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  • 1
    Electronic Resource
    Electronic Resource
    Atomic absorption spectroscopic investigation of the mineral fraction of pectins obtained from pumpkin and sugar beet (1997)
    Springer
    Monatshefte für Chemie 128 (1997), S. 211-216 
    Details
    ISSN: 1434-4475
    Keywords: Mineral composition ; Heavy metals ; Pectin ; Pumpkin ; Sugar beet ; Atomic absorption spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Zusammensetzung des mineralischen Anteils von Carboxypolysacchariden (Pektinen), die mittels eines biotechnologischen Prozesses (enzymatische Extraktion; “Biopektin”) bzw. der üblichen Methode (Behandlung mit Säure) aus den Zellwänden von Pflanzen (Kürbis, Zuckerrübe) gewonnen wurden, wird diskutiert. Die Ergebnisse wurden mittels Flammenatomabsorptionsspektroskopie (FAAS) oder im Graphitofen (GFAAS) bestimmt und beinhalten Spurenanalysen des Schwermetallgehalts. Es wird gezeigt, daß Biopektin einen unüblich hohen Mineralanteil aufweist, der hauptsächlich auf den hohen Gehalt an Ca und Mg zurückzuführen ist. Der Gehalt an einer Reihe von Alkali-, Erdalkali- und Schwermetallen wird verglichen und zur Isolationsmethode der Pektine in Beziehung gesetzt.
    Notes: Summary Data on the mineral composition of plant cell wall carboxypolysaccharides (pectins), obtained from non-traditional vegetable sources (pumpkin and sugar beet) using a biotechnological process of enzymatic extraction (biopectin) and the traditional method of acid treatment, are presented. The results have been obtained by flame (FAAS) or graphite furnace atomic absorption spectroscopy (GFAAS) and include trace analyses of the heavy metal content. It is shown that biopectin has an unusually high total mineral content, due mainly to markedly increased contents of Ca and Mg. The content of a series of alkaline, alkaline earth, and heavy metals in the pectins is compared considering the effect of the extraction method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807886
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  • 2
    Electronic Resource
    Electronic Resource
    Application of transmission Mössbauer effect spectroscopy to the study of electrocatalysis and adsorption phenomena at the nickel hydroxide electrode (1992)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 19 (1992), S. 577-580 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Mössbauer parameters for ferric hydroxo forms in alkaline matrices, ferric oxyhydroxide and its admixture at the nickel hydroxide electrode surface as well as for ferric hydroxo species absorbed at nickel hydroxides from strongly alkaline solutions have been compared. The feasibility of transmission Mössbauer spectra acquisition for the adsorbed species in the presence of dissolved forms (e.g. in situ) is based on the principle that the latter give no Mössbauer effect at room temperature owing to their diffusional mobility, while the former, being fixed at the adsorbent surface, have been shown to exhibit a sufficient resonant absorption. The effects of adsorption and water have been noted. Some questions connected with anodic oxygen evolution electrocatalysis by iron species involved in the anodic process at the nickel hydroxide electrode are also discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.7401901107
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  • 3
    Electronic Resource
    Electronic Resource
    Application of transmission Mössbauer spectroscopy to the surface study of Ni(II)-Fe(III) hydroxide electrocatalysts: Comparison with AES data (1993)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 20 (1993), S. 949-954 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Transmission Móssbauer spectra of binary coprecipitated nickel(II)-iron(III) hydroxides (molar ratios 9:1 and 4:1) are analysed and compared with the results of AES analyses of their surface composition. A correlation between the data of the above techniques has been noted, indicating a redistribution of the components (i.e. Ni and Fe) in the surface layers, the latter being enriched with iron(III) as compared to the bulk. The results obtained are in good agreement with an excellent electrocatalytic activity of composite Ni-Fe hydroxide systems towards anodic oxygen evolution in alkaline electrolytes, taking into account a distinctly exhibited ‘surface’ electrocatalytic effect of ferric species on the nickel hydroxide electrode in the anodic oxygen evolution process revealed previously. Transmission Móssbauer spectroscopy has been shown to be a highly effective probe sensitive both to various bulk and surface effects related to the solid phases studied.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740201204
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