ISSN:
1618-2650
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Summary The preliminary partial factorial design (orthogonal test) and modified simplex optimization as well as univariate method were used to investigate the effects of small amounts of hydrogen added to three gas flows of an argon plasma on the signal and background intensities as well as their ratios for fourteen elements. According to the behaviour in such a plasma these fourteen elements can be divided into five groups. By the addition of hydrogen signal and background intensities were increased. The signal-tobackground ratio is not the only criterion to judge the performance of a plasma. Comparing with the pure argon plasma, also the signal-to-background ratios of all elements except for Ca and Mg decreased under the optimum parameters for Ca which was the extreme case in this study. The detection limits of Fe, Cd, Cr, V, Ni and Be were improved due to the increased signal intensity and more stable plasma. Ca can easily be used as an indicator to judge the performance of an argon-hydrogen plasma especially in the determination of heavy metals. Altogether, the behaviour of the following elements was studied: Al, Be, Ca, Cd, Cr, Cu, Fe, Mg, Mn, Ni, Pb, Ti, V, Zn.
Notes:
Zusammenfassung Der Orthogonal-Test und eine modifizierte Simplex-Optimierung wurden verwendet, um den Einfluß kleiner Mengen von Wasserstoff in den 3 Gasströmen einer ICP-Anregungseinheit (Kühl-, Plasma- und Aerosolträgergas) zu bestimmen und optimale Betriebsbedingungen zu erarbeiten. 14 Elemente (Al, Be, Ca, Cd, Cr, Cu, Fe, Mg, Mn, Ni, Pb, Ti, V, Zn) wurden in einem Simultanspektrometer in diese Untersuchung einbezogen. Ein unterschiedliches Verhalten der verschiedenen Elemente auf die H2-Zumischung wird gezeigt. Das Signal/ Untergrund-Verhältnis (S/B) ist nicht als universelles Kriterium für das Plasma anzusehen, da trotz schlechterem S/B signifikant bessere Nachweisgrenzen auf Grund stabilerer Plasmaeigenschaften durch die H2-Zumischung erreicht werden können.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00487264
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