共查询到20条相似文献,搜索用时 125 毫秒
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激光诱导时间分辨光谱技术研究胶束体系中荧蒽的室温Ling光行为 总被引:10,自引:0,他引:10
在胶体系中磷光衰减符合一级指数衰减公式Pt=P0e^-t/r,作者以激光诱导时间分辨光谱技术测量了SDS胶束中荧蒽的磷光寿命和瞬时磷光强度PO值。 相似文献
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磷光寿命的研究及生物体内色氨酸的测定 总被引:3,自引:0,他引:3
研究了磷光寿命的特性及pH、溶剂极性、碘、铅、钡、铊等重原子对磷光寿命的影响。应用磷光寿命变化法,分析生物样品中色氨酸含量。小鼠体内,血、脑、心、肺、肝、脾、肾中游离色氨酸分别为8.9μg/mL,17.3,51.8,29.1,29.9,46,68.8μg/g。其中,组织血脑中色氨酸含量与文献报道一致。 相似文献
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在室温和微量环己烷存在下,β-环糊精能诱导溴代菲产生出强烈的磷光发射。微量的苏丹Ⅲ能显著猝灭溴代菲的室温磷光。利用液滴磷光传感技术考察了苏丹Ⅲ的浓度与反应体系磷光强度之间的关系,并对试验条件进行了优化,提出了液滴化学传感室温磷光法测定微量苏丹Ⅲ的方法。试验结果显示测定苏丹Ⅲ的线性范围为2.0×10-7~6.0×10-5mol.L-1。方法的检出限(3S/N)为0.1 mg.L-1。 相似文献
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Methods for the isolation and/or concentration of volatile organic compounds from water samples for trace organic analysis by gas chromatography are reviewed. The following basic groups of methods are discussed: liquid-liquid extraction, adsorption on solid sorbents, extraction with gas (gas stripping and static and dynamic headspace techniques) and membrane processes. The theoretical bases of these methods are discussed. Experimental arrangements for the isolation and/or concentration of volatile compounds from water are presented and discussed with respect to their efficiency. The applicability of the described methods to the isolation and/or concentration of various organic compounds from waters of various origins is discussed. 相似文献
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Bismaleimide resin (Compimide 353) was modified with the liquid elastomer carboxyl-terminated acrylonitrile butadiene (CTBN). The prereaction synthesis and curing of the CTBN-bismaleimide resin is discussed. The structure of the modified resin was identified by IR and NMR spectroscopy. The basic curing mechanism is also discussed. DSC and TG were used to study the curing behaviour and kinetic parameters, viz. the order of reaction, energy of activation and preexponential factor. Adhesive properties such as lap shear strength and peel strength at room temperature and elevated temperature were evaluated and are discussed. 相似文献
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The enthalpy of oxidative cleavage of azo compounds (diazenes) is discussed and compared with that of symmetric olefins. The
roles of substituents and of electronegativity are explicitly discussed. 相似文献
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色质联用仪真空系统维护经验点滴 总被引:3,自引:0,他引:3
向同寿 《分析测试技术与仪器》2001,7(4):252-253
叙述了大型精密色质联用仪高真空系统在日常工作中的维护和维修以及出现的部分故障与排除方法。 相似文献
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超声催化反应的研究现状和发展趋势 总被引:25,自引:0,他引:25
综述了近几十年来超声在催化反应领域中的研究成果,包括超声在均相和多相催化反应中的应用,探讨了超声在催化反应领域中的发展趋势。 相似文献
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钼、钨系过氧化物是非常重要的Sharpless烯烃环氧化催化剂,有着非常广泛的工业发展前景。本文综述了钼、钨系过氧化物的种类,结构,合成方法及催化活性,分析了各种钼、钨系过氧化物的特点以及在催化环氧化领域的发展现状。同时,本文还讨论了钼、钨系过氧化物催化烯烃环氧化反应的机理。评述了在催化环氧化领域中两种主要理论——Mimoun机理与Sharpless机理的争论焦点及发展现状,以及计算化学对两种理论中间过渡态的研究进展,并且重点分析了Sharpless机理的过渡态结构。此外,本文还综述了影响钼、钨系过氧化物催化剂反应活性的各种因素以及质子所产生的副反应。最后,本文对应用于催化环氧化领域的钼、钨系过氧化物未来的研究方向提出了建议。 相似文献
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《Journal of Coordination Chemistry》2012,65(13):2264-2289
Schiff bases are aldehyde or ketone like compounds in which the carbonyl group is replaced by imine or azomethine group. They are widely used for industrial purposes and also exhibit a broad range as extractants. A general view of solvent extraction applications of complexes is discussed in this review. The family of Schiff bases and their extraction of various transition metals such as Co, Cu, Cr, Fe, Ga, Hg, Mn, Mo and Ni are discussed. A brief history of the synthesis and reactivity of Schiff bases will be presented. Factors on solvent extraction will be illustrated and discussed. 相似文献
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Katsuyoshi Nishinari BoSook Kim Yapeng Fang Yoko Nitta Makoto Takemasa 《Cellulose (London, England)》2006,13(4):365-374
Interaction between tamarind seed xyloglucan and the other polysaccharides, gellan gum or xanthan investigated by rheology, differential scanning calorimetry, and related methods was discussed. All these three polysaccharides do not form a gel at lower concentrations by itself at the experimental conditions studied but the gelation of xyloglucan occurs in the presence of gellan or xanthan. Gelation of xyloglucan in the presence of a polyphenol, epigallocatechin gallate, is also discussed. Hence the gelation of these mixtures is caused by the synergistic interaction, and the models for the synergistic interaction were discussed. The gelation of polysaccharides by the synergistic interaction is of great value for food and related industries. 相似文献
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Arnold Venema 《Journal of separation science》1990,13(8):537-539
The scope of the headspace sampling technique for the analysis of solid samples is discussed, and the static and the dynamic headspace methods compared. Theoretical aspects relating to quantification are discussed. The paper considers both instrumental requirements and applications. 相似文献
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李小莉 《中国无机分析化学》2013,3(1)
本文详细论述了压片法及熔融片法测定钼精矿的分析条件。其中压片法通过大量采用同一矿区的生产样品经化学定值后作为校准样品建立校准曲线,因此粒度效应和矿物效应基本上可可忽视。文章详细地讨论了元素之间谱线干扰、背景和脉冲高度选择。使用经验系数法校正基体效应,可准确测定钼精矿中的钼、硫、铁、铜、铅、锌等11个元素。在熔融片法主要讨论了元素谱线的选择及其相互之间的干扰。 相似文献