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An increase of the 2nd polarographic uranium(VI) wave has been observed in the presence of chlorate ions in HClO4–NaClO4, or HClO4–NaClO4–NaCl supporting electrolyte, resp. The polarographic measurements at different temperatures and at various perchloric acid concentrations show that this increase is due to a kinetic U(III)-U(IV) current. The activation parameters of the U(III)-U(IV) oxidation reaction with ClO3 have been calculated usingKautecky's method.The approximately 5fold increase of the 2nd polarographic wave allows the determination of small amounts of uranium (10–5–10–6 mole/l).

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Zusammenfassung Die Dampfdruckerniedrigung, die kondesierendes Argon bei 4,2° K auf Wasserstoff ausübt, wurde unter der Annahme, da die Stammfunktion desRaoultschen Gesetzes unter den herrschenden Bedingungen gültig ist, berechnet und mit Mewerten vonHengevoss undTrendelenburg verglichen. Aus der guten Übereinstimmung der Ergebnisse kann mit gro Wahrscheinlichkeit auf die Richtigkeit dieser Voraussetzungen geschlossen werden.  相似文献   

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Ohne ZusammenfassungMit 2 Abbildungen.  相似文献   

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A kinetic difference method based on Landolt-type reactions is described. The reaction is allowed to proceed simultaneously in two mixtures, one of which contains a known constant amount of the catalyst and the other the unknown amount. The catalyst can be determined by means of the difference between the two Landolt effects. The system hydrogen peroxide-iodide-ascorbic acid was used to determine molybdenum in the range 1–20 μg. Iodide was determined by its effect on the iodate-arsenite reaction in the range 1–30 μg. In both cases, the reactions were followed photometrically. Vanadium (0.1–3.0 μg) was determined by means of the bromate-iodide-ascorbic acid system, and copper (0.1–2 μg) by the peroxydisulphate-iodide-thiosulphate system, both reactions being followed potentiometrically.  相似文献   

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