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S. Recknagel P. Brätter A. Tomiak U. Rösick 《Fresenius' Journal of Analytical Chemistry》1993,346(6-9):833-836
Summary An analytical procedure for the determination of Se, as well as of other trace elements of clinical interest, in undiluted blood serum samples is presented. This procedure allows the on-line wet ashing of the sample, the hydride generation and the determination of the SeH2 formed in one step. For this purpose, carrier solution and the injected sample (300 l) were merged with an acid stream (80% H2SO4, 12% HClO4, 8% HNO3) and passed through a reaction coil heated up to 240°C. To increase the dispersion, the wet digestion was carried out in an ultrasonic field. After trapping of the gas bubbles, 5 mol/l HCl and 0.053 mol/l NaBH4 solutions were added via T-junctions for Se-hydride generation. The nebulizing system of the ICP-OES was used as gas/liquid separator. The hydride was swept from the spray chamber into the plasma by an argon gas flow with droplets containing other sample constituents. This allows the simultaneous determination of other trace elements of clinical interest, for example Fe, Cu and Zn. The relative detection limit for Se in blood serum was 5 g/l. The quality of the developed procedure was verified in two ways: by measuring SRM Seronorm 116 and by comparing the results for different serum samples with the results obtained with ETAAS. Our results were in good agreement in both cases.Dedicated to Professor Dr. Wilhelm Fresenius on the occasion of his 80th birthday 相似文献
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Dr. Winfried Recknagel 《Monatshefte für Mathematik》1985,100(4):293-298
An equivalent form of the classical circle problem is the unproved conjecture (3)
. In this note the corresponding conjecture with
k
(.) (the 1-periodic Bernoulli polynomials of orderk2) instead of 1(.) is settled in an affirmative way (even with =0). Moreover, a generalized sum (6) is estimated by means of an analogue to a classical result due tovan der Corput. 相似文献
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W. Miehle O. Echt O. Kandler T. Leisner E. Recknagel 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1989,12(1-4):273-274
The superior stability of closed-shell icosahedral structures is evident from size distributions of argon, krypton and xenon cluster ions in the size range 100?n?1000. 相似文献
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Lattice defects in Al, Cu, Ag and Au were studied by the perturbed angular correlation technique (PAC) using the probe atom100Pd/100Rh. The comparison of data obtained on interstitial trapping in Cu and Au at different probe atoms (100pd,111In) allows defect characterisation less affected by the respective probe. The trapping efficiency of100Pd for vacancy like defects is quite different to that of111In atoms. 相似文献