分析化学过去、现在和展望

作者首先叙述了分析化学的源起,认为这门科学与人类文明文化,如青铜、黄铜冶炼、酿酒等大有关系。继出现东、西方的丹金术、欧洲中世纪的大试金术。后者可称为现代分析化学的前驱。适十七八世纪现代化学之兴起,分析化学起了主要作用。嗣后重量法、容量法、比色法、分光光度法、发射光谱法、极谱法、质谱法、层析法等等相继出现。这些方法可分为两大类——即化学法和仪器法。二者各有其优缺点;需要相辅相成,而决不是对立、排挤。另一方面,常量法之后又出现微量法和痕量分析。最后为分析化学在我国健康成长提出一些看法和意见。     

From Environmental Analytical Chemistry to Ecotoxicology—A Plea for More Concepts and Less Monitoring and Testing

The development of cultural and technical civilization has been marked with increasing interference in hydrogeochemical cycles and the production of a growing number of chemicals; this is accompanied by a growing concern on the potential adverse effects of chemicals on biological systems. Assessment of the potential toxicological and ecological effects of pollutants is of central importance. We are of the opinion that this cannot be accomplished by merely evaluating the harmfulness of a substance on the basis of toxicity tests with individual organisms and by monitoring analytically the environment for pollutants. We would like to encourage chemists to participate in the solution of ecotoxicological problems: chemodynamical concepts permit the estimation-on the basis of physical-chemical generalizations and with the help of compound-specific data-of the fate, the distribution, the potential for bioaccumulation in the food chain, and the approximate residence time of pollutants (and thus the attainable residual concentrations) in the environment and therefore to predict the relative risk of different pollutants.     

Resonance Raman Spectroscopy,and Its Application to Inorganic Chemistry. New Analytical Methods (27)

Resonance Raman spectra are obtained when the wave number of the exciting radiation is close to, or coincident with, that of an electronic transition of the scattering species. Such spectra are usually characterized by a very large enhancement of the intensities of particular Raman bands, sometimes with the appearance of intense overtone and combination tone progressions. The technique provides detailed information about excited electronic states because it is only the vibrational modes associated with the chromophore that are resonance-Raman active. Additionally, the high sensitivity is such that compounds at concentrations as low as 10^?6 mol/L may be detected, enabling resonance Raman spectroscopy to be used as an analytical tool and for the study of chromophores in molecules of biological interest.     

量子化学在分析试剂反应性能中的应用

本文对量子化学方法应用于分析化学的有机显色反应能作一综述，重点从量子化学在生色理论，在试剂络合性能研究中，在试剂质子化及其酸碱平衡和存在形成研究中以及在取代基效应的中的应用四个方面进行了论述，重点介绍我国在这一方面的工作。认为用量子化学方法预测试剂和络合物的某些性质成为可能。参考文献６０篇。     

Oil Decontamination of Bottom Sediments: Past,Present and Future

Experimental trial and manufacturing application of technologies and devices for purification of water bodies from oil and petroleum products are developed at the premises of Biological Institute of National Research Tomsk State University. More attention is paid to treatment of bottom sediments from oil and petroleum products. As a result of oil contamination, bottom sediments of some water bodies are covered with continuous layer of oil, and water bodies have lost their commercial fishing importance. In 2004-2006 for the first time scientists of National Research Tomsk State University and scientific technical association “Priborservice” conducted experimental trial of treatment bottom sediments technologies from oil on the arctic water bodies of Komi Republic and flood bypass conduits of Yugra (Khanty-Mansi Autonomous Area) to obtain unique results of experimental tests of technologies and equipment.     

The Construction of New Proteins and Enzymes-a Prospect for the Future?

Only a vanishingly small proportion of the almost infinite number of possible proteins occur in nature. Can this remaining potential of structural and functional diversity be used in the construction of new proteins? Is a “second evolution” of proteins and enzymes about to occur? These questions have suddenly become of interest because the recombinant DNA technique allows the synthesis of any given amino acid sequence. Examples of enzyme models demonstrate clearly that the unusual catalytic properties of enzymes are associated with the presence of a specifically folded polypeptide chain which has a complex three-dimensional form. The critical hurdle in the path of artificial proteins is thus the design of amino acid sequences which are able to fold into tertiary structures. — Recent studies on the topology and the mechanism of folding have provided considerable insight into the occurrence of, and the rules governing the three-dimensional architecture of proteins. Secondary structures apparently play a key role in the folding process; helices and “β-structures” act as nucleation centers directing folding and account for the surprisingly small number of different folding topologies. The problem of secondary structure formation can be investigated directly by means of conformational studies on model peptides. Oligopeptides with tailormade physicochemical, structural and conformational properties can already be designed. The theoretical and experimental basis for the construction of polypeptides with stable tertiary structures is therefore established. The path to macromolecules with an immense variety of novel properties lays before us.     

Aspects of the Past and Present, and Future Prospects for INAA Software: Achieving the Ultimate

The germanium semiconductor detector revolutionized NAA in the late sixties. Software was used from early on to analyze the spectra obtained and compute the concentrations. Since then, our understanding of the physics playing a part has improved, and desktop computing power has increased enormously. Highly accurate nuclear data, procedures and algorithms have become available. However, the software available for gamma-ray spectrometry, in general, and INAA specifically has not changed essentially since the early 1970s. In this paper, a brief overview of the history of such software is given, current developments enumerated and the ultimate, not-yet-existing software for gamma-ray spectrometry and INAA is sketched.     

Interplay of thermochemistry and Structural Chemistry, the journal (volume 19, 2008) and the discipline

In the current review paper the content of the journal Structural Chemistry for the calendar year 2008 is related to thermochemistry. Papers are summarized and a thermochemical slant added. Often questions are asked and research topics suggested.     

Analytical study of the phenyl-2-pyridyl ketone azine-palladium system. Photometric determination of palladium

Phenyl-2-pyridyl ketone azine reacts with palladium(II) to produce a yellow 1:1 complex (λ_max = 425 nm, ? = 10.4 × 10³M^?1 cm^?1 in aqueous ethanolic solution) and a red-violet 3:1 complex (λ_max = 530?540 and 380?390 nm). The yellow complex in aqueous ethanolic solution has been used for the spectrophotometric determination of trace amounts of palladium. The method has been applied to the determination of palladium in some catalysts and one mineral.     

Analytical applications of picolinealdehyde salicyloylhydrazone: II. Extraction and spectrophotometric determination of vanadium(V)

Picolinealdehyde salicyloylhydrazone reacts with vanadium(V) to produce a yellow 1:1 complex (λ_max = 400 nm, ? = 2.17 × 10⁴ liters · mol^?1 cm^?1) in aqueous ethanolic solution. The yellow complex can be extracted into chlorobenzene (λ_max = 425 nm, ? = 2.16 × 10⁴ liters · mol^?1 cm^?1) and used for the spectrophotometric determination of trace amounts of vanadium. Interferences have been investigated. The method has been applied to the determination of vanadium in steel and in lead concentrates.