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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 294 (1979), S. 352-355 
    ISSN: 1618-2650
    Keywords: Best. von Cadmium, Zink ; Amperometrische Titration ; ÄGTA, Kohlepasteelektrode
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Cadmium and zinc can be determined in a single titration in the following manner: To the sample solution an ammonia/ammoniumchloride buffer is added to make the ammonia concentration 1,0–1,2 M (pH ca. 10). The titration is performed with amperometric indication using a carbon paste electrode and EGTA [ethyleneglycol-bis-(2-aminoethylether)-tetra acetic acid] as the titrant. After the end point for cadmium, excess amount of calcium-EDTA complex is added, and zinc is successively titrated with EGTA. The influences of iron(III), copper(II), lead(II) and manganese(II) have been examined. The conditions for carbon paste electrode indication have also been studied.
    Notes: Zusammenfassung Cadmium und Zink können in einer einzigen Titration folgendermaßen bestimmt werden: Zu der Probelösung wird Ammoniak-Ammoniumchlorid-Puffer zugesetzt. Die Ammoniakkonzentration in der Endlösung sollte 1,0–1,2 M (pH ca. 10) betragen. Die Titration erfolgt mit ÄGTA [Äthylenglycolbis-(2-Aminoäthyläther)-tetraessigsäure] und wird amperometrisch mit der Kohlepasteelektrode indiziert. Nach dem Endpunkt für Cadmium wird ein Überschuß an CaÄDTA zugesetzt. Danach wird auch Zink mit ÄGTA titriert. Die Störungen durch Fe(III), Cu(II), Pb(II) und Mn(II) werden untersucht. Ebenso werden die Bedingungen für die Indikation mit der Kohlepasteelektrode untersucht.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 13 (1989), S. 171-178 
    ISSN: 1434-6079
    Keywords: 35.20.V ; 35.20.W ; 36.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Distinct temperature effects could be observed in the threshold regions of photoionisation efficiency (PIE) measurements of sodium clusters. Simulations of the PIE thresholds at various temperatures were carried out with a simple, semiclassical model. Fitting the simulations to the experimental data allows to correct ionisation potential assignments for thermal effects and estimate internal temperatures of polyatomic sodium clusters.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-6079
    Keywords: 35.20.V ; 35.20.W ; 36.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent mass spectroscopic studies of continuous cluster beams resulting from supersonic expansions of alkali metal vapor have led to the postulation of islands of enhanced thermodynamic stability among the clusters produced. We discuss the various assumptions being made in converting ion abundances measured in these mass spectra into information about neutral stabilities. In this connection a number of experiments are described which allow insight into unimolecular dissociation of alkali cluster ions and into neutral cluster growth.
    Type of Medium: Electronic Resource
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