共查询到20条相似文献,搜索用时 93 毫秒
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高效液相色谱-电喷雾银离子诱导电离飞行时间质谱定性分析高沸点多环芳烃 总被引:1,自引:0,他引:1
建立了高效液相色谱-电喷雾飞行时间质谱联用技术快速鉴别高沸点多环芳烃的方法。多环芳烃经色谱柱分离后,通过柱后添加AgNO3溶液诱导其在电喷雾离子源中电离,生成多环芳烃[M]+及其复合[M+Ag]+和[2M+Ag]+特征离子,根据所获得的各特征离子的精确分子量和分子式,可实现多环芳烃类化合物的快速鉴别。将本方法用于美国环保局(USEPA)规定的16种优先控制多环芳烃及原油中多环芳烃类化合物的分析鉴别,结果表明,四环以上的PAHs质谱信号良好,说明本方法适用于四环以上的高分子量、高沸点多环芳烃类化合物的分析鉴别。 相似文献
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分散固相萃取-气相色谱-串联质谱法测定蔬菜中多环芳烃及卤代多环芳烃 总被引:1,自引:0,他引:1
建立了同时检测蔬菜中16种多环芳烃(PAHs)和11种卤代多环芳烃(X-PAHs)污染水平的分散固相萃取-气相色谱-串联质谱(GC-MS/MS)分析方法。样品中的多环芳烃和卤代多环芳烃经正己烷提取,N-丙基乙二胺吸附剂(PSA)和十八烷基键合硅胶吸附剂(C18)分散固相萃取净化剂净化,气相色谱-串联质谱方法测定,外标法定量。16种PAHs和11种X-PAHs在50,100和200μg/kg添加浓度下的回收率为74.7%~115.1%,相对标准偏差为1.6%~15.3%,方法检出限为0.03~7.4μg/kg。 相似文献
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提出了全二维气相色谱-氢火焰离子化检测器(GC×GC-FID)定性定量分析柴油中多环芳烃的方法。利用全二维气相色谱-飞行时间质谱法(GC×GC-TOF MS)确定柴油芳烃的4个族组成,分别为非芳烃、一环芳烃、二环芳烃和三环+芳烃,获得37种定性化合物;采用峰面积归一化法对多环芳烃进行定量。结果表明:柴油质控样中多环芳烃测定值的相对误差绝对值不大于5.0%;对柴油样品进行回收试验,回收率为95.7%~104%,测定值的相对标准偏差(n=6)为1.7%~4.3%。方法用于7种实际柴油样品分析,并与NB/SH/T 0806-2022进行比对,结果显示两种方法测定值的相对误差绝对值均不大于5.0%。 相似文献
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采用全二维气相色谱-质谱联用仪(GC×GC-MS),通过优化程序升温和调制周期,建立了喷气燃料裂解产物中芳烃的定性定量分析方法。该方法对多环芳烃(PAH)同分异构体具有良好的分离能力。利用MS检测器谱库检索结果、芳烃标准品及相关的文献报道,对喷气燃料裂解产物中常见的单环芳烃、二环芳烃、三环芳烃及四环芳烃等共27种芳烃进行了准确定性,并利用外标GC×GC-FID法对其进行定量。定量结果表明,芳烃含量均随着裂解产气率的增加而增大,当裂解产气率达到22%时,二环芳烃开始产生,且其含量随着裂解产气率的增加呈指数形式增加。该方法与传统的气相色谱-质谱相比,具有更好的分离及定性能力,可应用于复杂样品的分离及其定性定量分析。 相似文献
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聚丙烯酸树脂涂层HS-SPME-GC-MS监测城市污水中的芳香烃化合物 总被引:2,自引:0,他引:2
采用聚丙烯酸树脂涂层-固相微萃取-气相色谱-质谱(PA—SPME—GC—MS)联用技术,在优化的萃取条件下检测了城市污水中的苯系物和多环芳烃等芳香烃化合物.该方法的最低检出限达12ng/L水平,相对标准偏差为1.7%~9.8%. 相似文献
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气相色谱质谱法测定化妆品中9种多环芳烃 总被引:1,自引:0,他引:1
建立了气相色谱质谱法测定化妆品中9种多环芳烃的分析方法。化妆品中的萘、苯并[a]蒽、、苯并[b]荧蒽、苯并[j]荧蒽、苯并[k]荧蒽、苯并[e]芘、苯并[a]芘、二苯并[a,h]蒽等9种多环芳烃用甲醇超声提取后,用环己烷液-液萃取后浓缩,经硅胶-中性氧化铝柱净化后,采用气相色谱-质谱测定。多环芳烃浓度在0.05~2 mg/L范围内,质量浓度与其峰面积呈良好的线性关系。在低、中、高3个添加水平下,9种多环芳烃化合物的平均回收率为81.6%~100.2%,相对标准偏差为1.3%~5.8%。方法可用于化妆品中多环芳烃的检测。 相似文献
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Suchhanda S. Swain Lakshmi Unnikrishnan Smita Mohanty Sanjay K. Nayak 《Surface and interface analysis : SIA》2023,55(1):10-25
Carbonaceous nanomaterials and their derivatives have been inspired tremendous enthusiasm in the scientific community. They have been excogitated as the encouraging attributes and the qualified dispersed phase to develop multi-functional composites. Particularly, graphene and carbon nanotube (anisotropic fillers) have gained substantial research interest owing to their promising characteristics. This highlights an innovative technique to synthesize hybridized nanotube and nanosheet. Initially, parent materials have been synthesized: The pristine CNT has been modified by acid mixture solution, and reduced graphene oxide has been prepared by chemical reduction method. Henceforth, the self-assembly in situ sol–gel technique has been endorsed here. The synthesized nanohybrids have been characterized by different spectroscopic techniques: FTIR, Raman, UV, and XPS to confirm the attachment of multifunctionalities; meanwhile, the composition and stability have been investigated from XRD and TGA plots. The magnitude of surface charge and particle size distribution have been evaluated for the parent and hybridized products; further, morphology of all the samples has been authenticated from FESEM and TEM. 相似文献
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Changes to the fundamental and analytical parameters of a plasma have been investigated when ethanol has been added to aqueous or organic solutions. Excitation temperature, electron number density, and intensity of the H(alpha) line increased when ethanol has been added to aqueous solutions, while an electron density decrease and signal reduction have been found when ethanol has been added to xylene. The sensitivity has been improved for all ethanol concentrations when water has been the solvent, but the reverse has been found for xylene solutions. 相似文献
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本文介绍FAB质谱的原理、功能和优点。综述了FAB机理,讨论了影响FAB谱的因素。归纳了FAB法在金属有机配合物研究中的应用。 相似文献
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Model matter agglomerations, with temperature as leading control parameter, have been considered, and some of their characteristics have been studied. The primary interest has been focused on the grain volume fluctuations, the magnitude of which readily differentiates between two commonly encountered types of matter agglomeration/aggregation processes, observed roughly for high- and low-density matter organizations. The two distinguished types of matter arrangements have been described through the (entropic) potential driving the system. The impact of the potential type on the character of matter agglomeration has been studied, preferentially for (low-density) matter aggregation for which a logarithmic measure of its speed has been proposed. A common matter diffusion as well as mechanical relaxation picture, emerging during the mature growing stage, has been drawn using a phenomenological line of argumentation. Applications, mostly towards obtaining soft agglomerates or so-called jammed materials, have been mentioned. 相似文献
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The surface disproportionation reaction mechanism of aluminum subchloride on the aluminum (100) surfaces has been investigated by the plane-wave density functional theory (DFT).Three kinds of possible reaction mechanism of AlCl disproportionation reaction on the aluminum (100)surfaces have been taken into account. The structures of reactants and products have been optimized, transition states have been confirmed and activation energies have been calculated. The adsorption energy of reactants and desorption energy of products have been determined. All of these have been employed to confirm the reaction mechanism and the rate determining step of AlCl disproportionation reaction on the aluminum (100) surfaces. 相似文献
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A.M. Costero M.J. Aurell M.J. Bañuls L.E. Ochando F.J. Tamarit A. Domenech 《Journal of inclusion phenomena and macrocyclic chemistry》2003,45(3-4):241-249
Several macrolactams containing in their structure biphenyl and pyridine moieties have been synthesized. The complexation ability of these compounds has been evaluated and the results have been explained considering the existence of intramolecular hydrogen bonds. Conformational studies have been developed in some cases. Single-crystal X-ray diffraction studies have been carried out with one of the ligands. The electrochemical response of ligands 1 and 3 has been studied using cyclic and square wave voltammetry. The interaction of these ligands with Cu2+ ions in CH3CN has been investigated by electrochemical techniques. 相似文献
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Pt/HM、Pd/HM催化剂上CO氧化反应活性和动力学研究 总被引:1,自引:0,他引:1
研究了Pt/HM、Pd/HM催化剂上CO氧化反应的活性,求出了各种催化剂的CO氧化反应动力学方程。考察了不同气氛下CO氧化活性的演变规律和V4+、Co2+离子对Pt、Pd的助催化作用,并用催化剂集团结构适应模型对以上结果作出了解释。 相似文献
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ClO与ClO自由基反应机理及电子密度拓扑分析 总被引:1,自引:0,他引:1
利用密度泛函理论对ClO与ClO自由基反应机理进行了深入理论探讨,在B3LYP/6-311++G(3df)水平上对该反应体系的反应物、中间体、过渡态及产物进行了几何构型优化,对反应通道进行了IRC(内禀反应坐标)路径解析,计算了沿各反应通道的能垒和离解能,并进行了零点能校正.从量子拓扑学的角度,对反应通道IRC途径上一些重要点进行了电子密度拓扑分析,讨论了反应过程中化学键的断裂、生成以及键的变化规律,找到了反应途径的能量过渡态和结构过渡态. 相似文献
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Determination of antioxidant migration levels from low-density polyethylene films into food simulants 总被引:5,自引:0,他引:5
Dopico-García MS López-Vilariño JM González-Rodríguez MV 《Journal of chromatography. A》2003,1018(1):53-62
An analytical method for the determination of specific migration levels of phenolic antioxidants from low-density polyethylene (LDPE) into food simulant has been developed. The screening and response surface experimental designs to optimize the liquid-liquid extraction (LLE) of these antioxidants have been tested and the analyses have been carried out by reversed-phase high-performance liquid chromatography (HPLC) coupled with ultraviolet diode-array detector. The procedure developed has been applied to specific migration tests in different commercial LDPE films. The considered antioxidants have not been found upper the legislation limits although Ethanox 330 and Irgafos 168 have been found at trace level. 相似文献