Micellar catalysis by perfluorooctanoic acid

Rates of acidic hydrolysis of hexano-, octano-, and decanohydroxamic acids and of 4-bromophenylaceto- and phenylacetohydroxamic acids have been determined in aqueous perfluorooctanoic acid—a reactive counterion surfactant system. Typical micellar catalysis was observed for the hydrolyses of the n-alkyl hydroxamic acids but not for the arylacetohydroxamic acids. The Arrhenius activation energy for hydrolysis of octano-hydroxamic acid is smaller above the cmc of the surfactant than it is below the cmc.     

Eine Mikromethode der Flammen-Atomabsorptions- und Emissionsspektrometrie (Platinschlaufen-Methode)—III: Verbesserung der analytischen Aussage durch zeitliche Auflösung der Impulssignale

By the application of storage oscillograph or a transient recorder in combination with a common chart recorder, the transient signals obtained with the loop method were time-resolved. This approach permitted a better analysis and interpretation of the phenomena, and allowed the statement of operating conditions that yield improved analytical performance including the power of detection. From the shape of the signal, conclusions could be drawn regarding the uniformity of the sample evaporation and the formation of compounds with differing evaporation behaviour.     

Ansatz zur simultanen Bestimmung von Na, K, Mg, Ca, Li, Fe, Cu und Zn in Humanserum mit einem Gleichstromplasma

Ohne Zusammenfassung

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Simultaneous determination of Na, K, Mg, Ca, Li, Fe, Cu and Zn in human serum using a direct current plasma

     

K-vacancy formation in deep inelastic nuclear reactions

We investigate the dependence of inner shell vacancy production on interaction time T in deep inelastic nuclear reactions. Coupled channel calculations for Xe-Pb, Pb-Pb, and U-U collisions are presented. In the heaviest system strong interference minima for both 1sσ and 2p^1/2σ excitation are predicted at T?3.10^?21 sec.