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  • 1
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Traces of zinc and bismuth in small amounts of high purity tin (0.5 ∼ 25 mg) were determined by polarized Zeeman AAS with direct atomization of a solid sample in a electrothermal graphite-cup cuvette. Standard solutions of zinc and bismuth were employed for the calibration curve. Absorption intensities (peak areas of the absorption signals) for zinc and bismuth were not influenced by the residual tin in a graphite-cup cuvette, up to 25 mg for zinc and up to 10 mg for bismuth. The relative standard deviations of analytical results were 9 ∼ 43% for 0.002 ∼ 0.05 ppm of zinc and 5 ∼ 10 % for 0.06 ∼ 1.3 ppm of bismuth. Detection limits were 0.012 ng for zinc and 0.03ng for bismuth. These values correspond to 0.0005 ppm of zinc in 25 mg of tin and 0.03 ppm of bismuth in 10 mg of tin. Time (incl. weighing the sample) required for analyzing one sample was about 5 min.
    Notes: Zusammenfassung Spuren Zink (0,002 ∼ 0,05 ppm) und Bismut (0,06 ∼ 1,3 ppm) wurden in reinem Zinn mit polarisierter Zeeman-AAS bestimmt. Eine kleine Menge der Probe (0,5 ∼ 25 mg) in fester Form wurde direkt mit Hilfe einer elektrothermischen Graphit-Becherküvette atomisiert. Eichkurven von Zn und Bi wurden mit Standardlösungen aufgestellt. Sn in der Graphit-Becherküvette beeinflusst die Absorptionsintensität von Zn bis zu 25 mg und von Bi bis zu 10mg nicht. Die relative Standardabweichung betrug 9 ∼ 43% für 0,002 ∼ 0,05 ppm Zn und 5 ∼ 10% für 0,06 ∼ 1,3 ppm Bi, die Nachweisgrenzen 0,012 ng für Zn und 0,03ng für Bi. Diese Werte entsprechen 0,005 ppm Zn in 25 mg Sn und 0,03 ppm Bi in 10 mg Sn. Die Durchführung einer Analyse benötigt etwa 5 min.
    Type of Medium: Electronic Resource
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