Dosage polarographique des résidus d'acétate de triphénylétain (Bresten) sur les légumes

✍ Scribed by J. Vogel; J. Deshusses

• Publisher: John Wiley and Sons
• Year: 1964
• Tongue: German
• Weight: 338 KB
• Volume: 47
• Category: Article
• ISSN: 0018-019X
• DOI: 10.1002/hlca.19640470124

✦ Synopsis

of iron atoms from many oxide crystals already at a temperature of approximately 300°C. The iron crystals sinter together to form irregular secondary particles. -Responsible for the pyrophorous behaviour is the specific surface. Self-ignition occurs when this surface is greater than approximately 3 m2/g. Pyrophorous iron can be inactivated with a mixture of N, low in 0,, an oxide layer being formed approximately 13 A, i. e. ca. 6 02--layers, thick. An estimation of the heat produced on forming this layer and of the resulting temperature increase leads to a value which is in agreement with the ignition temperature of inactivated iron powder with a specific surface of approx. 3 m2/g. Universitat Bern, Institut fur anorganische, analytische und physikalische Chemie, und Laboratorium fur Elektronenmikroskopie