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  • 1 Technische Hochschule Graz Institut für allgemeine Chemie, Mikro- und Radiochemie Österreich
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A new analytical method using metallic silver (110mAg) as radioreagent is reported. A known amount of excess oxidant is applied to the reducing agent which is to be determined. After the reaction has taken place, the excess of the oxidizing agent is reacted with the neutron-activated silver whereby110mAg ions are released. The count rate of the solution is proportional to the excess of the oxidant, thus it is possible to determine the original content of the reducing agent in question. The proposed redox procedure based on back measurements has been applied to determinations of hydrogen peroxide, sodium oxalate, potassium ferrocyanide(II), uranium(IV), as well as hydroquinone and ethanol in the μg range. The method makes use of calibration curves; the standard deviation is ±2% on the average. Necessary heights of the normal potentials of the involved systems, favourable reaction conditions, and kineticsa are discussed.