The determination of hydrazobenzene by the die method with hydrogen peroxide catalyzed with vanadium |
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Authors: | F Trischler |
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Institution: | (1) Phys. Chem. Dept., Gedeon Richter Chem. Works, Budapest, Hungary |
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Abstract: | Hydrazobenzene cannot be oxidized to azobenzene with hydrogen peroxide in ethanol-containing medium. Vanadium(V) ions catalyze the oxidation; in their presence the reaction takes place rapidly. A thermometric (DIE) method was developed for the determination of hydrazobenzene, based on the oxidation reaction with hydrogen peroxide catalyzed by vanadium(V). The reaction is initiated by the addition of the solution of the catalyst, which is applied in small amount (100 l). Thus, the application of the immersion pipette is not necessary. The standard deviation of the determination is ±0.42 mg hydrazobenzene in 50 ml ethanol.
Zusammenfassung Hydrazobenzol kann in Äthanolhaltigem Medium mit Wasserstoffperoxid nicht zu Azobenzol oxidiert werden. Vanadium(V)-ionen katalysierten die Oxidation, in ihrer Gegenwart vollzieht sich die Reaktion rasch. Der Autor entwickelt eine thermometrische (DIE) Methode zur Bestimmung von Hydrazobenzol, die auf der durch Vanadium(V)-katalysierten Oxidationsreaktion mit Wasserstoffperoxid beruht. Die Reaktion wird durch Zugabe der in kleinen Mengen (100 1) angewandten Katalysatorlösung ausgelöst. Dadurch erübrigt sich der Einsatz von Immersionspipetten. Die Standardabweichung betrÄgt ± 0.42 mg Hydrazobenzol in 50 ml Äthanol.
Résumé L'hydrazobenzène ne peut pas Être oxydé par l'eau oxygénée dans un milieu contenant de l'éthanol. Les ions vanadium(V) catalysent l'oxydation et la réaction a Heu à grande vitesse en leur présence. Les auteurs ont développé une méthode thermométrique (DIE) afin d'effectuer le dosage de l'hydrazobenzène. Cette méthode repose sur la réaction d'oxydation par l'eau oxygénée en présence de vanadium(V) comme catalyseur. La réaction est initiée par addition de la solution du catalyseur utilisée en faible quantité (100 l). Ainsi, l'emploi d'une pipette d'immersion n'est pas nécessaire. L'écart-type du dosage est ±0.42 mg d'hydrazobenzène dans 50 ml d'éthanol.
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![Rcy](/content/j10p7663u5263p0u/xxlarge1056.gif) ![kcy](/content/j10p7663u5263p0u/xxlarge1082.gif) ![Acy](/content/j10p7663u5263p0u/xxlarge1040.gif) ![tcy](/content/j10p7663u5263p0u/xxlarge1090.gif) ![Acy](/content/j10p7663u5263p0u/xxlarge1040.gif) ![lcy](/content/j10p7663u5263p0u/xxlarge1083.gif) ![Icy](/content/j10p7663u5263p0u/xxlarge1048.gif) ![zhcy](/content/j10p7663u5263p0u/xxlarge1078.gif) ![tcy](/content/j10p7663u5263p0u/xxlarge1090.gif) ![Ocy](/content/j10p7663u5263p0u/xxlarge1054.gif) ![Rcy](/content/j10p7663u5263p0u/xxlarge1056.gif) . ![pcy](/content/j10p7663u5263p0u/xxlarge1087.gif) ![Rcy](/content/j10p7663u5263p0u/xxlarge1056.gif) ![Icy](/content/j10p7663u5263p0u/xxlarge1048.gif) ![Mcy](/content/j10p7663u5263p0u/xxlarge1052.gif) ![IEcy](/content/j10p7663u5263p0u/xxlarge1045.gif) ![Ncy](/content/j10p7663u5263p0u/xxlarge1053.gif) ![IEcy](/content/j10p7663u5263p0u/xxlarge1045.gif) ![Ncy](/content/j10p7663u5263p0u/xxlarge1053.gif) ![Icy](/content/j10p7663u5263p0u/xxlarge1048.gif) ![pcy](/content/j10p7663u5263p0u/xxlarge1087.gif) ![Ocy](/content/j10p7663u5263p0u/xxlarge1054.gif) ![gcy](/content/j10p7663u5263p0u/xxlarge1075.gif) ![Ucy](/content/j10p7663u5263p0u/xxlarge1059.gif) ![zhcy](/content/j10p7663u5263p0u/xxlarge1078.gif) ![Acy](/content/j10p7663u5263p0u/xxlarge1040.gif) ![Ucy](/content/j10p7663u5263p0u/xxlarge1059.gif) ![SHCHcy](/content/j10p7663u5263p0u/xxlarge1065.gif) ![IEcy](/content/j10p7663u5263p0u/xxlarge1045.gif) ![pcy](/content/j10p7663u5263p0u/xxlarge1087.gif) ![Icy](/content/j10p7663u5263p0u/xxlarge1048.gif) ![pcy](/content/j10p7663u5263p0u/xxlarge1087.gif) ![IEcy](/content/j10p7663u5263p0u/xxlarge1045.gif) ![tcy](/content/j10p7663u5263p0u/xxlarge1090.gif) ![kcy](/content/j10p7663u5263p0u/xxlarge1082.gif) ![Ncy](/content/j10p7663u5263p0u/xxlarge1053.gif) ![softcy](/content/j10p7663u5263p0u/xxlarge1100.gif) ![Vcy](/content/j10p7663u5263p0u/xxlarge1042.gif) ![lcy](/content/j10p7663u5263p0u/xxlarge1083.gif) ![softcy](/content/j10p7663u5263p0u/xxlarge1100.gif) ![IEcy](/content/j10p7663u5263p0u/xxlarge1045.gif) ![tcy](/content/j10p7663u5263p0u/xxlarge1090.gif) ![scy](/content/j10p7663u5263p0u/xxlarge1089.gif) ![IEcy](/content/j10p7663u5263p0u/xxlarge1045.gif) ![Ocy](/content/j10p7663u5263p0u/xxlarge1054.gif) ![Bcy](/content/j10p7663u5263p0u/xxlarge1041.gif) ![khcy](/content/j10p7663u5263p0u/xxlarge1093.gif) ![Ocy](/content/j10p7663u5263p0u/xxlarge1054.gif) ![Dcy](/content/j10p7663u5263p0u/xxlarge1044.gif) ![Icy](/content/j10p7663u5263p0u/xxlarge1048.gif) ![Mcy](/content/j10p7663u5263p0u/xxlarge1052.gif) ![ycy](/content/j10p7663u5263p0u/xxlarge1099.gif) . ![scy](/content/j10p7663u5263p0u/xxlarge1089.gif) ![tcy](/content/j10p7663u5263p0u/xxlarge1090.gif) ![Acy](/content/j10p7663u5263p0u/xxlarge1040.gif) ![Ncy](/content/j10p7663u5263p0u/xxlarge1053.gif) ![Dcy](/content/j10p7663u5263p0u/xxlarge1044.gif) ![Acy](/content/j10p7663u5263p0u/xxlarge1040.gif) ![Rcy](/content/j10p7663u5263p0u/xxlarge1056.gif) ![tcy](/content/j10p7663u5263p0u/xxlarge1090.gif) ![Ncy](/content/j10p7663u5263p0u/xxlarge1053.gif) ![Ocy](/content/j10p7663u5263p0u/xxlarge1054.gif) ![Ocy](/content/j10p7663u5263p0u/xxlarge1054.gif) ![tcy](/content/j10p7663u5263p0u/xxlarge1090.gif) ![kcy](/content/j10p7663u5263p0u/xxlarge1082.gif) ![lcy](/content/j10p7663u5263p0u/xxlarge1083.gif) ![Ocy](/content/j10p7663u5263p0u/xxlarge1054.gif) ![Ncy](/content/j10p7663u5263p0u/xxlarge1053.gif) ![Ncy](/content/j10p7663u5263p0u/xxlarge1053.gif) ![Icy](/content/j10p7663u5263p0u/xxlarge1048.gif) ![Ocy](/content/j10p7663u5263p0u/xxlarge1054.gif) ![pcy](/content/j10p7663u5263p0u/xxlarge1087.gif) ![Rcy](/content/j10p7663u5263p0u/xxlarge1056.gif) ![IEcy](/content/j10p7663u5263p0u/xxlarge1045.gif) ![Dcy](/content/j10p7663u5263p0u/xxlarge1044.gif) ![IEcy](/content/j10p7663u5263p0u/xxlarge1045.gif) ![lcy](/content/j10p7663u5263p0u/xxlarge1083.gif) ![IEcy](/content/j10p7663u5263p0u/xxlarge1045.gif) ![Ncy](/content/j10p7663u5263p0u/xxlarge1053.gif) ![Icy](/content/j10p7663u5263p0u/xxlarge1048.gif) ![gcy](/content/j10p7663u5263p0u/xxlarge1075.gif) ![Icy](/content/j10p7663u5263p0u/xxlarge1048.gif) ![Dcy](/content/j10p7663u5263p0u/xxlarge1044.gif) ![Acy](/content/j10p7663u5263p0u/xxlarge1040.gif) ![zhcy](/content/j10p7663u5263p0u/xxlarge1078.gif) ![Ocy](/content/j10p7663u5263p0u/xxlarge1054.gif) ![Bcy](/content/j10p7663u5263p0u/xxlarge1041.gif) ![IEcy](/content/j10p7663u5263p0u/xxlarge1045.gif) ![Ncy](/content/j10p7663u5263p0u/xxlarge1053.gif) ![zhcy](/content/j10p7663u5263p0u/xxlarge1078.gif) ![Ocy](/content/j10p7663u5263p0u/xxlarge1054.gif) ![lcy](/content/j10p7663u5263p0u/xxlarge1083.gif) ![scy](/content/j10p7663u5263p0u/xxlarge1089.gif) ![Ocy](/content/j10p7663u5263p0u/xxlarge1054.gif) ![scy](/content/j10p7663u5263p0u/xxlarge1089.gif) ![tcy](/content/j10p7663u5263p0u/xxlarge1090.gif) ![Acy](/content/j10p7663u5263p0u/xxlarge1040.gif) ![Vcy](/content/j10p7663u5263p0u/xxlarge1042.gif) ![lcy](/content/j10p7663u5263p0u/xxlarge1083.gif) ![softcy](/content/j10p7663u5263p0u/xxlarge1100.gif) ![IEcy](/content/j10p7663u5263p0u/xxlarge1045.gif) ±0.42 ![Mcy](/content/j10p7663u5263p0u/xxlarge1052.gif) 50 ![Mcy](/content/j10p7663u5263p0u/xxlarge1052.gif) ![IOcy](/content/j10p7663u5263p0u/xxlarge1025.gif) ![tcy](/content/j10p7663u5263p0u/xxlarge1090.gif) ![Acy](/content/j10p7663u5263p0u/xxlarge1040.gif) ![Ncy](/content/j10p7663u5263p0u/xxlarge1053.gif) ![Ocy](/content/j10p7663u5263p0u/xxlarge1054.gif) ![lcy](/content/j10p7663u5263p0u/xxlarge1083.gif) .
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