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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 412 (1975), S. 184-192 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Effect of Temperature and Presence of Foreign Ions on the Kinetics and Mechanism of the Goethite Formation in Liquid PhaseWe studied the influence of temperature and addition of some foreign ions on the kinetics of transformation of the goethite in sulfate medium by slow air bubbling. The temperature up to 70°C does not influence the kinetics of oxidation; this proves that the transfer of oxygen taken place through the liquid phase.Manganese and colbalt cations impede the formation and the growth of αFeOOH crystallites. Citrate and phosphate anions both hinder this transformation.
    Notes: Ce travail est consacré à l'étude de l'influence de la température et de l'addition des ions étrangers sur la cinétique de formation de la goethite en milieu acide par aération. La température jusqu' à 70°C n'influence pas la cinétique de cette oxydation, ce qui prouve que le transfert d'oxygène se fait par la phase liquide.Les cations manganèse et cobalt ralentissent la formation et la croissance de αFeOOH. Les anions citrate et phosphate qui augmentent la solubilité du fer(III) en solution sont défavorables à la transformation de l'hydroxyde de fer(II) en goethite.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Study of the Elementary Process which Determines the Kinetic Exchange of Iron in Green Rust II, at Room Temperature and in Oxygen-free ConditionsUtilisation of Fe 59 isotope has shown that the elementary process which determines the kinetic exchange of Fe3+ in the green rust II at room temperature and in oxygen free conditions is an autodiffusion phenomenon of Fe in the solid.The value of the autodiffusion coefficient is included between 1.2 and 3.5 · 10-17 cm2 sec-1 for 4 · 10-6 cm thick particles of green rust II.
    Notes: L'utilisation de l'isotope 59 du fer a permis de mettre en évidence que le processus élémentaire le plus lent qui détermine la cinétique d'échange du Fe3+ dans le green rust II à la température ordinaire et en l'absence d'oxygène est un phénomène d'autodiffusion du fer dans le solide. Le coefficient d'autodiffusion est compris entre 1,2 et 3,5 · 10-17 cm2 sec-1 pour des plaquettes de green rust II de 4 · 10-6 cm d'épaisseur.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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