 ,在全二维气相色谱、快速气相色谱 ,微型气相色谱仪、新型气相色谱固定相和色谱柱的溶胶 凝胶涂渍技术领域的研究方面作出了贡献。有关气相色谱的应用研究中 ,介绍了大量在药物分析、食品分析、环境分析、石油和石化分析和化工产品及高聚物分析等领域中应用的题目和摘要 相似文献
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Summary Many important parameters of surface catalysed reactions can be determined simultaneously, under nonsteady state conditions using Reversed-Flow Gas Chromatography. A simple, slightly modified gas chromatograph is required. The distorted diffusion bands, obtained experimentally for reactant and product(s), can be analysed mathematically, using simple PC programs, to give the pre-exponential factors and the exponential coefficients of a function consisting of the sum of two-four exponential functions of time. From these, and some geometrical and diffusional characteristics of the reaction cell, the values of adsorption, desorption and reaction rate constants, the overall mass transfer coefficients in the gas and in the solid catalyst, and the adsorption equilibrium constant, for both reactant and product(s) can be calculated.The above parameters were determined at various temperatures and over three catalysts for the hydrodenitrogenation of piperidine ton-pentane, an industrially important hydrotreating process. The results obtained can help to understand the mechanism of reactions on solid surfaces and to confirm experimentally theoretical calculations on adsorption and surface reactions.Dedicated to Professor Leslie S. Ettre on the occasion of his 70th birthday. 相似文献
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Summary The efficiency of fast GC columns depends largely on the quality of the chromatograph. A theoretical and experimental study shows the relative importance of the various phenomena involved and permits the optimization of a GC System. Extremely good performances, exceeding 2,500 plates per second have been routinely obtained.Ezzel a tanulmánnyal Halász István Professzor Urat köszöntjük 60. születésnapja alkalmából. 相似文献
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A quantitative analysis method was established for detecting Ar, N2, CH4, CO and CO2 in fuel gas deuterium of fusion reactor by the INFICON 3000 micro gas chromatography. We studied the effects of column temperature, pressure and injection time to the analysis of the impurities in deuterium. The chromatographic conditions were optimized. The results indicated the retention time of all the impurities in D2 was less than 76. 0 s, the resolution of each component was larger than 1. 5 with the relative standard deviation (RSD) less than 1. 0%, and the detection limit of each component was less than 7. 0 μL / L. The method can quickly realize the separation and accurate quantitative analysis of the impurities in deuterium, and meet the analysis requirements of impurity in gas of deuterium and tritium fuel in fusion reactor. © 2021, Youke Publishing Co.,Ltd. All rights reserved. 相似文献