Contribution a l'étude de l'oxyde de cadmium en milieu alcalin |
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Authors: | M Viltange |
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Institution: | (1) Laboratoire de Recherches Microanalytiques, Ecole Nationale Supérieure de Chimie, Paris, France |
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Abstract: | Résumé La thermogravimétrie et l'analyse thermique différentielle montrent que l'oxydation du cadmium à l'air est négligeable jusqu'à 400°, tandis qu'en présence de peroxyde de sodium de soude ou de peroxyde de baryum, elle est totale mais que l'agent oxydant est uniquement l'oxygène de l'air. Le calcul de la chaleur de réaction à partir de la mesure de l'air du pic d'ATD correspondant fait conclure à la seule formation de l'oxyde de cadmium, le pic de fusion étant utilisé comme référence.
Thermogravimetric and differential thermoanalytical investigations have shown that the oxidation of cadmium in air is negligible up to 400°. In the presence of sodium peroxide, barium peroxide or sodium hydroxide complete oxidation takes place, the aerial oxygen acting as the only oxidizing agent. The heat of reaction, calculated from the DTA peak area using the peak corresponding to the melting of the sample as reference, indicated that exclusively cadmium oxide was formed.
Zusammenfassung Thermogravimetrische und differentialthermoanalytische Untersuchungen zeigten, daß die Oxydation des Kadmiums in Luft bis zu 400° vernachlässigbar ist. In Gegenwart von Natriumperoxyd, Bariumperoxyd oder Natriumhydroxyd tritt vollständige Oxydation ein. Als Oxydationsmittel wirkt jedoch ausschließlich der Luftsauerstoff. Die aus der Messung der DTA Spitzenfläche erfolgte Berechnung der Reaktionswärme, wobei die dem Schmelzen entsprechende Spitze als Referenz diente, wies auf die alleinige Bildung von Kadmiumoxyd hin.
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