Differenzspektroskopische und pulspolarographische untersuchungen zur zusammensetzung der kupfer-alizarin s-komplexe

From differential spectrophotometric, conductometric and pulse polarographic data, three copper-Alizarin S complexes (with compositions 1:2, 1:1 and 2:1) can be identified. The copper-rich 2:1-compound can be precipitated from aqueous solution. In dimethylformamide/water solutions the copper in the 1:1-complex is bound in the peri-position.     

Die selektive Bestimmung von Nickelionen

Ohne Zusammenfassung     

Die Entionisierung von Elektrolyten durch Elektrolyse an Ionenaustauscher-membranen und die selektive Anionentrennung

Ohne Zusammenfassung     

Pyridin-2-azo-p-dimethylanilin

Ohne Zusammenfassung     

Weak descartes systems in generalized spline spaces

A class of generalized spline spaces is introduced for which a basis of functions with local support is constructed by using a recursion relation. It is shown that this basis forms a weak Descartes system. Moreover, an interpolation property is given.     

Eine spektralphotometrische Titration von Niob mittels ?DTA

Ohne Zusammenfassung     

Examinations regarding the correctness of quantitative surface analysis using SNMS

Summary For the assessment of the correctness of depth profile analyses with non-ideal technical metal surfaces using secondary neutral particle mass spectrometry (SNMS), the roughness of the sample surface was examined for the transition width of the signal. It is shown that with elements with low sputter rates (Al Mn), similar to that of the substrate element (Fe), there is no significant influence of the roughness. However, clear dependencies are observed for tin and zinc, elements with high sputter rates. Whereas tin gave acceptable results when the roughness was significant, cone formation was observed with zinc which caused abnormal sputter behaviour. The use of high-frequency sputter processes eliminates this cone formation and leads to constant signals, even with thick zinc layers. This method is therefore not only suitable for use with non-conductors, as originally planned, but also offers considerable advantages in the analysis of metal coatings.     

Die anodisch angeregte kationische Polymerisation von Isobutylvinyläther

At low current intensities with tetraethylammonium perchlorate as supporting electrolyte a stationary cationic polymerization of isobutyl vinyl ether in an acetonitrile-diisopropyl ether solvent is obtained at the platinum anode. The electrochemical and kinetic characteristics of the system are determined. An influence of water is found. The molecular weight of the polymer is mainly given by chain transfer to the monomer.

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