长链多不饱和脂肪酸甘油酯分析方法研究进展

本文综述了长链多不饱和脂肪酸甘油酯的分析方法研究进展,重点综述了其色谱分离和质谱鉴定方法的研究现状,并展望了长链多不饱和脂肪酸甘油酯分析方法的发展方向。     

柱色层族组成分离方法对葡萄籽中有机成分的分析

1引言 柱色层族组成分离法是有机地球化学学科自上个世纪30年代以来成功地分离混合有机质的一种重要方法。将此方法用于天然产物的分析，可以克服传统分析方法中的许多微组分由于被其主要组分覆盖而无法检测出来的不足，使天然产物中有机成分的分析系统和完整化。本实验以葡萄籽为样品，将常规分析方法和柱色层族组成分离方法进行分析比较。首先用常规分析方法，将葡萄籽抽提物酯化（BF3＋CH，OH）后直接GC／MSD分析，然后用柱色层族组成分离方法，将从样品中抽提出的混合有机物经过柱层析，用不同性质的洗脱剂对其进行族组成分离，依次分离为非极性、弱极性、极性3个馏分，再将这3个馏分分别GC／MSD进样分析，可以将抽提物中微组分系列化合物较理想地分离检测出来，得到葡萄籽中有机成分分布相对完整的信息。     

一种新型硝化抑制剂的毛细管电泳与电色谱分析比较

本研究采用毛细管电泳与电色谱两种方法,在优化分离条件下将3,5-二甲基吡唑新型硝化抑制剂与土壤样品中的其它成分进行分离。通过比较其检出限及标准工作曲线证明:两种方法定量准确度相近,但毛细管电色谱法在实际样品的分离中具有明显的优势,是进一步研究该新产品的较好的分离分析方法。     

锌合金标准物质中铅的测定

叙述了以沉淀分离—原子吸收法测定锌合金标准物质中铅的分析方法。实验结果证明,方法操作简便,数据准确可靠。     

硒的分析概况

对硒分析方法进行了综述,共分硒的分析分离方法,硒的定量法两大部分。硒的分析和分离方法中,介绍了硒的分析方法及分类,硒样品采集与前处理,分离方法。硒的定量法中介绍了重量法、容量法、分光光度法、荧光法、原子吸收分光光度法、原子发射光谱法、极谱法、中子活化分析法、气相色谱法、液相色谱法等。每一分析法中介绍了测定法研究及应用实例 。本文参考了137篇有关硒与硒分析法资料。     

毛细管电泳在手性化合物分离分析中的研究进展

手性化合物的对映异构体往往表现出不同的生理活性,因此建立手性化合物的有效分离分析方法具有重要意义。毛细管电泳（CE）是一种分离效率高、分析速度快、样品用量少、分离模式灵活多样的分离分析方法,在手性化合物的分离和检测领域应用广泛。该文主要综述了2017~2019年CE在手性分离分析方面的最新进展,并对其未来的发展趋势进行了展望。     

双羧基偶氮胂Ⅲ直接比色法测定合金钢中微量稀土元素

前言钢中微量稀土总量的测定方法,一般均需经分离操作,不能满足钢铁生产中快速分析的要求。为了寻找简便、快速的分析方法,我校曾研究用 EDTA-Zn 掩蔽铁的偶氮胂Ⅲ直接比色法,革除了分离操作。但方法仅适用于铸铁、碳钢及锰钢中稀土的测定,对合金钢就不适用。使方法的推广和应用,受到一定的限制。因此,进一步研究不经分离,既可直接测定普通钢,又能测定合金钢中稀土的快速分析方法,具有实际意     

锗的分析概况

本文是关于锗分析方法的综述，共分锗的分析和分离方法，锗的定量法和有机锗Ｇｅ－１３２产量质量控制法研究现状三大部分。锗的分析和分离方法中，介绍了锗的分析方法及分类，锗样品前处理、分离与预浓集的原理和方法，并便 出了有参考价值的图表，锗的定量法中介绍了重量法、容量法、分光光度法、荧光法和发光分析法原子吸收分光光度法、原子发射光法、电化学分析法。每一分析法中又介绍了测定法研究及应用实例。在测定法研究及应     

螯合吸附分离合金钢中的痕量轻稀土元素

近年来测定钢中0.0005％级稀土的方法已有报道,但其准确度不佳。一般要借助于溶剂萃取等富集分离技术才能达到预定目的。我们利用金属离子与有机试剂形成有色络合物,同时可被活性炭强烈吸附的特性,研究了合金钢中轻稀土的分离、它集方法,在确定的分离条件下,建立了痕量轻稀土的分析方法。     

分离分析技术在蛋白质组学研究中应用的新进展

蛋白质组学研究的核心技术之一是分离分析方法。该综述重点评述了分离分析技术在蛋白质组学研究,即在蛋白质组表达谱构建、翻译后修饰蛋白质组研究、蛋白质复合体和相互作用研究、蛋白质组定量研究中应用的新进展,介绍了各种分离分析方法的优点、应用范围和有待解决的问题。引用文献89篇。     

Large-scale separation of metallic and semiconducting single-walled carbon nanotubes

In the applications of single-walled carbon nanotubes (SWNTs), it is extremely important to separate semiconducting and metallic SWNTs. Although several methods have been reported for the separation, only low yields have been achieved at great expense. We show a separation method involving a dispersion-centrifugation process in a tetrahydrofuran solution of amine, which makes metallic SWNTs highly concentrated to 87% in a simple way.     

Redox substoichiometry in isotope dilution analysis

Isotope dilution analysis using the redox substoichiometric principle has been applied to the determination of antimony content in metallic zinc. As the substoichiometric reaction, the oxidation of trivalent to pentavalent antimony with potassium permanganate was used, followed by separation of these species by the BPHA extraction of trivalent antimony. Determination of antimony contents less than 0.5 μg was found to be possible with good accuracy, without separation of zinc ions. The antimony content in metallic zinc was determined to be 19.7±0.8 ppm, in good agreement with the results obtained by the other analytical methods.     

Separated metallic and semiconducting single-walled carbon nanotubes: opportunities in transparent electrodes and beyond

Ever since the discovery of single-walled carbon nanotubes (SWNTs), there have been many reports and predictions on their superior properties for use in a wide variety of potential applications. However, an SWNT is either metallic or semiconducting; these properties are distinctively different in electrical conductivity and many other aspects. The available bulk-production methods generally yield mixtures of metallic and semiconducting SWNTs, despite continuing efforts in metallicity-selective nanotube growth. Presented here are significant advances and major achievements in the development of postproduction separation methods, which are now capable of harvesting separated metallic and semiconducting SWNTs from different production sources with sufficiently high enrichment and quantities for satisfying at least the needs in research and technological explorations. Opportunities and some available examples for the use of metallic SWNTs in transparent electrodes and semiconducting SWNTs in various device nanotechnologies are highlighted and discussed.     

用于渗透气化法分离水—乙醇混合物的含离子膜

合成了乙烯醇和顺丁烯二酸的交替共聚物,并制成膜,使其与BaCl_2,CaCl_2,SrCl_2及CuSO_4的水溶液反应。将反应产物—含离子聚合物膜用于渗透气化法分离乙醇-水混合物。结果表明,离子膜在渗透速率及分离系数两方面均好于纯聚合物膜。在以上四种离子膜中,含Ba~(2 )离子膜的性能最好,这表明Ba~(2 )离子不仅使膜更加亲水,增加了对水的溶解度,而且由于Ba~(2 )离子引起聚合物分子链间的交联,而使膜变得更加致密,从而提高了膜的分离系数。     

Electrophoretic methods for separation of nanoparticles

This article reviews progress in the application of electrophoretic techniques for the separation of nanoparticles. Numerous types of nanoparticles have recently been synthesised and integrated into different products and procedures. Consequently, analytical methods for the efficient characterisation of nanoparticles are now required. Several studies have revealed that gel electrophoresis can readily be used for separating nanoparticles according to their size or shape. However, many other studies focused on separation of nanoparticles by CE. In some cases nanoparticles could be separated by CZE, simply using pure buffer as the BGE. In other studies, buffer additives (most often SDS) were used, enabling fast separations of metallic nanoparticles by size. Other CE methods also allowed for separation of nanoparticle conjugates with biomolecules. Dielectrophoresis is yet another electrophoretic technique useful in separation and characterisation of nanoparticles; particularly nanotubes. Detection methods often used after electrophoretic separation include UV/Vis absorption and fluorescence spectroscopy. Examples of recent and relevant older reports are presented here. The authors conclude that electrophoretic methods for nanoanalysis can provide inexpensive and efficient tools for quality assurance and safety control; and as a consequence, they can augment transfer of nanotechnologies from research to industry.     

Separation and/or selective enrichment of single-walled carbon nanotubes based on their electronic properties

Single-walled carbon nanotubes (SWNTs) possess unique electronic properties that make them very promising materials for use in both nano-electronics and thin film devices. However, SWNTs are always produced as a mixture of metallic and semiconducting nanotubes, which is a major roadblock to their widespread application. This tutorial review provides a brief summary of ways of separating single-walled carbon nanotubes into metallic and semiconducting fractions. Various methods including selective growth, selective removal, selective adsorption and band structure modulation--all of which aim to produce pure SWNTs with well-defined electronic properties--are systematically discussed. The main problems in this field, the outlook for separation techniques and some views of future developments are presented.     

某些氰基甲(月无无日)类试剂与表面活性剂的作用机理

本文研究了表面活性剂对1,5-二(2-羟基-5-氯苯基)-3-氰基甲(月朁)(HCPCF)及1,5-二(2-羟基-5-磺基苯基)-3-氰基甲(月朁)(HSPCF)以及其金属络合物吸收光谱的影响;通过对电泳、析相等现象的分析,探讨了HCPCF、HSPCF及其相应络合物反应行为的差别;讨论了胶束对络合反应速度的影响。     

手性化合物的萃取分离研究进展

综述手性化合物的萃取分离方法,包括亲合萃取分离、配位萃取分离、形成非对映体立体异构体萃取分离、离子交换反应萃取分离、反相胶团萃取分离以及膜萃取分离。中性氨基酸的萃取分离将会成为研究的热点。     

微量锌的分离与富集

就近年来国内外富集分离微量锌的方法进行了综述，着重介绍常用的萃取法、液膜分离法、浮选分离法、树脂分离法、泡沫塑料富集分离法。     

Neue Hochfrequenzmeßverfahren für die chemische Analytik

New high-frequency methods with transistorized and integrated curcuits are developed for measuring conductivity and dielectric behaviour of liquids, liquid mixtures and suspended matter. Cells “without electrodes” and cells of Kohlrausch-type are used as elements of the measuring circuits. Changes of the reaction medium always cause changes of electrical properties and influence the measuring results. The application of the methods to reaction kinetics measurements is not limited to solutions which are good conductors, but may also be successfully applied to non-conducting systems, or even to systems with metallic conduction. The methods in question are characterized by great measuring accuracy. The examples of application are regarded to the disintegration of KCl in solutions, to the dependence of conductivity of KCl-solutions on temperature, to precipitation titrations, and to the separation of phenol-water mixtures.